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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [4.1.0] - 2021-04-15
+### Added
+- Types are now exported as `yaml.types.XXX`.
+- Every type now has `options` property with original arguments kept as they were
+  (see `yaml.types.int.options` as an example).
+
+### Changed
+- `Schema.extend()` now keeps old type order in case of conflicts
+  (e.g. Schema.extend([ a, b, c ]).extend([ b, a, d ]) is now ordered as `abcd` instead of `cbad`).
+
+
+## [4.0.0] - 2021-01-03
+### Changed
+- Check [migration guide](migrate_v3_to_v4.md) to see details for all breaking changes.
+- Breaking: "unsafe" tags `!!js/function`, `!!js/regexp`, `!!js/undefined` are
+  moved to [js-yaml-js-types](https://github.com/nodeca/js-yaml-js-types) package.
+- Breaking: removed `safe*` functions. Use `load`, `loadAll`, `dump`
+  instead which are all now safe by default.
+- `yaml.DEFAULT_SAFE_SCHEMA` and `yaml.DEFAULT_FULL_SCHEMA` are removed, use
+  `yaml.DEFAULT_SCHEMA` instead.
+- `yaml.Schema.create(schema, tags)` is removed, use `schema.extend(tags)` instead.
+- `!!binary` now always mapped to `Uint8Array` on load.
+- Reduced nesting of `/lib` folder.
+- Parse numbers according to YAML 1.2 instead of YAML 1.1 (`01234` is now decimal,
+  `0o1234` is octal, `1:23` is parsed as string instead of base60).
+- `dump()` no longer quotes `:`, `[`, `]`, `(`, `)` except when necessary, #470, #557.
+- Line and column in exceptions are now formatted as `(X:Y)` instead of
+  `at line X, column Y` (also present in compact format), #332.
+- Code snippet created in exceptions now contains multiple lines with line numbers.
+- `dump()` now serializes `undefined` as `null` in collections and removes keys with
+  `undefined` in mappings, #571.
+- `dump()` with `skipInvalid=true` now serializes invalid items in collections as null.
+- Custom tags starting with `!` are now dumped as `!tag` instead of `!<!tag>`, #576.
+- Custom tags starting with `tag:yaml.org,2002:` are now shorthanded using `!!`, #258.
+
+### Added
+- Added `.mjs` (es modules) support.
+- Added `quotingType` and `forceQuotes` options for dumper to configure
+  string literal style, #290, #529.
+- Added `styles: { '!!null': 'empty' }` option for dumper
+  (serializes `{ foo: null }` as "`foo: `"), #570.
+- Added `replacer` option (similar to option in JSON.stringify), #339.
+- Custom `Tag` can now handle all tags or multiple tags with the same prefix, #385.
+
+### Fixed
+- Astral characters are no longer encoded by `dump()`, #587.
+- "duplicate mapping key" exception now points at the correct column, #452.
+- Extra commas in flow collections (e.g. `[foo,,bar]`) now throw an exception
+  instead of producing null, #321.
+- `__proto__` key no longer overrides object prototype, #164.
+- Removed `bower.json`.
+- Tags are now url-decoded in `load()` and url-encoded in `dump()`
+  (previously usage of custom non-ascii tags may have led to invalid YAML that can't be parsed).
+- Anchors now work correctly with empty nodes, #301.
+- Fix incorrect parsing of invalid block mapping syntax, #418.
+- Throw an error if block sequence/mapping indent contains a tab, #80.
+
+
+## [3.14.1] - 2020-12-07
+### Security
+- Fix possible code execution in (already unsafe) `.load()` (in &anchor).
+
+
+## [3.14.0] - 2020-05-22
+### Changed
+- Support `safe/loadAll(input, options)` variant of call.
+- CI: drop outdated nodejs versions.
+- Dev deps bump.
+
+### Fixed
+- Quote `=` in plain scalars #519.
+- Check the node type for `!<?>` tag in case user manually specifies it.
+- Verify that there are no null-bytes in input.
+- Fix wrong quote position when writing condensed flow, #526.
+
+
+## [3.13.1] - 2019-04-05
+### Security
+- Fix possible code execution in (already unsafe) `.load()`, #480.
+
+
+## [3.13.0] - 2019-03-20
+### Security
+- Security fix: `safeLoad()` can hang when arrays with nested refs
+  used as key. Now throws exception for nested arrays. #475.
+
+
+## [3.12.2] - 2019-02-26
+### Fixed
+- Fix `noArrayIndent` option for root level, #468.
+
+
+## [3.12.1] - 2019-01-05
+### Added
+- Added `noArrayIndent` option, #432.
+
+
+## [3.12.0] - 2018-06-02
+### Changed
+- Support arrow functions without a block statement, #421.
+
+
+## [3.11.0] - 2018-03-05
+### Added
+- Add arrow functions suport for `!!js/function`.
+
+### Fixed
+- Fix dump in bin/octal/hex formats for negative integers, #399.
+
+
+## [3.10.0] - 2017-09-10
+### Fixed
+- Fix `condenseFlow` output (quote keys for sure, instead of spaces), #371, #370.
+- Dump astrals as codepoints instead of surrogate pair, #368.
+
+
+## [3.9.1] - 2017-07-08
+### Fixed
+- Ensure stack is present for custom errors in node 7.+, #351.
+
+
+## [3.9.0] - 2017-07-08
+### Added
+- Add `condenseFlow` option (to create pretty URL query params), #346.
+
+### Fixed
+- Support array return from safeLoadAll/loadAll, #350.
+
+
+## [3.8.4] - 2017-05-08
+### Fixed
+- Dumper: prevent space after dash for arrays that wrap, #343.
+
+
+## [3.8.3] - 2017-04-05
+### Fixed
+- Should not allow numbers to begin and end with underscore, #335.
+
+
+## [3.8.2] - 2017-03-02
+### Fixed
+- Fix `!!float 123` (integers) parse, #333.
+- Don't allow leading zeros in floats (except 0, 0.xxx).
+- Allow positive exponent without sign in floats.
+
+
+## [3.8.1] - 2017-02-07
+### Changed
+- Maintenance: update browserified build.
+
+
+## [3.8.0] - 2017-02-07
+### Fixed
+- Fix reported position for `duplicated mapping key` errors.
+  Now points to block start instead of block end.
+  (#243, thanks to @shockey).
+
+
+## [3.7.0] - 2016-11-12
+### Added
+- Support polymorphism for tags (#300, thanks to @monken).
+
+### Fixed
+- Fix parsing of quotes followed by newlines (#304, thanks to @dplepage).
+
+
+## [3.6.1] - 2016-05-11
+### Fixed
+- Fix output cut on a pipe, #286.
+
+
+## [3.6.0] - 2016-04-16
+### Fixed
+- Dumper rewrite, fix multiple bugs with trailing `\n`.
+  Big thanks to @aepsilon!
+- Loader: fix leading/trailing newlines in block scalars, @aepsilon.
+
+
+## [3.5.5] - 2016-03-17
+### Fixed
+- Date parse fix: don't allow dates with on digit in month and day, #268.
+
+
+## [3.5.4] - 2016-03-09
+### Added
+- `noCompatMode` for dumper, to disable quoting YAML 1.1 values.
+
+
+## [3.5.3] - 2016-02-11
+### Changed
+- Maintenance release.
+
+
+## [3.5.2] - 2016-01-11
+### Changed
+- Maintenance: missed comma in bower config.
+
+
+## [3.5.1] - 2016-01-11
+### Changed
+- Removed `inherit` dependency, #239.
+- Better browserify workaround for esprima load.
+- Demo rewrite.
+
+
+## [3.5.0] - 2016-01-10
+### Fixed
+- Dumper. Fold strings only, #217.
+- Dumper. `norefs` option, to clone linked objects, #229.
+- Loader. Throw a warning for duplicate keys, #166.
+- Improved browserify support (mark `esprima` & `Buffer` excluded).
+
+
+## [3.4.6] - 2015-11-26
+### Changed
+- Use standalone `inherit` to keep browserified files clear.
+
+
+## [3.4.5] - 2015-11-23
+### Added
+- Added `lineWidth` option to dumper.
+
+
+## [3.4.4] - 2015-11-21
+### Fixed
+- Fixed floats dump (missed dot for scientific format), #220.
+- Allow non-printable characters inside quoted scalars, #192.
+
+
+## [3.4.3] - 2015-10-10
+### Changed
+- Maintenance release - deps bump (esprima, argparse).
+
+
+## [3.4.2] - 2015-09-09
+### Fixed
+- Fixed serialization of duplicated entries in sequences, #205.
+  Thanks to @vogelsgesang.
+
+
+## [3.4.1] - 2015-09-05
+### Fixed
+- Fixed stacktrace handling in generated errors, for browsers (FF/IE).
+
+
+## [3.4.0] - 2015-08-23
+### Changed
+- Don't throw on warnings anymore. Use `onWarning` option to catch.
+- Throw error on unknown tags (was warning before).
+- Reworked internals of error class.
+
+### Fixed
+- Fixed multiline keys dump, #197. Thanks to @tcr.
+- Fixed heading line breaks in some scalars (regression).
+
+
+## [3.3.1] - 2015-05-13
+### Added
+- Added `.sortKeys` dumper option, thanks to @rjmunro.
+
+### Fixed
+- Fixed astral characters support, #191.
+
+
+## [3.3.0] - 2015-04-26
+### Changed
+- Significantly improved long strings formatting in dumper, thanks to @isaacs.
+- Strip BOM if exists.
+
+
+## [3.2.7] - 2015-02-19
+### Changed
+- Maintenance release.
+- Updated dependencies.
+- HISTORY.md -> CHANGELOG.md
+
+
+## [3.2.6] - 2015-02-07
+### Fixed
+- Fixed encoding of UTF-16 surrogate pairs. (e.g. "\U0001F431" CAT FACE).
+- Fixed demo dates dump (#113, thanks to @Hypercubed).
+
+
+## [3.2.5] - 2014-12-28
+### Fixed
+- Fixed resolving of all built-in types on empty nodes.
+- Fixed invalid warning on empty lines within quoted scalars and flow collections.
+- Fixed bug: Tag on an empty node didn't resolve in some cases.
+
+
+## [3.2.4] - 2014-12-19
+### Fixed
+- Fixed resolving of !!null tag on an empty node.
+
+
+## [3.2.3] - 2014-11-08
+### Fixed
+- Implemented dumping of objects with circular and cross references.
+- Partially fixed aliasing of constructed objects. (see issue #141 for details)
+
+
+## [3.2.2] - 2014-09-07
+### Fixed
+- Fixed infinite loop on unindented block scalars.
+- Rewritten base64 encode/decode in binary type, to keep code licence clear.
+
+
+## [3.2.1] - 2014-08-24
+### Fixed
+- Nothig new. Just fix npm publish error.
+
+
+## [3.2.0] - 2014-08-24
+### Added
+- Added input piping support to CLI.
+
+### Fixed
+- Fixed typo, that could cause hand on initial indent (#139).
+
+
+## [3.1.0] - 2014-07-07
+### Changed
+- 1.5x-2x speed boost.
+- Removed deprecated `require('xxx.yml')` support.
+- Significant code cleanup and refactoring.
+- Internal API changed. If you used custom types - see updated examples.
+  Others are not affected.
+- Even if the input string has no trailing line break character,
+  it will be parsed as if it has one.
+- Added benchmark scripts.
+- Moved bower files to /dist folder
+- Bugfixes.
+
+
+## [3.0.2] - 2014-02-27
+### Fixed
+- Fixed bug: "constructor" string parsed as `null`.
+
+
+## [3.0.1] - 2013-12-22
+### Fixed
+- Fixed parsing of literal scalars. (issue #108)
+- Prevented adding unnecessary spaces in object dumps. (issue #68)
+- Fixed dumping of objects with very long (> 1024 in length) keys.
+
+
+## [3.0.0] - 2013-12-16
+### Changed
+- Refactored code. Changed API for custom types.
+- Removed output colors in CLI, dump json by default.
+- Removed big dependencies from browser version (esprima, buffer). Load `esprima` manually, if `!!js/function` needed. `!!bin` now returns Array in browser
+- AMD support.
+- Don't quote dumped strings because of `-` & `?` (if not first char).
+- __Deprecated__ loading yaml files via `require()`, as not recommended
+  behaviour for node.
+
+
+## [2.1.3] - 2013-10-16
+### Fixed
+- Fix wrong loading of empty block scalars.
+
+
+## [2.1.2] - 2013-10-07
+### Fixed
+- Fix unwanted line breaks in folded scalars.
+
+
+## [2.1.1] - 2013-10-02
+### Fixed
+- Dumper now respects deprecated booleans syntax from YAML 1.0/1.1
+- Fixed reader bug in JSON-like sequences/mappings.
+
+
+## [2.1.0] - 2013-06-05
+### Added
+- Add standard YAML schemas: Failsafe (`FAILSAFE_SCHEMA`),
+  JSON (`JSON_SCHEMA`) and Core (`CORE_SCHEMA`).
+- Add `skipInvalid` dumper option.
+
+### Changed
+- Rename `DEFAULT_SCHEMA` to `DEFAULT_FULL_SCHEMA`
+  and `SAFE_SCHEMA` to `DEFAULT_SAFE_SCHEMA`.
+- Use `safeLoad` for `require` extension.
+
+### Fixed
+- Bug fix: export `NIL` constant from the public interface.
+
+
+## [2.0.5] - 2013-04-26
+### Security
+- Close security issue in !!js/function constructor.
+  Big thanks to @nealpoole for security audit.
+
+
+## [2.0.4] - 2013-04-08
+### Changed
+- Updated .npmignore to reduce package size
+
+
+## [2.0.3] - 2013-02-26
+### Fixed
+- Fixed dumping of empty arrays ans objects. ([] and {} instead of null)
+
+
+## [2.0.2] - 2013-02-15
+### Fixed
+- Fixed input validation: tabs are printable characters.
+
+
+## [2.0.1] - 2013-02-09
+### Fixed
+- Fixed error, when options not passed to function cass
+
+
+## [2.0.0] - 2013-02-09
+### Changed
+- Full rewrite. New architecture. Fast one-stage parsing.
+- Changed custom types API.
+- Added YAML dumper.
+
+
+## [1.0.3] - 2012-11-05
+### Fixed
+- Fixed utf-8 files loading.
+
+
+## [1.0.2] - 2012-08-02
+### Fixed
+- Pull out hand-written shims. Use ES5-Shims for old browsers support. See #44.
+- Fix timstamps incorectly parsed in local time when no time part specified.
+
+
+## [1.0.1] - 2012-07-07
+### Fixed
+- Fixes `TypeError: 'undefined' is not an object` under Safari. Thanks Phuong.
+- Fix timestamps incorrectly parsed in local time. Thanks @caolan. Closes #46.
+
+
+## [1.0.0] - 2012-07-01
+### Changed
+- `y`, `yes`, `n`, `no`, `on`, `off` are not converted to Booleans anymore.
+  Fixes #42.
+- `require(filename)` now returns a single document and throws an Error if
+  file contains more than one document.
+- CLI was merged back from js-yaml.bin
+
+
+## [0.3.7] - 2012-02-28
+### Fixed
+- Fix export of `addConstructor()`. Closes #39.
+
+
+## [0.3.6] - 2012-02-22
+### Changed
+- Removed AMD parts - too buggy to use. Need help to rewrite from scratch
+
+### Fixed
+- Removed YUI compressor warning (renamed `double` variable). Closes #40.
+
+
+## [0.3.5] - 2012-01-10
+### Fixed
+- Workagound for .npmignore fuckup under windows. Thanks to airportyh.
+
+
+## [0.3.4] - 2011-12-24
+### Fixed
+- Fixes str[] for oldIEs support.
+- Adds better has change support for browserified demo.
+- improves compact output of Error. Closes #33.
+
+
+## [0.3.3] - 2011-12-20
+### Added
+- adds `compact` stringification of Errors.
+
+### Changed
+- jsyaml executable moved to separate module.
+
+
+## [0.3.2] - 2011-12-16
+### Added
+- Added jsyaml executable.
+- Added !!js/function support. Closes #12.
+
+### Fixed
+- Fixes ug with block style scalars. Closes #26.
+- All sources are passing JSLint now.
+- Fixes bug in Safari. Closes #28.
+- Fixes bug in Opers. Closes #29.
+- Improves browser support. Closes #20.
+
+
+## [0.3.1] - 2011-11-18
+### Added
+- Added AMD support for browserified version.
+- Added permalinks for online demo YAML snippets. Now we have YPaste service, lol.
+- Added !!js/regexp and !!js/undefined types. Partially solves #12.
+
+### Changed
+- Wrapped browserified js-yaml into closure.
+
+### Fixed
+- Fixed the resolvement of non-specific tags. Closes #17.
+- Fixed !!set mapping.
+- Fixed month parse in dates. Closes #19.
+
+
+## [0.3.0] - 2011-11-09
+### Added
+- Added browserified version. Closes #13.
+- Added live demo of browserified version.
+- Ported some of the PyYAML tests. See #14.
+
+### Fixed
+- Removed JS.Class dependency. Closes #3.
+- Fixed timestamp bug when fraction was given.
+
+
+## [0.2.2] - 2011-11-06
+### Fixed
+- Fixed crash on docs without ---. Closes #8.
+- Fixed multiline string parse
+- Fixed tests/comments for using array as key
+
+
+## [0.2.1] - 2011-11-02
+### Fixed
+- Fixed short file read (<4k). Closes #9.
+
+
+## [0.2.0] - 2011-11-02
+### Changed
+- First public release
+
+
+[4.1.0]: https://github.com/nodeca/js-yaml/compare/4.0.0...4.1.0
+[4.0.0]: https://github.com/nodeca/js-yaml/compare/3.14.0...4.0.0
+[3.14.0]: https://github.com/nodeca/js-yaml/compare/3.13.1...3.14.0
+[3.13.1]: https://github.com/nodeca/js-yaml/compare/3.13.0...3.13.1
+[3.13.0]: https://github.com/nodeca/js-yaml/compare/3.12.2...3.13.0
+[3.12.2]: https://github.com/nodeca/js-yaml/compare/3.12.1...3.12.2
+[3.12.1]: https://github.com/nodeca/js-yaml/compare/3.12.0...3.12.1
+[3.12.0]: https://github.com/nodeca/js-yaml/compare/3.11.0...3.12.0
+[3.11.0]: https://github.com/nodeca/js-yaml/compare/3.10.0...3.11.0
+[3.10.0]: https://github.com/nodeca/js-yaml/compare/3.9.1...3.10.0
+[3.9.1]: https://github.com/nodeca/js-yaml/compare/3.9.0...3.9.1
+[3.9.0]: https://github.com/nodeca/js-yaml/compare/3.8.4...3.9.0
+[3.8.4]: https://github.com/nodeca/js-yaml/compare/3.8.3...3.8.4
+[3.8.3]: https://github.com/nodeca/js-yaml/compare/3.8.2...3.8.3
+[3.8.2]: https://github.com/nodeca/js-yaml/compare/3.8.1...3.8.2
+[3.8.1]: https://github.com/nodeca/js-yaml/compare/3.8.0...3.8.1
+[3.8.0]: https://github.com/nodeca/js-yaml/compare/3.7.0...3.8.0
+[3.7.0]: https://github.com/nodeca/js-yaml/compare/3.6.1...3.7.0
+[3.6.1]: https://github.com/nodeca/js-yaml/compare/3.6.0...3.6.1
+[3.6.0]: https://github.com/nodeca/js-yaml/compare/3.5.5...3.6.0
+[3.5.5]: https://github.com/nodeca/js-yaml/compare/3.5.4...3.5.5
+[3.5.4]: https://github.com/nodeca/js-yaml/compare/3.5.3...3.5.4
+[3.5.3]: https://github.com/nodeca/js-yaml/compare/3.5.2...3.5.3
+[3.5.2]: https://github.com/nodeca/js-yaml/compare/3.5.1...3.5.2
+[3.5.1]: https://github.com/nodeca/js-yaml/compare/3.5.0...3.5.1
+[3.5.0]: https://github.com/nodeca/js-yaml/compare/3.4.6...3.5.0
+[3.4.6]: https://github.com/nodeca/js-yaml/compare/3.4.5...3.4.6
+[3.4.5]: https://github.com/nodeca/js-yaml/compare/3.4.4...3.4.5
+[3.4.4]: https://github.com/nodeca/js-yaml/compare/3.4.3...3.4.4
+[3.4.3]: https://github.com/nodeca/js-yaml/compare/3.4.2...3.4.3
+[3.4.2]: https://github.com/nodeca/js-yaml/compare/3.4.1...3.4.2
+[3.4.1]: https://github.com/nodeca/js-yaml/compare/3.4.0...3.4.1
+[3.4.0]: https://github.com/nodeca/js-yaml/compare/3.3.1...3.4.0
+[3.3.1]: https://github.com/nodeca/js-yaml/compare/3.3.0...3.3.1
+[3.3.0]: https://github.com/nodeca/js-yaml/compare/3.2.7...3.3.0
+[3.2.7]: https://github.com/nodeca/js-yaml/compare/3.2.6...3.2.7
+[3.2.6]: https://github.com/nodeca/js-yaml/compare/3.2.5...3.2.6
+[3.2.5]: https://github.com/nodeca/js-yaml/compare/3.2.4...3.2.5
+[3.2.4]: https://github.com/nodeca/js-yaml/compare/3.2.3...3.2.4
+[3.2.3]: https://github.com/nodeca/js-yaml/compare/3.2.2...3.2.3
+[3.2.2]: https://github.com/nodeca/js-yaml/compare/3.2.1...3.2.2
+[3.2.1]: https://github.com/nodeca/js-yaml/compare/3.2.0...3.2.1
+[3.2.0]: https://github.com/nodeca/js-yaml/compare/3.1.0...3.2.0
+[3.1.0]: https://github.com/nodeca/js-yaml/compare/3.0.2...3.1.0
+[3.0.2]: https://github.com/nodeca/js-yaml/compare/3.0.1...3.0.2
+[3.0.1]: https://github.com/nodeca/js-yaml/compare/3.0.0...3.0.1
+[3.0.0]: https://github.com/nodeca/js-yaml/compare/2.1.3...3.0.0
+[2.1.3]: https://github.com/nodeca/js-yaml/compare/2.1.2...2.1.3
+[2.1.2]: https://github.com/nodeca/js-yaml/compare/2.1.1...2.1.2
+[2.1.1]: https://github.com/nodeca/js-yaml/compare/2.1.0...2.1.1
+[2.1.0]: https://github.com/nodeca/js-yaml/compare/2.0.5...2.1.0
+[2.0.5]: https://github.com/nodeca/js-yaml/compare/2.0.4...2.0.5
+[2.0.4]: https://github.com/nodeca/js-yaml/compare/2.0.3...2.0.4
+[2.0.3]: https://github.com/nodeca/js-yaml/compare/2.0.2...2.0.3
+[2.0.2]: https://github.com/nodeca/js-yaml/compare/2.0.1...2.0.2
+[2.0.1]: https://github.com/nodeca/js-yaml/compare/2.0.0...2.0.1
+[2.0.0]: https://github.com/nodeca/js-yaml/compare/1.0.3...2.0.0
+[1.0.3]: https://github.com/nodeca/js-yaml/compare/1.0.2...1.0.3
+[1.0.2]: https://github.com/nodeca/js-yaml/compare/1.0.1...1.0.2
+[1.0.1]: https://github.com/nodeca/js-yaml/compare/1.0.0...1.0.1
+[1.0.0]: https://github.com/nodeca/js-yaml/compare/0.3.7...1.0.0
+[0.3.7]: https://github.com/nodeca/js-yaml/compare/0.3.6...0.3.7
+[0.3.6]: https://github.com/nodeca/js-yaml/compare/0.3.5...0.3.6
+[0.3.5]: https://github.com/nodeca/js-yaml/compare/0.3.4...0.3.5
+[0.3.4]: https://github.com/nodeca/js-yaml/compare/0.3.3...0.3.4
+[0.3.3]: https://github.com/nodeca/js-yaml/compare/0.3.2...0.3.3
+[0.3.2]: https://github.com/nodeca/js-yaml/compare/0.3.1...0.3.2
+[0.3.1]: https://github.com/nodeca/js-yaml/compare/0.3.0...0.3.1
+[0.3.0]: https://github.com/nodeca/js-yaml/compare/0.2.2...0.3.0
+[0.2.2]: https://github.com/nodeca/js-yaml/compare/0.2.1...0.2.2
+[0.2.1]: https://github.com/nodeca/js-yaml/compare/0.2.0...0.2.1
+[0.2.0]: https://github.com/nodeca/js-yaml/releases/tag/0.2.0
diff --git a/node_modules/js-yaml/LICENSE b/node_modules/js-yaml/LICENSE
new file mode 100644
index 0000000..09d3a29
--- /dev/null
+++ b/node_modules/js-yaml/LICENSE
@@ -0,0 +1,21 @@
+(The MIT License)
+
+Copyright (C) 2011-2015 by Vitaly Puzrin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/node_modules/js-yaml/README.md b/node_modules/js-yaml/README.md
new file mode 100644
index 0000000..3cbc4bd
--- /dev/null
+++ b/node_modules/js-yaml/README.md
@@ -0,0 +1,246 @@
+JS-YAML - YAML 1.2 parser / writer for JavaScript
+=================================================
+
+[![CI](https://github.com/nodeca/js-yaml/workflows/CI/badge.svg?branch=master)](https://github.com/nodeca/js-yaml/actions)
+[![NPM version](https://img.shields.io/npm/v/js-yaml.svg)](https://www.npmjs.org/package/js-yaml)
+
+__[Online Demo](http://nodeca.github.com/js-yaml/)__
+
+
+This is an implementation of [YAML](http://yaml.org/), a human-friendly data
+serialization language. Started as [PyYAML](http://pyyaml.org/) port, it was
+completely rewritten from scratch. Now it's very fast, and supports 1.2 spec.
+
+
+Installation
+------------
+
+### YAML module for node.js
+
+```
+npm install js-yaml
+```
+
+
+### CLI executable
+
+If you want to inspect your YAML files from CLI, install js-yaml globally:
+
+```
+npm install -g js-yaml
+```
+
+#### Usage
+
+```
+usage: js-yaml [-h] [-v] [-c] [-t] file
+
+Positional arguments:
+  file           File with YAML document(s)
+
+Optional arguments:
+  -h, --help     Show this help message and exit.
+  -v, --version  Show program's version number and exit.
+  -c, --compact  Display errors in compact mode
+  -t, --trace    Show stack trace on error
+```
+
+
+API
+---
+
+Here we cover the most 'useful' methods. If you need advanced details (creating
+your own tags), see [examples](https://github.com/nodeca/js-yaml/tree/master/examples)
+for more info.
+
+``` javascript
+const yaml = require('js-yaml');
+const fs   = require('fs');
+
+// Get document, or throw exception on error
+try {
+  const doc = yaml.load(fs.readFileSync('/home/ixti/example.yml', 'utf8'));
+  console.log(doc);
+} catch (e) {
+  console.log(e);
+}
+```
+
+
+### load (string [ , options ])
+
+Parses `string` as single YAML document. Returns either a
+plain object, a string, a number, `null` or `undefined`, or throws `YAMLException` on error. By default, does
+not support regexps, functions and undefined.
+
+options:
+
+- `filename` _(default: null)_ - string to be used as a file path in
+  error/warning messages.
+- `onWarning` _(default: null)_ - function to call on warning messages.
+  Loader will call this function with an instance of `YAMLException` for each warning.
+- `schema` _(default: `DEFAULT_SCHEMA`)_ - specifies a schema to use.
+  - `FAILSAFE_SCHEMA` - only strings, arrays and plain objects:
+    http://www.yaml.org/spec/1.2/spec.html#id2802346
+  - `JSON_SCHEMA` - all JSON-supported types:
+    http://www.yaml.org/spec/1.2/spec.html#id2803231
+  - `CORE_SCHEMA` - same as `JSON_SCHEMA`:
+    http://www.yaml.org/spec/1.2/spec.html#id2804923
+  - `DEFAULT_SCHEMA` - all supported YAML types.
+- `json` _(default: false)_ - compatibility with JSON.parse behaviour. If true, then duplicate keys in a mapping will override values rather than throwing an error.
+
+NOTE: This function **does not** understand multi-document sources, it throws
+exception on those.
+
+NOTE: JS-YAML **does not** support schema-specific tag resolution restrictions.
+So, the JSON schema is not as strictly defined in the YAML specification.
+It allows numbers in any notation, use `Null` and `NULL` as `null`, etc.
+The core schema also has no such restrictions. It allows binary notation for integers.
+
+
+### loadAll (string [, iterator] [, options ])
+
+Same as `load()`, but understands multi-document sources. Applies
+`iterator` to each document if specified, or returns array of documents.
+
+``` javascript
+const yaml = require('js-yaml');
+
+yaml.loadAll(data, function (doc) {
+  console.log(doc);
+});
+```
+
+
+### dump (object [ , options ])
+
+Serializes `object` as a YAML document. Uses `DEFAULT_SCHEMA`, so it will
+throw an exception if you try to dump regexps or functions. However, you can
+disable exceptions by setting the `skipInvalid` option to `true`.
+
+options:
+
+- `indent` _(default: 2)_ - indentation width to use (in spaces).
+- `noArrayIndent` _(default: false)_ - when true, will not add an indentation level to array elements
+- `skipInvalid` _(default: false)_ - do not throw on invalid types (like function
+  in the safe schema) and skip pairs and single values with such types.
+- `flowLevel` _(default: -1)_ - specifies level of nesting, when to switch from
+  block to flow style for collections. -1 means block style everwhere
+- `styles` - "tag" => "style" map. Each tag may have own set of styles.
+- `schema` _(default: `DEFAULT_SCHEMA`)_ specifies a schema to use.
+- `sortKeys` _(default: `false`)_ - if `true`, sort keys when dumping YAML. If a
+  function, use the function to sort the keys.
+- `lineWidth` _(default: `80`)_ - set max line width. Set `-1` for unlimited width.
+- `noRefs` _(default: `false`)_ - if `true`, don't convert duplicate objects into references
+- `noCompatMode` _(default: `false`)_ - if `true` don't try to be compatible with older
+  yaml versions. Currently: don't quote "yes", "no" and so on, as required for YAML 1.1
+- `condenseFlow` _(default: `false`)_ - if `true` flow sequences will be condensed, omitting the space between `a, b`. Eg. `'[a,b]'`, and omitting the space between `key: value` and quoting the key. Eg. `'{"a":b}'` Can be useful when using yaml for pretty URL query params as spaces are %-encoded.
+- `quotingType` _(`'` or `"`, default: `'`)_ - strings will be quoted using this quoting style. If you specify single quotes, double quotes will still be used for non-printable characters.
+- `forceQuotes` _(default: `false`)_ - if `true`, all non-key strings will be quoted even if they normally don't need to.
+- `replacer` - callback `function (key, value)` called recursively on each key/value in source object (see `replacer` docs for `JSON.stringify`).
+
+The following table show availlable styles (e.g. "canonical",
+"binary"...) available for each tag (.e.g. !!null, !!int ...). Yaml
+output is shown on the right side after `=>` (default setting) or `->`:
+
+``` none
+!!null
+  "canonical"   -> "~"
+  "lowercase"   => "null"
+  "uppercase"   -> "NULL"
+  "camelcase"   -> "Null"
+
+!!int
+  "binary"      -> "0b1", "0b101010", "0b1110001111010"
+  "octal"       -> "0o1", "0o52", "0o16172"
+  "decimal"     => "1", "42", "7290"
+  "hexadecimal" -> "0x1", "0x2A", "0x1C7A"
+
+!!bool
+  "lowercase"   => "true", "false"
+  "uppercase"   -> "TRUE", "FALSE"
+  "camelcase"   -> "True", "False"
+
+!!float
+  "lowercase"   => ".nan", '.inf'
+  "uppercase"   -> ".NAN", '.INF'
+  "camelcase"   -> ".NaN", '.Inf'
+```
+
+Example:
+
+``` javascript
+dump(object, {
+  'styles': {
+    '!!null': 'canonical' // dump null as ~
+  },
+  'sortKeys': true        // sort object keys
+});
+```
+
+Supported YAML types
+--------------------
+
+The list of standard YAML tags and corresponding JavaScript types. See also
+[YAML tag discussion](http://pyyaml.org/wiki/YAMLTagDiscussion) and
+[YAML types repository](http://yaml.org/type/).
+
+```
+!!null ''                   # null
+!!bool 'yes'                # bool
+!!int '3...'                # number
+!!float '3.14...'           # number
+!!binary '...base64...'     # buffer
+!!timestamp 'YYYY-...'      # date
+!!omap [ ... ]              # array of key-value pairs
+!!pairs [ ... ]             # array or array pairs
+!!set { ... }               # array of objects with given keys and null values
+!!str '...'                 # string
+!!seq [ ... ]               # array
+!!map { ... }               # object
+```
+
+**JavaScript-specific tags**
+
+See [js-yaml-js-types](https://github.com/nodeca/js-yaml-js-types) for
+extra types.
+
+
+Caveats
+-------
+
+Note, that you use arrays or objects as key in JS-YAML. JS does not allow objects
+or arrays as keys, and stringifies (by calling `toString()` method) them at the
+moment of adding them.
+
+``` yaml
+---
+? [ foo, bar ]
+: - baz
+? { foo: bar }
+: - baz
+  - baz
+```
+
+``` javascript
+{ "foo,bar": ["baz"], "[object Object]": ["baz", "baz"] }
+```
+
+Also, reading of properties on implicit block mapping keys is not supported yet.
+So, the following YAML document cannot be loaded.
+
+``` yaml
+&anchor foo:
+  foo: bar
+  *anchor: duplicate key
+  baz: bat
+  *anchor: duplicate key
+```
+
+
+js-yaml for enterprise
+----------------------
+
+Available as part of the Tidelift Subscription
+
+The maintainers of js-yaml and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. [Learn more.](https://tidelift.com/subscription/pkg/npm-js-yaml?utm_source=npm-js-yaml&utm_medium=referral&utm_campaign=enterprise&utm_term=repo)
diff --git a/node_modules/js-yaml/bin/js-yaml.js b/node_modules/js-yaml/bin/js-yaml.js
new file mode 100755
index 0000000..a182f1a
--- /dev/null
+++ b/node_modules/js-yaml/bin/js-yaml.js
@@ -0,0 +1,126 @@
+#!/usr/bin/env node
+
+
+'use strict';
+
+/*eslint-disable no-console*/
+
+
+var fs       = require('fs');
+var argparse = require('argparse');
+var yaml     = require('..');
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+var cli = new argparse.ArgumentParser({
+  prog:     'js-yaml',
+  add_help:  true
+});
+
+cli.add_argument('-v', '--version', {
+  action: 'version',
+  version: require('../package.json').version
+});
+
+cli.add_argument('-c', '--compact', {
+  help:   'Display errors in compact mode',
+  action: 'store_true'
+});
+
+// deprecated (not needed after we removed output colors)
+// option suppressed, but not completely removed for compatibility
+cli.add_argument('-j', '--to-json', {
+  help:   argparse.SUPPRESS,
+  dest:   'json',
+  action: 'store_true'
+});
+
+cli.add_argument('-t', '--trace', {
+  help:   'Show stack trace on error',
+  action: 'store_true'
+});
+
+cli.add_argument('file', {
+  help:   'File to read, utf-8 encoded without BOM',
+  nargs:  '?',
+  default: '-'
+});
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+var options = cli.parse_args();
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+function readFile(filename, encoding, callback) {
+  if (options.file === '-') {
+    // read from stdin
+
+    var chunks = [];
+
+    process.stdin.on('data', function (chunk) {
+      chunks.push(chunk);
+    });
+
+    process.stdin.on('end', function () {
+      return callback(null, Buffer.concat(chunks).toString(encoding));
+    });
+  } else {
+    fs.readFile(filename, encoding, callback);
+  }
+}
+
+readFile(options.file, 'utf8', function (error, input) {
+  var output, isYaml;
+
+  if (error) {
+    if (error.code === 'ENOENT') {
+      console.error('File not found: ' + options.file);
+      process.exit(2);
+    }
+
+    console.error(
+      options.trace && error.stack ||
+      error.message ||
+      String(error));
+
+    process.exit(1);
+  }
+
+  try {
+    output = JSON.parse(input);
+    isYaml = false;
+  } catch (err) {
+    if (err instanceof SyntaxError) {
+      try {
+        output = [];
+        yaml.loadAll(input, function (doc) { output.push(doc); }, {});
+        isYaml = true;
+
+        if (output.length === 0) output = null;
+        else if (output.length === 1) output = output[0];
+
+      } catch (e) {
+        if (options.trace && err.stack) console.error(e.stack);
+        else console.error(e.toString(options.compact));
+
+        process.exit(1);
+      }
+    } else {
+      console.error(
+        options.trace && err.stack ||
+        err.message ||
+        String(err));
+
+      process.exit(1);
+    }
+  }
+
+  if (isYaml) console.log(JSON.stringify(output, null, '  '));
+  else console.log(yaml.dump(output));
+});
diff --git a/node_modules/js-yaml/dist/js-yaml.js b/node_modules/js-yaml/dist/js-yaml.js
new file mode 100644
index 0000000..4cc0ddf
--- /dev/null
+++ b/node_modules/js-yaml/dist/js-yaml.js
@@ -0,0 +1,3874 @@
+
+/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.jsyaml = {}));
+}(this, (function (exports) { 'use strict';
+
+  function isNothing(subject) {
+    return (typeof subject === 'undefined') || (subject === null);
+  }
+
+
+  function isObject(subject) {
+    return (typeof subject === 'object') && (subject !== null);
+  }
+
+
+  function toArray(sequence) {
+    if (Array.isArray(sequence)) return sequence;
+    else if (isNothing(sequence)) return [];
+
+    return [ sequence ];
+  }
+
+
+  function extend(target, source) {
+    var index, length, key, sourceKeys;
+
+    if (source) {
+      sourceKeys = Object.keys(source);
+
+      for (index = 0, length = sourceKeys.length; index < length; index += 1) {
+        key = sourceKeys[index];
+        target[key] = source[key];
+      }
+    }
+
+    return target;
+  }
+
+
+  function repeat(string, count) {
+    var result = '', cycle;
+
+    for (cycle = 0; cycle < count; cycle += 1) {
+      result += string;
+    }
+
+    return result;
+  }
+
+
+  function isNegativeZero(number) {
+    return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
+  }
+
+
+  var isNothing_1      = isNothing;
+  var isObject_1       = isObject;
+  var toArray_1        = toArray;
+  var repeat_1         = repeat;
+  var isNegativeZero_1 = isNegativeZero;
+  var extend_1         = extend;
+
+  var common = {
+  	isNothing: isNothing_1,
+  	isObject: isObject_1,
+  	toArray: toArray_1,
+  	repeat: repeat_1,
+  	isNegativeZero: isNegativeZero_1,
+  	extend: extend_1
+  };
+
+  // YAML error class. http://stackoverflow.com/questions/8458984
+
+
+  function formatError(exception, compact) {
+    var where = '', message = exception.reason || '(unknown reason)';
+
+    if (!exception.mark) return message;
+
+    if (exception.mark.name) {
+      where += 'in "' + exception.mark.name + '" ';
+    }
+
+    where += '(' + (exception.mark.line + 1) + ':' + (exception.mark.column + 1) + ')';
+
+    if (!compact && exception.mark.snippet) {
+      where += '\n\n' + exception.mark.snippet;
+    }
+
+    return message + ' ' + where;
+  }
+
+
+  function YAMLException$1(reason, mark) {
+    // Super constructor
+    Error.call(this);
+
+    this.name = 'YAMLException';
+    this.reason = reason;
+    this.mark = mark;
+    this.message = formatError(this, false);
+
+    // Include stack trace in error object
+    if (Error.captureStackTrace) {
+      // Chrome and NodeJS
+      Error.captureStackTrace(this, this.constructor);
+    } else {
+      // FF, IE 10+ and Safari 6+. Fallback for others
+      this.stack = (new Error()).stack || '';
+    }
+  }
+
+
+  // Inherit from Error
+  YAMLException$1.prototype = Object.create(Error.prototype);
+  YAMLException$1.prototype.constructor = YAMLException$1;
+
+
+  YAMLException$1.prototype.toString = function toString(compact) {
+    return this.name + ': ' + formatError(this, compact);
+  };
+
+
+  var exception = YAMLException$1;
+
+  // get snippet for a single line, respecting maxLength
+  function getLine(buffer, lineStart, lineEnd, position, maxLineLength) {
+    var head = '';
+    var tail = '';
+    var maxHalfLength = Math.floor(maxLineLength / 2) - 1;
+
+    if (position - lineStart > maxHalfLength) {
+      head = ' ... ';
+      lineStart = position - maxHalfLength + head.length;
+    }
+
+    if (lineEnd - position > maxHalfLength) {
+      tail = ' ...';
+      lineEnd = position + maxHalfLength - tail.length;
+    }
+
+    return {
+      str: head + buffer.slice(lineStart, lineEnd).replace(/\t/g, '→') + tail,
+      pos: position - lineStart + head.length // relative position
+    };
+  }
+
+
+  function padStart(string, max) {
+    return common.repeat(' ', max - string.length) + string;
+  }
+
+
+  function makeSnippet(mark, options) {
+    options = Object.create(options || null);
+
+    if (!mark.buffer) return null;
+
+    if (!options.maxLength) options.maxLength = 79;
+    if (typeof options.indent      !== 'number') options.indent      = 1;
+    if (typeof options.linesBefore !== 'number') options.linesBefore = 3;
+    if (typeof options.linesAfter  !== 'number') options.linesAfter  = 2;
+
+    var re = /\r?\n|\r|\0/g;
+    var lineStarts = [ 0 ];
+    var lineEnds = [];
+    var match;
+    var foundLineNo = -1;
+
+    while ((match = re.exec(mark.buffer))) {
+      lineEnds.push(match.index);
+      lineStarts.push(match.index + match[0].length);
+
+      if (mark.position <= match.index && foundLineNo < 0) {
+        foundLineNo = lineStarts.length - 2;
+      }
+    }
+
+    if (foundLineNo < 0) foundLineNo = lineStarts.length - 1;
+
+    var result = '', i, line;
+    var lineNoLength = Math.min(mark.line + options.linesAfter, lineEnds.length).toString().length;
+    var maxLineLength = options.maxLength - (options.indent + lineNoLength + 3);
+
+    for (i = 1; i <= options.linesBefore; i++) {
+      if (foundLineNo - i < 0) break;
+      line = getLine(
+        mark.buffer,
+        lineStarts[foundLineNo - i],
+        lineEnds[foundLineNo - i],
+        mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo - i]),
+        maxLineLength
+      );
+      result = common.repeat(' ', options.indent) + padStart((mark.line - i + 1).toString(), lineNoLength) +
+        ' | ' + line.str + '\n' + result;
+    }
+
+    line = getLine(mark.buffer, lineStarts[foundLineNo], lineEnds[foundLineNo], mark.position, maxLineLength);
+    result += common.repeat(' ', options.indent) + padStart((mark.line + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n';
+    result += common.repeat('-', options.indent + lineNoLength + 3 + line.pos) + '^' + '\n';
+
+    for (i = 1; i <= options.linesAfter; i++) {
+      if (foundLineNo + i >= lineEnds.length) break;
+      line = getLine(
+        mark.buffer,
+        lineStarts[foundLineNo + i],
+        lineEnds[foundLineNo + i],
+        mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo + i]),
+        maxLineLength
+      );
+      result += common.repeat(' ', options.indent) + padStart((mark.line + i + 1).toString(), lineNoLength) +
+        ' | ' + line.str + '\n';
+    }
+
+    return result.replace(/\n$/, '');
+  }
+
+
+  var snippet = makeSnippet;
+
+  var TYPE_CONSTRUCTOR_OPTIONS = [
+    'kind',
+    'multi',
+    'resolve',
+    'construct',
+    'instanceOf',
+    'predicate',
+    'represent',
+    'representName',
+    'defaultStyle',
+    'styleAliases'
+  ];
+
+  var YAML_NODE_KINDS = [
+    'scalar',
+    'sequence',
+    'mapping'
+  ];
+
+  function compileStyleAliases(map) {
+    var result = {};
+
+    if (map !== null) {
+      Object.keys(map).forEach(function (style) {
+        map[style].forEach(function (alias) {
+          result[String(alias)] = style;
+        });
+      });
+    }
+
+    return result;
+  }
+
+  function Type$1(tag, options) {
+    options = options || {};
+
+    Object.keys(options).forEach(function (name) {
+      if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
+        throw new exception('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
+      }
+    });
+
+    // TODO: Add tag format check.
+    this.options       = options; // keep original options in case user wants to extend this type later
+    this.tag           = tag;
+    this.kind          = options['kind']          || null;
+    this.resolve       = options['resolve']       || function () { return true; };
+    this.construct     = options['construct']     || function (data) { return data; };
+    this.instanceOf    = options['instanceOf']    || null;
+    this.predicate     = options['predicate']     || null;
+    this.represent     = options['represent']     || null;
+    this.representName = options['representName'] || null;
+    this.defaultStyle  = options['defaultStyle']  || null;
+    this.multi         = options['multi']         || false;
+    this.styleAliases  = compileStyleAliases(options['styleAliases'] || null);
+
+    if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
+      throw new exception('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
+    }
+  }
+
+  var type = Type$1;
+
+  /*eslint-disable max-len*/
+
+
+
+
+
+  function compileList(schema, name) {
+    var result = [];
+
+    schema[name].forEach(function (currentType) {
+      var newIndex = result.length;
+
+      result.forEach(function (previousType, previousIndex) {
+        if (previousType.tag === currentType.tag &&
+            previousType.kind === currentType.kind &&
+            previousType.multi === currentType.multi) {
+
+          newIndex = previousIndex;
+        }
+      });
+
+      result[newIndex] = currentType;
+    });
+
+    return result;
+  }
+
+
+  function compileMap(/* lists... */) {
+    var result = {
+          scalar: {},
+          sequence: {},
+          mapping: {},
+          fallback: {},
+          multi: {
+            scalar: [],
+            sequence: [],
+            mapping: [],
+            fallback: []
+          }
+        }, index, length;
+
+    function collectType(type) {
+      if (type.multi) {
+        result.multi[type.kind].push(type);
+        result.multi['fallback'].push(type);
+      } else {
+        result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+      }
+    }
+
+    for (index = 0, length = arguments.length; index < length; index += 1) {
+      arguments[index].forEach(collectType);
+    }
+    return result;
+  }
+
+
+  function Schema$1(definition) {
+    return this.extend(definition);
+  }
+
+
+  Schema$1.prototype.extend = function extend(definition) {
+    var implicit = [];
+    var explicit = [];
+
+    if (definition instanceof type) {
+      // Schema.extend(type)
+      explicit.push(definition);
+
+    } else if (Array.isArray(definition)) {
+      // Schema.extend([ type1, type2, ... ])
+      explicit = explicit.concat(definition);
+
+    } else if (definition && (Array.isArray(definition.implicit) || Array.isArray(definition.explicit))) {
+      // Schema.extend({ explicit: [ type1, type2, ... ], implicit: [ type1, type2, ... ] })
+      if (definition.implicit) implicit = implicit.concat(definition.implicit);
+      if (definition.explicit) explicit = explicit.concat(definition.explicit);
+
+    } else {
+      throw new exception('Schema.extend argument should be a Type, [ Type ], ' +
+        'or a schema definition ({ implicit: [...], explicit: [...] })');
+    }
+
+    implicit.forEach(function (type$1) {
+      if (!(type$1 instanceof type)) {
+        throw new exception('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+      }
+
+      if (type$1.loadKind && type$1.loadKind !== 'scalar') {
+        throw new exception('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
+      }
+
+      if (type$1.multi) {
+        throw new exception('There is a multi type in the implicit list of a schema. Multi tags can only be listed as explicit.');
+      }
+    });
+
+    explicit.forEach(function (type$1) {
+      if (!(type$1 instanceof type)) {
+        throw new exception('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+      }
+    });
+
+    var result = Object.create(Schema$1.prototype);
+
+    result.implicit = (this.implicit || []).concat(implicit);
+    result.explicit = (this.explicit || []).concat(explicit);
+
+    result.compiledImplicit = compileList(result, 'implicit');
+    result.compiledExplicit = compileList(result, 'explicit');
+    result.compiledTypeMap  = compileMap(result.compiledImplicit, result.compiledExplicit);
+
+    return result;
+  };
+
+
+  var schema = Schema$1;
+
+  var str = new type('tag:yaml.org,2002:str', {
+    kind: 'scalar',
+    construct: function (data) { return data !== null ? data : ''; }
+  });
+
+  var seq = new type('tag:yaml.org,2002:seq', {
+    kind: 'sequence',
+    construct: function (data) { return data !== null ? data : []; }
+  });
+
+  var map = new type('tag:yaml.org,2002:map', {
+    kind: 'mapping',
+    construct: function (data) { return data !== null ? data : {}; }
+  });
+
+  var failsafe = new schema({
+    explicit: [
+      str,
+      seq,
+      map
+    ]
+  });
+
+  function resolveYamlNull(data) {
+    if (data === null) return true;
+
+    var max = data.length;
+
+    return (max === 1 && data === '~') ||
+           (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
+  }
+
+  function constructYamlNull() {
+    return null;
+  }
+
+  function isNull(object) {
+    return object === null;
+  }
+
+  var _null = new type('tag:yaml.org,2002:null', {
+    kind: 'scalar',
+    resolve: resolveYamlNull,
+    construct: constructYamlNull,
+    predicate: isNull,
+    represent: {
+      canonical: function () { return '~';    },
+      lowercase: function () { return 'null'; },
+      uppercase: function () { return 'NULL'; },
+      camelcase: function () { return 'Null'; },
+      empty:     function () { return '';     }
+    },
+    defaultStyle: 'lowercase'
+  });
+
+  function resolveYamlBoolean(data) {
+    if (data === null) return false;
+
+    var max = data.length;
+
+    return (max === 4 && (data === 'true' || data === 'True' || data === 'TRUE')) ||
+           (max === 5 && (data === 'false' || data === 'False' || data === 'FALSE'));
+  }
+
+  function constructYamlBoolean(data) {
+    return data === 'true' ||
+           data === 'True' ||
+           data === 'TRUE';
+  }
+
+  function isBoolean(object) {
+    return Object.prototype.toString.call(object) === '[object Boolean]';
+  }
+
+  var bool = new type('tag:yaml.org,2002:bool', {
+    kind: 'scalar',
+    resolve: resolveYamlBoolean,
+    construct: constructYamlBoolean,
+    predicate: isBoolean,
+    represent: {
+      lowercase: function (object) { return object ? 'true' : 'false'; },
+      uppercase: function (object) { return object ? 'TRUE' : 'FALSE'; },
+      camelcase: function (object) { return object ? 'True' : 'False'; }
+    },
+    defaultStyle: 'lowercase'
+  });
+
+  function isHexCode(c) {
+    return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
+           ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
+           ((0x61/* a */ <= c) && (c <= 0x66/* f */));
+  }
+
+  function isOctCode(c) {
+    return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
+  }
+
+  function isDecCode(c) {
+    return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
+  }
+
+  function resolveYamlInteger(data) {
+    if (data === null) return false;
+
+    var max = data.length,
+        index = 0,
+        hasDigits = false,
+        ch;
+
+    if (!max) return false;
+
+    ch = data[index];
+
+    // sign
+    if (ch === '-' || ch === '+') {
+      ch = data[++index];
+    }
+
+    if (ch === '0') {
+      // 0
+      if (index + 1 === max) return true;
+      ch = data[++index];
+
+      // base 2, base 8, base 16
+
+      if (ch === 'b') {
+        // base 2
+        index++;
+
+        for (; index < max; index++) {
+          ch = data[index];
+          if (ch === '_') continue;
+          if (ch !== '0' && ch !== '1') return false;
+          hasDigits = true;
+        }
+        return hasDigits && ch !== '_';
+      }
+
+
+      if (ch === 'x') {
+        // base 16
+        index++;
+
+        for (; index < max; index++) {
+          ch = data[index];
+          if (ch === '_') continue;
+          if (!isHexCode(data.charCodeAt(index))) return false;
+          hasDigits = true;
+        }
+        return hasDigits && ch !== '_';
+      }
+
+
+      if (ch === 'o') {
+        // base 8
+        index++;
+
+        for (; index < max; index++) {
+          ch = data[index];
+          if (ch === '_') continue;
+          if (!isOctCode(data.charCodeAt(index))) return false;
+          hasDigits = true;
+        }
+        return hasDigits && ch !== '_';
+      }
+    }
+
+    // base 10 (except 0)
+
+    // value should not start with `_`;
+    if (ch === '_') return false;
+
+    for (; index < max; index++) {
+      ch = data[index];
+      if (ch === '_') continue;
+      if (!isDecCode(data.charCodeAt(index))) {
+        return false;
+      }
+      hasDigits = true;
+    }
+
+    // Should have digits and should not end with `_`
+    if (!hasDigits || ch === '_') return false;
+
+    return true;
+  }
+
+  function constructYamlInteger(data) {
+    var value = data, sign = 1, ch;
+
+    if (value.indexOf('_') !== -1) {
+      value = value.replace(/_/g, '');
+    }
+
+    ch = value[0];
+
+    if (ch === '-' || ch === '+') {
+      if (ch === '-') sign = -1;
+      value = value.slice(1);
+      ch = value[0];
+    }
+
+    if (value === '0') return 0;
+
+    if (ch === '0') {
+      if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+      if (value[1] === 'x') return sign * parseInt(value.slice(2), 16);
+      if (value[1] === 'o') return sign * parseInt(value.slice(2), 8);
+    }
+
+    return sign * parseInt(value, 10);
+  }
+
+  function isInteger(object) {
+    return (Object.prototype.toString.call(object)) === '[object Number]' &&
+           (object % 1 === 0 && !common.isNegativeZero(object));
+  }
+
+  var int = new type('tag:yaml.org,2002:int', {
+    kind: 'scalar',
+    resolve: resolveYamlInteger,
+    construct: constructYamlInteger,
+    predicate: isInteger,
+    represent: {
+      binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
+      octal:       function (obj) { return obj >= 0 ? '0o'  + obj.toString(8) : '-0o'  + obj.toString(8).slice(1); },
+      decimal:     function (obj) { return obj.toString(10); },
+      /* eslint-disable max-len */
+      hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
+    },
+    defaultStyle: 'decimal',
+    styleAliases: {
+      binary:      [ 2,  'bin' ],
+      octal:       [ 8,  'oct' ],
+      decimal:     [ 10, 'dec' ],
+      hexadecimal: [ 16, 'hex' ]
+    }
+  });
+
+  var YAML_FLOAT_PATTERN = new RegExp(
+    // 2.5e4, 2.5 and integers
+    '^(?:[-+]?(?:[0-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
+    // .2e4, .2
+    // special case, seems not from spec
+    '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
+    // .inf
+    '|[-+]?\\.(?:inf|Inf|INF)' +
+    // .nan
+    '|\\.(?:nan|NaN|NAN))$');
+
+  function resolveYamlFloat(data) {
+    if (data === null) return false;
+
+    if (!YAML_FLOAT_PATTERN.test(data) ||
+        // Quick hack to not allow integers end with `_`
+        // Probably should update regexp & check speed
+        data[data.length - 1] === '_') {
+      return false;
+    }
+
+    return true;
+  }
+
+  function constructYamlFloat(data) {
+    var value, sign;
+
+    value  = data.replace(/_/g, '').toLowerCase();
+    sign   = value[0] === '-' ? -1 : 1;
+
+    if ('+-'.indexOf(value[0]) >= 0) {
+      value = value.slice(1);
+    }
+
+    if (value === '.inf') {
+      return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
+
+    } else if (value === '.nan') {
+      return NaN;
+    }
+    return sign * parseFloat(value, 10);
+  }
+
+
+  var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
+
+  function representYamlFloat(object, style) {
+    var res;
+
+    if (isNaN(object)) {
+      switch (style) {
+        case 'lowercase': return '.nan';
+        case 'uppercase': return '.NAN';
+        case 'camelcase': return '.NaN';
+      }
+    } else if (Number.POSITIVE_INFINITY === object) {
+      switch (style) {
+        case 'lowercase': return '.inf';
+        case 'uppercase': return '.INF';
+        case 'camelcase': return '.Inf';
+      }
+    } else if (Number.NEGATIVE_INFINITY === object) {
+      switch (style) {
+        case 'lowercase': return '-.inf';
+        case 'uppercase': return '-.INF';
+        case 'camelcase': return '-.Inf';
+      }
+    } else if (common.isNegativeZero(object)) {
+      return '-0.0';
+    }
+
+    res = object.toString(10);
+
+    // JS stringifier can build scientific format without dots: 5e-100,
+    // while YAML requres dot: 5.e-100. Fix it with simple hack
+
+    return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
+  }
+
+  function isFloat(object) {
+    return (Object.prototype.toString.call(object) === '[object Number]') &&
+           (object % 1 !== 0 || common.isNegativeZero(object));
+  }
+
+  var float = new type('tag:yaml.org,2002:float', {
+    kind: 'scalar',
+    resolve: resolveYamlFloat,
+    construct: constructYamlFloat,
+    predicate: isFloat,
+    represent: representYamlFloat,
+    defaultStyle: 'lowercase'
+  });
+
+  var json = failsafe.extend({
+    implicit: [
+      _null,
+      bool,
+      int,
+      float
+    ]
+  });
+
+  var core = json;
+
+  var YAML_DATE_REGEXP = new RegExp(
+    '^([0-9][0-9][0-9][0-9])'          + // [1] year
+    '-([0-9][0-9])'                    + // [2] month
+    '-([0-9][0-9])$');                   // [3] day
+
+  var YAML_TIMESTAMP_REGEXP = new RegExp(
+    '^([0-9][0-9][0-9][0-9])'          + // [1] year
+    '-([0-9][0-9]?)'                   + // [2] month
+    '-([0-9][0-9]?)'                   + // [3] day
+    '(?:[Tt]|[ \\t]+)'                 + // ...
+    '([0-9][0-9]?)'                    + // [4] hour
+    ':([0-9][0-9])'                    + // [5] minute
+    ':([0-9][0-9])'                    + // [6] second
+    '(?:\\.([0-9]*))?'                 + // [7] fraction
+    '(?:[ \\t]*(Z|([-+])([0-9][0-9]?)' + // [8] tz [9] tz_sign [10] tz_hour
+    '(?::([0-9][0-9]))?))?$');           // [11] tz_minute
+
+  function resolveYamlTimestamp(data) {
+    if (data === null) return false;
+    if (YAML_DATE_REGEXP.exec(data) !== null) return true;
+    if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
+    return false;
+  }
+
+  function constructYamlTimestamp(data) {
+    var match, year, month, day, hour, minute, second, fraction = 0,
+        delta = null, tz_hour, tz_minute, date;
+
+    match = YAML_DATE_REGEXP.exec(data);
+    if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
+
+    if (match === null) throw new Error('Date resolve error');
+
+    // match: [1] year [2] month [3] day
+
+    year = +(match[1]);
+    month = +(match[2]) - 1; // JS month starts with 0
+    day = +(match[3]);
+
+    if (!match[4]) { // no hour
+      return new Date(Date.UTC(year, month, day));
+    }
+
+    // match: [4] hour [5] minute [6] second [7] fraction
+
+    hour = +(match[4]);
+    minute = +(match[5]);
+    second = +(match[6]);
+
+    if (match[7]) {
+      fraction = match[7].slice(0, 3);
+      while (fraction.length < 3) { // milli-seconds
+        fraction += '0';
+      }
+      fraction = +fraction;
+    }
+
+    // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
+
+    if (match[9]) {
+      tz_hour = +(match[10]);
+      tz_minute = +(match[11] || 0);
+      delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
+      if (match[9] === '-') delta = -delta;
+    }
+
+    date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
+
+    if (delta) date.setTime(date.getTime() - delta);
+
+    return date;
+  }
+
+  function representYamlTimestamp(object /*, style*/) {
+    return object.toISOString();
+  }
+
+  var timestamp = new type('tag:yaml.org,2002:timestamp', {
+    kind: 'scalar',
+    resolve: resolveYamlTimestamp,
+    construct: constructYamlTimestamp,
+    instanceOf: Date,
+    represent: representYamlTimestamp
+  });
+
+  function resolveYamlMerge(data) {
+    return data === '<<' || data === null;
+  }
+
+  var merge = new type('tag:yaml.org,2002:merge', {
+    kind: 'scalar',
+    resolve: resolveYamlMerge
+  });
+
+  /*eslint-disable no-bitwise*/
+
+
+
+
+
+  // [ 64, 65, 66 ] -> [ padding, CR, LF ]
+  var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
+
+
+  function resolveYamlBinary(data) {
+    if (data === null) return false;
+
+    var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
+
+    // Convert one by one.
+    for (idx = 0; idx < max; idx++) {
+      code = map.indexOf(data.charAt(idx));
+
+      // Skip CR/LF
+      if (code > 64) continue;
+
+      // Fail on illegal characters
+      if (code < 0) return false;
+
+      bitlen += 6;
+    }
+
+    // If there are any bits left, source was corrupted
+    return (bitlen % 8) === 0;
+  }
+
+  function constructYamlBinary(data) {
+    var idx, tailbits,
+        input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
+        max = input.length,
+        map = BASE64_MAP,
+        bits = 0,
+        result = [];
+
+    // Collect by 6*4 bits (3 bytes)
+
+    for (idx = 0; idx < max; idx++) {
+      if ((idx % 4 === 0) && idx) {
+        result.push((bits >> 16) & 0xFF);
+        result.push((bits >> 8) & 0xFF);
+        result.push(bits & 0xFF);
+      }
+
+      bits = (bits << 6) | map.indexOf(input.charAt(idx));
+    }
+
+    // Dump tail
+
+    tailbits = (max % 4) * 6;
+
+    if (tailbits === 0) {
+      result.push((bits >> 16) & 0xFF);
+      result.push((bits >> 8) & 0xFF);
+      result.push(bits & 0xFF);
+    } else if (tailbits === 18) {
+      result.push((bits >> 10) & 0xFF);
+      result.push((bits >> 2) & 0xFF);
+    } else if (tailbits === 12) {
+      result.push((bits >> 4) & 0xFF);
+    }
+
+    return new Uint8Array(result);
+  }
+
+  function representYamlBinary(object /*, style*/) {
+    var result = '', bits = 0, idx, tail,
+        max = object.length,
+        map = BASE64_MAP;
+
+    // Convert every three bytes to 4 ASCII characters.
+
+    for (idx = 0; idx < max; idx++) {
+      if ((idx % 3 === 0) && idx) {
+        result += map[(bits >> 18) & 0x3F];
+        result += map[(bits >> 12) & 0x3F];
+        result += map[(bits >> 6) & 0x3F];
+        result += map[bits & 0x3F];
+      }
+
+      bits = (bits << 8) + object[idx];
+    }
+
+    // Dump tail
+
+    tail = max % 3;
+
+    if (tail === 0) {
+      result += map[(bits >> 18) & 0x3F];
+      result += map[(bits >> 12) & 0x3F];
+      result += map[(bits >> 6) & 0x3F];
+      result += map[bits & 0x3F];
+    } else if (tail === 2) {
+      result += map[(bits >> 10) & 0x3F];
+      result += map[(bits >> 4) & 0x3F];
+      result += map[(bits << 2) & 0x3F];
+      result += map[64];
+    } else if (tail === 1) {
+      result += map[(bits >> 2) & 0x3F];
+      result += map[(bits << 4) & 0x3F];
+      result += map[64];
+      result += map[64];
+    }
+
+    return result;
+  }
+
+  function isBinary(obj) {
+    return Object.prototype.toString.call(obj) ===  '[object Uint8Array]';
+  }
+
+  var binary = new type('tag:yaml.org,2002:binary', {
+    kind: 'scalar',
+    resolve: resolveYamlBinary,
+    construct: constructYamlBinary,
+    predicate: isBinary,
+    represent: representYamlBinary
+  });
+
+  var _hasOwnProperty$3 = Object.prototype.hasOwnProperty;
+  var _toString$2       = Object.prototype.toString;
+
+  function resolveYamlOmap(data) {
+    if (data === null) return true;
+
+    var objectKeys = [], index, length, pair, pairKey, pairHasKey,
+        object = data;
+
+    for (index = 0, length = object.length; index < length; index += 1) {
+      pair = object[index];
+      pairHasKey = false;
+
+      if (_toString$2.call(pair) !== '[object Object]') return false;
+
+      for (pairKey in pair) {
+        if (_hasOwnProperty$3.call(pair, pairKey)) {
+          if (!pairHasKey) pairHasKey = true;
+          else return false;
+        }
+      }
+
+      if (!pairHasKey) return false;
+
+      if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
+      else return false;
+    }
+
+    return true;
+  }
+
+  function constructYamlOmap(data) {
+    return data !== null ? data : [];
+  }
+
+  var omap = new type('tag:yaml.org,2002:omap', {
+    kind: 'sequence',
+    resolve: resolveYamlOmap,
+    construct: constructYamlOmap
+  });
+
+  var _toString$1 = Object.prototype.toString;
+
+  function resolveYamlPairs(data) {
+    if (data === null) return true;
+
+    var index, length, pair, keys, result,
+        object = data;
+
+    result = new Array(object.length);
+
+    for (index = 0, length = object.length; index < length; index += 1) {
+      pair = object[index];
+
+      if (_toString$1.call(pair) !== '[object Object]') return false;
+
+      keys = Object.keys(pair);
+
+      if (keys.length !== 1) return false;
+
+      result[index] = [ keys[0], pair[keys[0]] ];
+    }
+
+    return true;
+  }
+
+  function constructYamlPairs(data) {
+    if (data === null) return [];
+
+    var index, length, pair, keys, result,
+        object = data;
+
+    result = new Array(object.length);
+
+    for (index = 0, length = object.length; index < length; index += 1) {
+      pair = object[index];
+
+      keys = Object.keys(pair);
+
+      result[index] = [ keys[0], pair[keys[0]] ];
+    }
+
+    return result;
+  }
+
+  var pairs = new type('tag:yaml.org,2002:pairs', {
+    kind: 'sequence',
+    resolve: resolveYamlPairs,
+    construct: constructYamlPairs
+  });
+
+  var _hasOwnProperty$2 = Object.prototype.hasOwnProperty;
+
+  function resolveYamlSet(data) {
+    if (data === null) return true;
+
+    var key, object = data;
+
+    for (key in object) {
+      if (_hasOwnProperty$2.call(object, key)) {
+        if (object[key] !== null) return false;
+      }
+    }
+
+    return true;
+  }
+
+  function constructYamlSet(data) {
+    return data !== null ? data : {};
+  }
+
+  var set = new type('tag:yaml.org,2002:set', {
+    kind: 'mapping',
+    resolve: resolveYamlSet,
+    construct: constructYamlSet
+  });
+
+  var _default = core.extend({
+    implicit: [
+      timestamp,
+      merge
+    ],
+    explicit: [
+      binary,
+      omap,
+      pairs,
+      set
+    ]
+  });
+
+  /*eslint-disable max-len,no-use-before-define*/
+
+
+
+
+
+
+
+  var _hasOwnProperty$1 = Object.prototype.hasOwnProperty;
+
+
+  var CONTEXT_FLOW_IN   = 1;
+  var CONTEXT_FLOW_OUT  = 2;
+  var CONTEXT_BLOCK_IN  = 3;
+  var CONTEXT_BLOCK_OUT = 4;
+
+
+  var CHOMPING_CLIP  = 1;
+  var CHOMPING_STRIP = 2;
+  var CHOMPING_KEEP  = 3;
+
+
+  var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
+  var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
+  var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
+  var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
+  var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
+
+
+  function _class(obj) { return Object.prototype.toString.call(obj); }
+
+  function is_EOL(c) {
+    return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
+  }
+
+  function is_WHITE_SPACE(c) {
+    return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
+  }
+
+  function is_WS_OR_EOL(c) {
+    return (c === 0x09/* Tab */) ||
+           (c === 0x20/* Space */) ||
+           (c === 0x0A/* LF */) ||
+           (c === 0x0D/* CR */);
+  }
+
+  function is_FLOW_INDICATOR(c) {
+    return c === 0x2C/* , */ ||
+           c === 0x5B/* [ */ ||
+           c === 0x5D/* ] */ ||
+           c === 0x7B/* { */ ||
+           c === 0x7D/* } */;
+  }
+
+  function fromHexCode(c) {
+    var lc;
+
+    if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+      return c - 0x30;
+    }
+
+    /*eslint-disable no-bitwise*/
+    lc = c | 0x20;
+
+    if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
+      return lc - 0x61 + 10;
+    }
+
+    return -1;
+  }
+
+  function escapedHexLen(c) {
+    if (c === 0x78/* x */) { return 2; }
+    if (c === 0x75/* u */) { return 4; }
+    if (c === 0x55/* U */) { return 8; }
+    return 0;
+  }
+
+  function fromDecimalCode(c) {
+    if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+      return c - 0x30;
+    }
+
+    return -1;
+  }
+
+  function simpleEscapeSequence(c) {
+    /* eslint-disable indent */
+    return (c === 0x30/* 0 */) ? '\x00' :
+          (c === 0x61/* a */) ? '\x07' :
+          (c === 0x62/* b */) ? '\x08' :
+          (c === 0x74/* t */) ? '\x09' :
+          (c === 0x09/* Tab */) ? '\x09' :
+          (c === 0x6E/* n */) ? '\x0A' :
+          (c === 0x76/* v */) ? '\x0B' :
+          (c === 0x66/* f */) ? '\x0C' :
+          (c === 0x72/* r */) ? '\x0D' :
+          (c === 0x65/* e */) ? '\x1B' :
+          (c === 0x20/* Space */) ? ' ' :
+          (c === 0x22/* " */) ? '\x22' :
+          (c === 0x2F/* / */) ? '/' :
+          (c === 0x5C/* \ */) ? '\x5C' :
+          (c === 0x4E/* N */) ? '\x85' :
+          (c === 0x5F/* _ */) ? '\xA0' :
+          (c === 0x4C/* L */) ? '\u2028' :
+          (c === 0x50/* P */) ? '\u2029' : '';
+  }
+
+  function charFromCodepoint(c) {
+    if (c <= 0xFFFF) {
+      return String.fromCharCode(c);
+    }
+    // Encode UTF-16 surrogate pair
+    // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
+    return String.fromCharCode(
+      ((c - 0x010000) >> 10) + 0xD800,
+      ((c - 0x010000) & 0x03FF) + 0xDC00
+    );
+  }
+
+  var simpleEscapeCheck = new Array(256); // integer, for fast access
+  var simpleEscapeMap = new Array(256);
+  for (var i = 0; i < 256; i++) {
+    simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
+    simpleEscapeMap[i] = simpleEscapeSequence(i);
+  }
+
+
+  function State$1(input, options) {
+    this.input = input;
+
+    this.filename  = options['filename']  || null;
+    this.schema    = options['schema']    || _default;
+    this.onWarning = options['onWarning'] || null;
+    // (Hidden) Remove? makes the loader to expect YAML 1.1 documents
+    // if such documents have no explicit %YAML directive
+    this.legacy    = options['legacy']    || false;
+
+    this.json      = options['json']      || false;
+    this.listener  = options['listener']  || null;
+
+    this.implicitTypes = this.schema.compiledImplicit;
+    this.typeMap       = this.schema.compiledTypeMap;
+
+    this.length     = input.length;
+    this.position   = 0;
+    this.line       = 0;
+    this.lineStart  = 0;
+    this.lineIndent = 0;
+
+    // position of first leading tab in the current line,
+    // used to make sure there are no tabs in the indentation
+    this.firstTabInLine = -1;
+
+    this.documents = [];
+
+    /*
+    this.version;
+    this.checkLineBreaks;
+    this.tagMap;
+    this.anchorMap;
+    this.tag;
+    this.anchor;
+    this.kind;
+    this.result;*/
+
+  }
+
+
+  function generateError(state, message) {
+    var mark = {
+      name:     state.filename,
+      buffer:   state.input.slice(0, -1), // omit trailing \0
+      position: state.position,
+      line:     state.line,
+      column:   state.position - state.lineStart
+    };
+
+    mark.snippet = snippet(mark);
+
+    return new exception(message, mark);
+  }
+
+  function throwError(state, message) {
+    throw generateError(state, message);
+  }
+
+  function throwWarning(state, message) {
+    if (state.onWarning) {
+      state.onWarning.call(null, generateError(state, message));
+    }
+  }
+
+
+  var directiveHandlers = {
+
+    YAML: function handleYamlDirective(state, name, args) {
+
+      var match, major, minor;
+
+      if (state.version !== null) {
+        throwError(state, 'duplication of %YAML directive');
+      }
+
+      if (args.length !== 1) {
+        throwError(state, 'YAML directive accepts exactly one argument');
+      }
+
+      match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
+
+      if (match === null) {
+        throwError(state, 'ill-formed argument of the YAML directive');
+      }
+
+      major = parseInt(match[1], 10);
+      minor = parseInt(match[2], 10);
+
+      if (major !== 1) {
+        throwError(state, 'unacceptable YAML version of the document');
+      }
+
+      state.version = args[0];
+      state.checkLineBreaks = (minor < 2);
+
+      if (minor !== 1 && minor !== 2) {
+        throwWarning(state, 'unsupported YAML version of the document');
+      }
+    },
+
+    TAG: function handleTagDirective(state, name, args) {
+
+      var handle, prefix;
+
+      if (args.length !== 2) {
+        throwError(state, 'TAG directive accepts exactly two arguments');
+      }
+
+      handle = args[0];
+      prefix = args[1];
+
+      if (!PATTERN_TAG_HANDLE.test(handle)) {
+        throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
+      }
+
+      if (_hasOwnProperty$1.call(state.tagMap, handle)) {
+        throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
+      }
+
+      if (!PATTERN_TAG_URI.test(prefix)) {
+        throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
+      }
+
+      try {
+        prefix = decodeURIComponent(prefix);
+      } catch (err) {
+        throwError(state, 'tag prefix is malformed: ' + prefix);
+      }
+
+      state.tagMap[handle] = prefix;
+    }
+  };
+
+
+  function captureSegment(state, start, end, checkJson) {
+    var _position, _length, _character, _result;
+
+    if (start < end) {
+      _result = state.input.slice(start, end);
+
+      if (checkJson) {
+        for (_position = 0, _length = _result.length; _position < _length; _position += 1) {
+          _character = _result.charCodeAt(_position);
+          if (!(_character === 0x09 ||
+                (0x20 <= _character && _character <= 0x10FFFF))) {
+            throwError(state, 'expected valid JSON character');
+          }
+        }
+      } else if (PATTERN_NON_PRINTABLE.test(_result)) {
+        throwError(state, 'the stream contains non-printable characters');
+      }
+
+      state.result += _result;
+    }
+  }
+
+  function mergeMappings(state, destination, source, overridableKeys) {
+    var sourceKeys, key, index, quantity;
+
+    if (!common.isObject(source)) {
+      throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
+    }
+
+    sourceKeys = Object.keys(source);
+
+    for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
+      key = sourceKeys[index];
+
+      if (!_hasOwnProperty$1.call(destination, key)) {
+        destination[key] = source[key];
+        overridableKeys[key] = true;
+      }
+    }
+  }
+
+  function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode,
+    startLine, startLineStart, startPos) {
+
+    var index, quantity;
+
+    // The output is a plain object here, so keys can only be strings.
+    // We need to convert keyNode to a string, but doing so can hang the process
+    // (deeply nested arrays that explode exponentially using aliases).
+    if (Array.isArray(keyNode)) {
+      keyNode = Array.prototype.slice.call(keyNode);
+
+      for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
+        if (Array.isArray(keyNode[index])) {
+          throwError(state, 'nested arrays are not supported inside keys');
+        }
+
+        if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
+          keyNode[index] = '[object Object]';
+        }
+      }
+    }
+
+    // Avoid code execution in load() via toString property
+    // (still use its own toString for arrays, timestamps,
+    // and whatever user schema extensions happen to have @@toStringTag)
+    if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
+      keyNode = '[object Object]';
+    }
+
+
+    keyNode = String(keyNode);
+
+    if (_result === null) {
+      _result = {};
+    }
+
+    if (keyTag === 'tag:yaml.org,2002:merge') {
+      if (Array.isArray(valueNode)) {
+        for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
+          mergeMappings(state, _result, valueNode[index], overridableKeys);
+        }
+      } else {
+        mergeMappings(state, _result, valueNode, overridableKeys);
+      }
+    } else {
+      if (!state.json &&
+          !_hasOwnProperty$1.call(overridableKeys, keyNode) &&
+          _hasOwnProperty$1.call(_result, keyNode)) {
+        state.line = startLine || state.line;
+        state.lineStart = startLineStart || state.lineStart;
+        state.position = startPos || state.position;
+        throwError(state, 'duplicated mapping key');
+      }
+
+      // used for this specific key only because Object.defineProperty is slow
+      if (keyNode === '__proto__') {
+        Object.defineProperty(_result, keyNode, {
+          configurable: true,
+          enumerable: true,
+          writable: true,
+          value: valueNode
+        });
+      } else {
+        _result[keyNode] = valueNode;
+      }
+      delete overridableKeys[keyNode];
+    }
+
+    return _result;
+  }
+
+  function readLineBreak(state) {
+    var ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x0A/* LF */) {
+      state.position++;
+    } else if (ch === 0x0D/* CR */) {
+      state.position++;
+      if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
+        state.position++;
+      }
+    } else {
+      throwError(state, 'a line break is expected');
+    }
+
+    state.line += 1;
+    state.lineStart = state.position;
+    state.firstTabInLine = -1;
+  }
+
+  function skipSeparationSpace(state, allowComments, checkIndent) {
+    var lineBreaks = 0,
+        ch = state.input.charCodeAt(state.position);
+
+    while (ch !== 0) {
+      while (is_WHITE_SPACE(ch)) {
+        if (ch === 0x09/* Tab */ && state.firstTabInLine === -1) {
+          state.firstTabInLine = state.position;
+        }
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      if (allowComments && ch === 0x23/* # */) {
+        do {
+          ch = state.input.charCodeAt(++state.position);
+        } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
+      }
+
+      if (is_EOL(ch)) {
+        readLineBreak(state);
+
+        ch = state.input.charCodeAt(state.position);
+        lineBreaks++;
+        state.lineIndent = 0;
+
+        while (ch === 0x20/* Space */) {
+          state.lineIndent++;
+          ch = state.input.charCodeAt(++state.position);
+        }
+      } else {
+        break;
+      }
+    }
+
+    if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
+      throwWarning(state, 'deficient indentation');
+    }
+
+    return lineBreaks;
+  }
+
+  function testDocumentSeparator(state) {
+    var _position = state.position,
+        ch;
+
+    ch = state.input.charCodeAt(_position);
+
+    // Condition state.position === state.lineStart is tested
+    // in parent on each call, for efficiency. No needs to test here again.
+    if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
+        ch === state.input.charCodeAt(_position + 1) &&
+        ch === state.input.charCodeAt(_position + 2)) {
+
+      _position += 3;
+
+      ch = state.input.charCodeAt(_position);
+
+      if (ch === 0 || is_WS_OR_EOL(ch)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  function writeFoldedLines(state, count) {
+    if (count === 1) {
+      state.result += ' ';
+    } else if (count > 1) {
+      state.result += common.repeat('\n', count - 1);
+    }
+  }
+
+
+  function readPlainScalar(state, nodeIndent, withinFlowCollection) {
+    var preceding,
+        following,
+        captureStart,
+        captureEnd,
+        hasPendingContent,
+        _line,
+        _lineStart,
+        _lineIndent,
+        _kind = state.kind,
+        _result = state.result,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (is_WS_OR_EOL(ch)      ||
+        is_FLOW_INDICATOR(ch) ||
+        ch === 0x23/* # */    ||
+        ch === 0x26/* & */    ||
+        ch === 0x2A/* * */    ||
+        ch === 0x21/* ! */    ||
+        ch === 0x7C/* | */    ||
+        ch === 0x3E/* > */    ||
+        ch === 0x27/* ' */    ||
+        ch === 0x22/* " */    ||
+        ch === 0x25/* % */    ||
+        ch === 0x40/* @ */    ||
+        ch === 0x60/* ` */) {
+      return false;
+    }
+
+    if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following) ||
+          withinFlowCollection && is_FLOW_INDICATOR(following)) {
+        return false;
+      }
+    }
+
+    state.kind = 'scalar';
+    state.result = '';
+    captureStart = captureEnd = state.position;
+    hasPendingContent = false;
+
+    while (ch !== 0) {
+      if (ch === 0x3A/* : */) {
+        following = state.input.charCodeAt(state.position + 1);
+
+        if (is_WS_OR_EOL(following) ||
+            withinFlowCollection && is_FLOW_INDICATOR(following)) {
+          break;
+        }
+
+      } else if (ch === 0x23/* # */) {
+        preceding = state.input.charCodeAt(state.position - 1);
+
+        if (is_WS_OR_EOL(preceding)) {
+          break;
+        }
+
+      } else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
+                 withinFlowCollection && is_FLOW_INDICATOR(ch)) {
+        break;
+
+      } else if (is_EOL(ch)) {
+        _line = state.line;
+        _lineStart = state.lineStart;
+        _lineIndent = state.lineIndent;
+        skipSeparationSpace(state, false, -1);
+
+        if (state.lineIndent >= nodeIndent) {
+          hasPendingContent = true;
+          ch = state.input.charCodeAt(state.position);
+          continue;
+        } else {
+          state.position = captureEnd;
+          state.line = _line;
+          state.lineStart = _lineStart;
+          state.lineIndent = _lineIndent;
+          break;
+        }
+      }
+
+      if (hasPendingContent) {
+        captureSegment(state, captureStart, captureEnd, false);
+        writeFoldedLines(state, state.line - _line);
+        captureStart = captureEnd = state.position;
+        hasPendingContent = false;
+      }
+
+      if (!is_WHITE_SPACE(ch)) {
+        captureEnd = state.position + 1;
+      }
+
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    captureSegment(state, captureStart, captureEnd, false);
+
+    if (state.result) {
+      return true;
+    }
+
+    state.kind = _kind;
+    state.result = _result;
+    return false;
+  }
+
+  function readSingleQuotedScalar(state, nodeIndent) {
+    var ch,
+        captureStart, captureEnd;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch !== 0x27/* ' */) {
+      return false;
+    }
+
+    state.kind = 'scalar';
+    state.result = '';
+    state.position++;
+    captureStart = captureEnd = state.position;
+
+    while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+      if (ch === 0x27/* ' */) {
+        captureSegment(state, captureStart, state.position, true);
+        ch = state.input.charCodeAt(++state.position);
+
+        if (ch === 0x27/* ' */) {
+          captureStart = state.position;
+          state.position++;
+          captureEnd = state.position;
+        } else {
+          return true;
+        }
+
+      } else if (is_EOL(ch)) {
+        captureSegment(state, captureStart, captureEnd, true);
+        writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+        captureStart = captureEnd = state.position;
+
+      } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+        throwError(state, 'unexpected end of the document within a single quoted scalar');
+
+      } else {
+        state.position++;
+        captureEnd = state.position;
+      }
+    }
+
+    throwError(state, 'unexpected end of the stream within a single quoted scalar');
+  }
+
+  function readDoubleQuotedScalar(state, nodeIndent) {
+    var captureStart,
+        captureEnd,
+        hexLength,
+        hexResult,
+        tmp,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch !== 0x22/* " */) {
+      return false;
+    }
+
+    state.kind = 'scalar';
+    state.result = '';
+    state.position++;
+    captureStart = captureEnd = state.position;
+
+    while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+      if (ch === 0x22/* " */) {
+        captureSegment(state, captureStart, state.position, true);
+        state.position++;
+        return true;
+
+      } else if (ch === 0x5C/* \ */) {
+        captureSegment(state, captureStart, state.position, true);
+        ch = state.input.charCodeAt(++state.position);
+
+        if (is_EOL(ch)) {
+          skipSeparationSpace(state, false, nodeIndent);
+
+          // TODO: rework to inline fn with no type cast?
+        } else if (ch < 256 && simpleEscapeCheck[ch]) {
+          state.result += simpleEscapeMap[ch];
+          state.position++;
+
+        } else if ((tmp = escapedHexLen(ch)) > 0) {
+          hexLength = tmp;
+          hexResult = 0;
+
+          for (; hexLength > 0; hexLength--) {
+            ch = state.input.charCodeAt(++state.position);
+
+            if ((tmp = fromHexCode(ch)) >= 0) {
+              hexResult = (hexResult << 4) + tmp;
+
+            } else {
+              throwError(state, 'expected hexadecimal character');
+            }
+          }
+
+          state.result += charFromCodepoint(hexResult);
+
+          state.position++;
+
+        } else {
+          throwError(state, 'unknown escape sequence');
+        }
+
+        captureStart = captureEnd = state.position;
+
+      } else if (is_EOL(ch)) {
+        captureSegment(state, captureStart, captureEnd, true);
+        writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+        captureStart = captureEnd = state.position;
+
+      } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+        throwError(state, 'unexpected end of the document within a double quoted scalar');
+
+      } else {
+        state.position++;
+        captureEnd = state.position;
+      }
+    }
+
+    throwError(state, 'unexpected end of the stream within a double quoted scalar');
+  }
+
+  function readFlowCollection(state, nodeIndent) {
+    var readNext = true,
+        _line,
+        _lineStart,
+        _pos,
+        _tag     = state.tag,
+        _result,
+        _anchor  = state.anchor,
+        following,
+        terminator,
+        isPair,
+        isExplicitPair,
+        isMapping,
+        overridableKeys = Object.create(null),
+        keyNode,
+        keyTag,
+        valueNode,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x5B/* [ */) {
+      terminator = 0x5D;/* ] */
+      isMapping = false;
+      _result = [];
+    } else if (ch === 0x7B/* { */) {
+      terminator = 0x7D;/* } */
+      isMapping = true;
+      _result = {};
+    } else {
+      return false;
+    }
+
+    if (state.anchor !== null) {
+      state.anchorMap[state.anchor] = _result;
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+
+    while (ch !== 0) {
+      skipSeparationSpace(state, true, nodeIndent);
+
+      ch = state.input.charCodeAt(state.position);
+
+      if (ch === terminator) {
+        state.position++;
+        state.tag = _tag;
+        state.anchor = _anchor;
+        state.kind = isMapping ? 'mapping' : 'sequence';
+        state.result = _result;
+        return true;
+      } else if (!readNext) {
+        throwError(state, 'missed comma between flow collection entries');
+      } else if (ch === 0x2C/* , */) {
+        // "flow collection entries can never be completely empty", as per YAML 1.2, section 7.4
+        throwError(state, "expected the node content, but found ','");
+      }
+
+      keyTag = keyNode = valueNode = null;
+      isPair = isExplicitPair = false;
+
+      if (ch === 0x3F/* ? */) {
+        following = state.input.charCodeAt(state.position + 1);
+
+        if (is_WS_OR_EOL(following)) {
+          isPair = isExplicitPair = true;
+          state.position++;
+          skipSeparationSpace(state, true, nodeIndent);
+        }
+      }
+
+      _line = state.line; // Save the current line.
+      _lineStart = state.lineStart;
+      _pos = state.position;
+      composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+      keyTag = state.tag;
+      keyNode = state.result;
+      skipSeparationSpace(state, true, nodeIndent);
+
+      ch = state.input.charCodeAt(state.position);
+
+      if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
+        isPair = true;
+        ch = state.input.charCodeAt(++state.position);
+        skipSeparationSpace(state, true, nodeIndent);
+        composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+        valueNode = state.result;
+      }
+
+      if (isMapping) {
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos);
+      } else if (isPair) {
+        _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos));
+      } else {
+        _result.push(keyNode);
+      }
+
+      skipSeparationSpace(state, true, nodeIndent);
+
+      ch = state.input.charCodeAt(state.position);
+
+      if (ch === 0x2C/* , */) {
+        readNext = true;
+        ch = state.input.charCodeAt(++state.position);
+      } else {
+        readNext = false;
+      }
+    }
+
+    throwError(state, 'unexpected end of the stream within a flow collection');
+  }
+
+  function readBlockScalar(state, nodeIndent) {
+    var captureStart,
+        folding,
+        chomping       = CHOMPING_CLIP,
+        didReadContent = false,
+        detectedIndent = false,
+        textIndent     = nodeIndent,
+        emptyLines     = 0,
+        atMoreIndented = false,
+        tmp,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x7C/* | */) {
+      folding = false;
+    } else if (ch === 0x3E/* > */) {
+      folding = true;
+    } else {
+      return false;
+    }
+
+    state.kind = 'scalar';
+    state.result = '';
+
+    while (ch !== 0) {
+      ch = state.input.charCodeAt(++state.position);
+
+      if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
+        if (CHOMPING_CLIP === chomping) {
+          chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
+        } else {
+          throwError(state, 'repeat of a chomping mode identifier');
+        }
+
+      } else if ((tmp = fromDecimalCode(ch)) >= 0) {
+        if (tmp === 0) {
+          throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
+        } else if (!detectedIndent) {
+          textIndent = nodeIndent + tmp - 1;
+          detectedIndent = true;
+        } else {
+          throwError(state, 'repeat of an indentation width identifier');
+        }
+
+      } else {
+        break;
+      }
+    }
+
+    if (is_WHITE_SPACE(ch)) {
+      do { ch = state.input.charCodeAt(++state.position); }
+      while (is_WHITE_SPACE(ch));
+
+      if (ch === 0x23/* # */) {
+        do { ch = state.input.charCodeAt(++state.position); }
+        while (!is_EOL(ch) && (ch !== 0));
+      }
+    }
+
+    while (ch !== 0) {
+      readLineBreak(state);
+      state.lineIndent = 0;
+
+      ch = state.input.charCodeAt(state.position);
+
+      while ((!detectedIndent || state.lineIndent < textIndent) &&
+             (ch === 0x20/* Space */)) {
+        state.lineIndent++;
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      if (!detectedIndent && state.lineIndent > textIndent) {
+        textIndent = state.lineIndent;
+      }
+
+      if (is_EOL(ch)) {
+        emptyLines++;
+        continue;
+      }
+
+      // End of the scalar.
+      if (state.lineIndent < textIndent) {
+
+        // Perform the chomping.
+        if (chomping === CHOMPING_KEEP) {
+          state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+        } else if (chomping === CHOMPING_CLIP) {
+          if (didReadContent) { // i.e. only if the scalar is not empty.
+            state.result += '\n';
+          }
+        }
+
+        // Break this `while` cycle and go to the funciton's epilogue.
+        break;
+      }
+
+      // Folded style: use fancy rules to handle line breaks.
+      if (folding) {
+
+        // Lines starting with white space characters (more-indented lines) are not folded.
+        if (is_WHITE_SPACE(ch)) {
+          atMoreIndented = true;
+          // except for the first content line (cf. Example 8.1)
+          state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+
+        // End of more-indented block.
+        } else if (atMoreIndented) {
+          atMoreIndented = false;
+          state.result += common.repeat('\n', emptyLines + 1);
+
+        // Just one line break - perceive as the same line.
+        } else if (emptyLines === 0) {
+          if (didReadContent) { // i.e. only if we have already read some scalar content.
+            state.result += ' ';
+          }
+
+        // Several line breaks - perceive as different lines.
+        } else {
+          state.result += common.repeat('\n', emptyLines);
+        }
+
+      // Literal style: just add exact number of line breaks between content lines.
+      } else {
+        // Keep all line breaks except the header line break.
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+      }
+
+      didReadContent = true;
+      detectedIndent = true;
+      emptyLines = 0;
+      captureStart = state.position;
+
+      while (!is_EOL(ch) && (ch !== 0)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      captureSegment(state, captureStart, state.position, false);
+    }
+
+    return true;
+  }
+
+  function readBlockSequence(state, nodeIndent) {
+    var _line,
+        _tag      = state.tag,
+        _anchor   = state.anchor,
+        _result   = [],
+        following,
+        detected  = false,
+        ch;
+
+    // there is a leading tab before this token, so it can't be a block sequence/mapping;
+    // it can still be flow sequence/mapping or a scalar
+    if (state.firstTabInLine !== -1) return false;
+
+    if (state.anchor !== null) {
+      state.anchorMap[state.anchor] = _result;
+    }
+
+    ch = state.input.charCodeAt(state.position);
+
+    while (ch !== 0) {
+      if (state.firstTabInLine !== -1) {
+        state.position = state.firstTabInLine;
+        throwError(state, 'tab characters must not be used in indentation');
+      }
+
+      if (ch !== 0x2D/* - */) {
+        break;
+      }
+
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (!is_WS_OR_EOL(following)) {
+        break;
+      }
+
+      detected = true;
+      state.position++;
+
+      if (skipSeparationSpace(state, true, -1)) {
+        if (state.lineIndent <= nodeIndent) {
+          _result.push(null);
+          ch = state.input.charCodeAt(state.position);
+          continue;
+        }
+      }
+
+      _line = state.line;
+      composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
+      _result.push(state.result);
+      skipSeparationSpace(state, true, -1);
+
+      ch = state.input.charCodeAt(state.position);
+
+      if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+        throwError(state, 'bad indentation of a sequence entry');
+      } else if (state.lineIndent < nodeIndent) {
+        break;
+      }
+    }
+
+    if (detected) {
+      state.tag = _tag;
+      state.anchor = _anchor;
+      state.kind = 'sequence';
+      state.result = _result;
+      return true;
+    }
+    return false;
+  }
+
+  function readBlockMapping(state, nodeIndent, flowIndent) {
+    var following,
+        allowCompact,
+        _line,
+        _keyLine,
+        _keyLineStart,
+        _keyPos,
+        _tag          = state.tag,
+        _anchor       = state.anchor,
+        _result       = {},
+        overridableKeys = Object.create(null),
+        keyTag        = null,
+        keyNode       = null,
+        valueNode     = null,
+        atExplicitKey = false,
+        detected      = false,
+        ch;
+
+    // there is a leading tab before this token, so it can't be a block sequence/mapping;
+    // it can still be flow sequence/mapping or a scalar
+    if (state.firstTabInLine !== -1) return false;
+
+    if (state.anchor !== null) {
+      state.anchorMap[state.anchor] = _result;
+    }
+
+    ch = state.input.charCodeAt(state.position);
+
+    while (ch !== 0) {
+      if (!atExplicitKey && state.firstTabInLine !== -1) {
+        state.position = state.firstTabInLine;
+        throwError(state, 'tab characters must not be used in indentation');
+      }
+
+      following = state.input.charCodeAt(state.position + 1);
+      _line = state.line; // Save the current line.
+
+      //
+      // Explicit notation case. There are two separate blocks:
+      // first for the key (denoted by "?") and second for the value (denoted by ":")
+      //
+      if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
+
+        if (ch === 0x3F/* ? */) {
+          if (atExplicitKey) {
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+            keyTag = keyNode = valueNode = null;
+          }
+
+          detected = true;
+          atExplicitKey = true;
+          allowCompact = true;
+
+        } else if (atExplicitKey) {
+          // i.e. 0x3A/* : */ === character after the explicit key.
+          atExplicitKey = false;
+          allowCompact = true;
+
+        } else {
+          throwError(state, 'incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line');
+        }
+
+        state.position += 1;
+        ch = following;
+
+      //
+      // Implicit notation case. Flow-style node as the key first, then ":", and the value.
+      //
+      } else {
+        _keyLine = state.line;
+        _keyLineStart = state.lineStart;
+        _keyPos = state.position;
+
+        if (!composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+          // Neither implicit nor explicit notation.
+          // Reading is done. Go to the epilogue.
+          break;
+        }
+
+        if (state.line === _line) {
+          ch = state.input.charCodeAt(state.position);
+
+          while (is_WHITE_SPACE(ch)) {
+            ch = state.input.charCodeAt(++state.position);
+          }
+
+          if (ch === 0x3A/* : */) {
+            ch = state.input.charCodeAt(++state.position);
+
+            if (!is_WS_OR_EOL(ch)) {
+              throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
+            }
+
+            if (atExplicitKey) {
+              storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+              keyTag = keyNode = valueNode = null;
+            }
+
+            detected = true;
+            atExplicitKey = false;
+            allowCompact = false;
+            keyTag = state.tag;
+            keyNode = state.result;
+
+          } else if (detected) {
+            throwError(state, 'can not read an implicit mapping pair; a colon is missed');
+
+          } else {
+            state.tag = _tag;
+            state.anchor = _anchor;
+            return true; // Keep the result of `composeNode`.
+          }
+
+        } else if (detected) {
+          throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');
+
+        } else {
+          state.tag = _tag;
+          state.anchor = _anchor;
+          return true; // Keep the result of `composeNode`.
+        }
+      }
+
+      //
+      // Common reading code for both explicit and implicit notations.
+      //
+      if (state.line === _line || state.lineIndent > nodeIndent) {
+        if (atExplicitKey) {
+          _keyLine = state.line;
+          _keyLineStart = state.lineStart;
+          _keyPos = state.position;
+        }
+
+        if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
+          if (atExplicitKey) {
+            keyNode = state.result;
+          } else {
+            valueNode = state.result;
+          }
+        }
+
+        if (!atExplicitKey) {
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _keyLine, _keyLineStart, _keyPos);
+          keyTag = keyNode = valueNode = null;
+        }
+
+        skipSeparationSpace(state, true, -1);
+        ch = state.input.charCodeAt(state.position);
+      }
+
+      if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+        throwError(state, 'bad indentation of a mapping entry');
+      } else if (state.lineIndent < nodeIndent) {
+        break;
+      }
+    }
+
+    //
+    // Epilogue.
+    //
+
+    // Special case: last mapping's node contains only the key in explicit notation.
+    if (atExplicitKey) {
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+    }
+
+    // Expose the resulting mapping.
+    if (detected) {
+      state.tag = _tag;
+      state.anchor = _anchor;
+      state.kind = 'mapping';
+      state.result = _result;
+    }
+
+    return detected;
+  }
+
+  function readTagProperty(state) {
+    var _position,
+        isVerbatim = false,
+        isNamed    = false,
+        tagHandle,
+        tagName,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch !== 0x21/* ! */) return false;
+
+    if (state.tag !== null) {
+      throwError(state, 'duplication of a tag property');
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+
+    if (ch === 0x3C/* < */) {
+      isVerbatim = true;
+      ch = state.input.charCodeAt(++state.position);
+
+    } else if (ch === 0x21/* ! */) {
+      isNamed = true;
+      tagHandle = '!!';
+      ch = state.input.charCodeAt(++state.position);
+
+    } else {
+      tagHandle = '!';
+    }
+
+    _position = state.position;
+
+    if (isVerbatim) {
+      do { ch = state.input.charCodeAt(++state.position); }
+      while (ch !== 0 && ch !== 0x3E/* > */);
+
+      if (state.position < state.length) {
+        tagName = state.input.slice(_position, state.position);
+        ch = state.input.charCodeAt(++state.position);
+      } else {
+        throwError(state, 'unexpected end of the stream within a verbatim tag');
+      }
+    } else {
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+
+        if (ch === 0x21/* ! */) {
+          if (!isNamed) {
+            tagHandle = state.input.slice(_position - 1, state.position + 1);
+
+            if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
+              throwError(state, 'named tag handle cannot contain such characters');
+            }
+
+            isNamed = true;
+            _position = state.position + 1;
+          } else {
+            throwError(state, 'tag suffix cannot contain exclamation marks');
+          }
+        }
+
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      tagName = state.input.slice(_position, state.position);
+
+      if (PATTERN_FLOW_INDICATORS.test(tagName)) {
+        throwError(state, 'tag suffix cannot contain flow indicator characters');
+      }
+    }
+
+    if (tagName && !PATTERN_TAG_URI.test(tagName)) {
+      throwError(state, 'tag name cannot contain such characters: ' + tagName);
+    }
+
+    try {
+      tagName = decodeURIComponent(tagName);
+    } catch (err) {
+      throwError(state, 'tag name is malformed: ' + tagName);
+    }
+
+    if (isVerbatim) {
+      state.tag = tagName;
+
+    } else if (_hasOwnProperty$1.call(state.tagMap, tagHandle)) {
+      state.tag = state.tagMap[tagHandle] + tagName;
+
+    } else if (tagHandle === '!') {
+      state.tag = '!' + tagName;
+
+    } else if (tagHandle === '!!') {
+      state.tag = 'tag:yaml.org,2002:' + tagName;
+
+    } else {
+      throwError(state, 'undeclared tag handle "' + tagHandle + '"');
+    }
+
+    return true;
+  }
+
+  function readAnchorProperty(state) {
+    var _position,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch !== 0x26/* & */) return false;
+
+    if (state.anchor !== null) {
+      throwError(state, 'duplication of an anchor property');
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+    _position = state.position;
+
+    while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (state.position === _position) {
+      throwError(state, 'name of an anchor node must contain at least one character');
+    }
+
+    state.anchor = state.input.slice(_position, state.position);
+    return true;
+  }
+
+  function readAlias(state) {
+    var _position, alias,
+        ch;
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch !== 0x2A/* * */) return false;
+
+    ch = state.input.charCodeAt(++state.position);
+    _position = state.position;
+
+    while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (state.position === _position) {
+      throwError(state, 'name of an alias node must contain at least one character');
+    }
+
+    alias = state.input.slice(_position, state.position);
+
+    if (!_hasOwnProperty$1.call(state.anchorMap, alias)) {
+      throwError(state, 'unidentified alias "' + alias + '"');
+    }
+
+    state.result = state.anchorMap[alias];
+    skipSeparationSpace(state, true, -1);
+    return true;
+  }
+
+  function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
+    var allowBlockStyles,
+        allowBlockScalars,
+        allowBlockCollections,
+        indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
+        atNewLine  = false,
+        hasContent = false,
+        typeIndex,
+        typeQuantity,
+        typeList,
+        type,
+        flowIndent,
+        blockIndent;
+
+    if (state.listener !== null) {
+      state.listener('open', state);
+    }
+
+    state.tag    = null;
+    state.anchor = null;
+    state.kind   = null;
+    state.result = null;
+
+    allowBlockStyles = allowBlockScalars = allowBlockCollections =
+      CONTEXT_BLOCK_OUT === nodeContext ||
+      CONTEXT_BLOCK_IN  === nodeContext;
+
+    if (allowToSeek) {
+      if (skipSeparationSpace(state, true, -1)) {
+        atNewLine = true;
+
+        if (state.lineIndent > parentIndent) {
+          indentStatus = 1;
+        } else if (state.lineIndent === parentIndent) {
+          indentStatus = 0;
+        } else if (state.lineIndent < parentIndent) {
+          indentStatus = -1;
+        }
+      }
+    }
+
+    if (indentStatus === 1) {
+      while (readTagProperty(state) || readAnchorProperty(state)) {
+        if (skipSeparationSpace(state, true, -1)) {
+          atNewLine = true;
+          allowBlockCollections = allowBlockStyles;
+
+          if (state.lineIndent > parentIndent) {
+            indentStatus = 1;
+          } else if (state.lineIndent === parentIndent) {
+            indentStatus = 0;
+          } else if (state.lineIndent < parentIndent) {
+            indentStatus = -1;
+          }
+        } else {
+          allowBlockCollections = false;
+        }
+      }
+    }
+
+    if (allowBlockCollections) {
+      allowBlockCollections = atNewLine || allowCompact;
+    }
+
+    if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
+      if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
+        flowIndent = parentIndent;
+      } else {
+        flowIndent = parentIndent + 1;
+      }
+
+      blockIndent = state.position - state.lineStart;
+
+      if (indentStatus === 1) {
+        if (allowBlockCollections &&
+            (readBlockSequence(state, blockIndent) ||
+             readBlockMapping(state, blockIndent, flowIndent)) ||
+            readFlowCollection(state, flowIndent)) {
+          hasContent = true;
+        } else {
+          if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
+              readSingleQuotedScalar(state, flowIndent) ||
+              readDoubleQuotedScalar(state, flowIndent)) {
+            hasContent = true;
+
+          } else if (readAlias(state)) {
+            hasContent = true;
+
+            if (state.tag !== null || state.anchor !== null) {
+              throwError(state, 'alias node should not have any properties');
+            }
+
+          } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
+            hasContent = true;
+
+            if (state.tag === null) {
+              state.tag = '?';
+            }
+          }
+
+          if (state.anchor !== null) {
+            state.anchorMap[state.anchor] = state.result;
+          }
+        }
+      } else if (indentStatus === 0) {
+        // Special case: block sequences are allowed to have same indentation level as the parent.
+        // http://www.yaml.org/spec/1.2/spec.html#id2799784
+        hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
+      }
+    }
+
+    if (state.tag === null) {
+      if (state.anchor !== null) {
+        state.anchorMap[state.anchor] = state.result;
+      }
+
+    } else if (state.tag === '?') {
+      // Implicit resolving is not allowed for non-scalar types, and '?'
+      // non-specific tag is only automatically assigned to plain scalars.
+      //
+      // We only need to check kind conformity in case user explicitly assigns '?'
+      // tag, for example like this: "!<?> [0]"
+      //
+      if (state.result !== null && state.kind !== 'scalar') {
+        throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
+      }
+
+      for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
+        type = state.implicitTypes[typeIndex];
+
+        if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
+          state.result = type.construct(state.result);
+          state.tag = type.tag;
+          if (state.anchor !== null) {
+            state.anchorMap[state.anchor] = state.result;
+          }
+          break;
+        }
+      }
+    } else if (state.tag !== '!') {
+      if (_hasOwnProperty$1.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+        type = state.typeMap[state.kind || 'fallback'][state.tag];
+      } else {
+        // looking for multi type
+        type = null;
+        typeList = state.typeMap.multi[state.kind || 'fallback'];
+
+        for (typeIndex = 0, typeQuantity = typeList.length; typeIndex < typeQuantity; typeIndex += 1) {
+          if (state.tag.slice(0, typeList[typeIndex].tag.length) === typeList[typeIndex].tag) {
+            type = typeList[typeIndex];
+            break;
+          }
+        }
+      }
+
+      if (!type) {
+        throwError(state, 'unknown tag !<' + state.tag + '>');
+      }
+
+      if (state.result !== null && type.kind !== state.kind) {
+        throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+      }
+
+      if (!type.resolve(state.result, state.tag)) { // `state.result` updated in resolver if matched
+        throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+      } else {
+        state.result = type.construct(state.result, state.tag);
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    }
+
+    if (state.listener !== null) {
+      state.listener('close', state);
+    }
+    return state.tag !== null ||  state.anchor !== null || hasContent;
+  }
+
+  function readDocument(state) {
+    var documentStart = state.position,
+        _position,
+        directiveName,
+        directiveArgs,
+        hasDirectives = false,
+        ch;
+
+    state.version = null;
+    state.checkLineBreaks = state.legacy;
+    state.tagMap = Object.create(null);
+    state.anchorMap = Object.create(null);
+
+    while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+      skipSeparationSpace(state, true, -1);
+
+      ch = state.input.charCodeAt(state.position);
+
+      if (state.lineIndent > 0 || ch !== 0x25/* % */) {
+        break;
+      }
+
+      hasDirectives = true;
+      ch = state.input.charCodeAt(++state.position);
+      _position = state.position;
+
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      directiveName = state.input.slice(_position, state.position);
+      directiveArgs = [];
+
+      if (directiveName.length < 1) {
+        throwError(state, 'directive name must not be less than one character in length');
+      }
+
+      while (ch !== 0) {
+        while (is_WHITE_SPACE(ch)) {
+          ch = state.input.charCodeAt(++state.position);
+        }
+
+        if (ch === 0x23/* # */) {
+          do { ch = state.input.charCodeAt(++state.position); }
+          while (ch !== 0 && !is_EOL(ch));
+          break;
+        }
+
+        if (is_EOL(ch)) break;
+
+        _position = state.position;
+
+        while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+          ch = state.input.charCodeAt(++state.position);
+        }
+
+        directiveArgs.push(state.input.slice(_position, state.position));
+      }
+
+      if (ch !== 0) readLineBreak(state);
+
+      if (_hasOwnProperty$1.call(directiveHandlers, directiveName)) {
+        directiveHandlers[directiveName](state, directiveName, directiveArgs);
+      } else {
+        throwWarning(state, 'unknown document directive "' + directiveName + '"');
+      }
+    }
+
+    skipSeparationSpace(state, true, -1);
+
+    if (state.lineIndent === 0 &&
+        state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
+        state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
+        state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
+      state.position += 3;
+      skipSeparationSpace(state, true, -1);
+
+    } else if (hasDirectives) {
+      throwError(state, 'directives end mark is expected');
+    }
+
+    composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
+    skipSeparationSpace(state, true, -1);
+
+    if (state.checkLineBreaks &&
+        PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
+      throwWarning(state, 'non-ASCII line breaks are interpreted as content');
+    }
+
+    state.documents.push(state.result);
+
+    if (state.position === state.lineStart && testDocumentSeparator(state)) {
+
+      if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
+        state.position += 3;
+        skipSeparationSpace(state, true, -1);
+      }
+      return;
+    }
+
+    if (state.position < (state.length - 1)) {
+      throwError(state, 'end of the stream or a document separator is expected');
+    } else {
+      return;
+    }
+  }
+
+
+  function loadDocuments(input, options) {
+    input = String(input);
+    options = options || {};
+
+    if (input.length !== 0) {
+
+      // Add tailing `\n` if not exists
+      if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
+          input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
+        input += '\n';
+      }
+
+      // Strip BOM
+      if (input.charCodeAt(0) === 0xFEFF) {
+        input = input.slice(1);
+      }
+    }
+
+    var state = new State$1(input, options);
+
+    var nullpos = input.indexOf('\0');
+
+    if (nullpos !== -1) {
+      state.position = nullpos;
+      throwError(state, 'null byte is not allowed in input');
+    }
+
+    // Use 0 as string terminator. That significantly simplifies bounds check.
+    state.input += '\0';
+
+    while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
+      state.lineIndent += 1;
+      state.position += 1;
+    }
+
+    while (state.position < (state.length - 1)) {
+      readDocument(state);
+    }
+
+    return state.documents;
+  }
+
+
+  function loadAll$1(input, iterator, options) {
+    if (iterator !== null && typeof iterator === 'object' && typeof options === 'undefined') {
+      options = iterator;
+      iterator = null;
+    }
+
+    var documents = loadDocuments(input, options);
+
+    if (typeof iterator !== 'function') {
+      return documents;
+    }
+
+    for (var index = 0, length = documents.length; index < length; index += 1) {
+      iterator(documents[index]);
+    }
+  }
+
+
+  function load$1(input, options) {
+    var documents = loadDocuments(input, options);
+
+    if (documents.length === 0) {
+      /*eslint-disable no-undefined*/
+      return undefined;
+    } else if (documents.length === 1) {
+      return documents[0];
+    }
+    throw new exception('expected a single document in the stream, but found more');
+  }
+
+
+  var loadAll_1 = loadAll$1;
+  var load_1    = load$1;
+
+  var loader = {
+  	loadAll: loadAll_1,
+  	load: load_1
+  };
+
+  /*eslint-disable no-use-before-define*/
+
+
+
+
+
+  var _toString       = Object.prototype.toString;
+  var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+  var CHAR_BOM                  = 0xFEFF;
+  var CHAR_TAB                  = 0x09; /* Tab */
+  var CHAR_LINE_FEED            = 0x0A; /* LF */
+  var CHAR_CARRIAGE_RETURN      = 0x0D; /* CR */
+  var CHAR_SPACE                = 0x20; /* Space */
+  var CHAR_EXCLAMATION          = 0x21; /* ! */
+  var CHAR_DOUBLE_QUOTE         = 0x22; /* " */
+  var CHAR_SHARP                = 0x23; /* # */
+  var CHAR_PERCENT              = 0x25; /* % */
+  var CHAR_AMPERSAND            = 0x26; /* & */
+  var CHAR_SINGLE_QUOTE         = 0x27; /* ' */
+  var CHAR_ASTERISK             = 0x2A; /* * */
+  var CHAR_COMMA                = 0x2C; /* , */
+  var CHAR_MINUS                = 0x2D; /* - */
+  var CHAR_COLON                = 0x3A; /* : */
+  var CHAR_EQUALS               = 0x3D; /* = */
+  var CHAR_GREATER_THAN         = 0x3E; /* > */
+  var CHAR_QUESTION             = 0x3F; /* ? */
+  var CHAR_COMMERCIAL_AT        = 0x40; /* @ */
+  var CHAR_LEFT_SQUARE_BRACKET  = 0x5B; /* [ */
+  var CHAR_RIGHT_SQUARE_BRACKET = 0x5D; /* ] */
+  var CHAR_GRAVE_ACCENT         = 0x60; /* ` */
+  var CHAR_LEFT_CURLY_BRACKET   = 0x7B; /* { */
+  var CHAR_VERTICAL_LINE        = 0x7C; /* | */
+  var CHAR_RIGHT_CURLY_BRACKET  = 0x7D; /* } */
+
+  var ESCAPE_SEQUENCES = {};
+
+  ESCAPE_SEQUENCES[0x00]   = '\\0';
+  ESCAPE_SEQUENCES[0x07]   = '\\a';
+  ESCAPE_SEQUENCES[0x08]   = '\\b';
+  ESCAPE_SEQUENCES[0x09]   = '\\t';
+  ESCAPE_SEQUENCES[0x0A]   = '\\n';
+  ESCAPE_SEQUENCES[0x0B]   = '\\v';
+  ESCAPE_SEQUENCES[0x0C]   = '\\f';
+  ESCAPE_SEQUENCES[0x0D]   = '\\r';
+  ESCAPE_SEQUENCES[0x1B]   = '\\e';
+  ESCAPE_SEQUENCES[0x22]   = '\\"';
+  ESCAPE_SEQUENCES[0x5C]   = '\\\\';
+  ESCAPE_SEQUENCES[0x85]   = '\\N';
+  ESCAPE_SEQUENCES[0xA0]   = '\\_';
+  ESCAPE_SEQUENCES[0x2028] = '\\L';
+  ESCAPE_SEQUENCES[0x2029] = '\\P';
+
+  var DEPRECATED_BOOLEANS_SYNTAX = [
+    'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
+    'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
+  ];
+
+  var DEPRECATED_BASE60_SYNTAX = /^[-+]?[0-9_]+(?::[0-9_]+)+(?:\.[0-9_]*)?$/;
+
+  function compileStyleMap(schema, map) {
+    var result, keys, index, length, tag, style, type;
+
+    if (map === null) return {};
+
+    result = {};
+    keys = Object.keys(map);
+
+    for (index = 0, length = keys.length; index < length; index += 1) {
+      tag = keys[index];
+      style = String(map[tag]);
+
+      if (tag.slice(0, 2) === '!!') {
+        tag = 'tag:yaml.org,2002:' + tag.slice(2);
+      }
+      type = schema.compiledTypeMap['fallback'][tag];
+
+      if (type && _hasOwnProperty.call(type.styleAliases, style)) {
+        style = type.styleAliases[style];
+      }
+
+      result[tag] = style;
+    }
+
+    return result;
+  }
+
+  function encodeHex(character) {
+    var string, handle, length;
+
+    string = character.toString(16).toUpperCase();
+
+    if (character <= 0xFF) {
+      handle = 'x';
+      length = 2;
+    } else if (character <= 0xFFFF) {
+      handle = 'u';
+      length = 4;
+    } else if (character <= 0xFFFFFFFF) {
+      handle = 'U';
+      length = 8;
+    } else {
+      throw new exception('code point within a string may not be greater than 0xFFFFFFFF');
+    }
+
+    return '\\' + handle + common.repeat('0', length - string.length) + string;
+  }
+
+
+  var QUOTING_TYPE_SINGLE = 1,
+      QUOTING_TYPE_DOUBLE = 2;
+
+  function State(options) {
+    this.schema        = options['schema'] || _default;
+    this.indent        = Math.max(1, (options['indent'] || 2));
+    this.noArrayIndent = options['noArrayIndent'] || false;
+    this.skipInvalid   = options['skipInvalid'] || false;
+    this.flowLevel     = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+    this.styleMap      = compileStyleMap(this.schema, options['styles'] || null);
+    this.sortKeys      = options['sortKeys'] || false;
+    this.lineWidth     = options['lineWidth'] || 80;
+    this.noRefs        = options['noRefs'] || false;
+    this.noCompatMode  = options['noCompatMode'] || false;
+    this.condenseFlow  = options['condenseFlow'] || false;
+    this.quotingType   = options['quotingType'] === '"' ? QUOTING_TYPE_DOUBLE : QUOTING_TYPE_SINGLE;
+    this.forceQuotes   = options['forceQuotes'] || false;
+    this.replacer      = typeof options['replacer'] === 'function' ? options['replacer'] : null;
+
+    this.implicitTypes = this.schema.compiledImplicit;
+    this.explicitTypes = this.schema.compiledExplicit;
+
+    this.tag = null;
+    this.result = '';
+
+    this.duplicates = [];
+    this.usedDuplicates = null;
+  }
+
+  // Indents every line in a string. Empty lines (\n only) are not indented.
+  function indentString(string, spaces) {
+    var ind = common.repeat(' ', spaces),
+        position = 0,
+        next = -1,
+        result = '',
+        line,
+        length = string.length;
+
+    while (position < length) {
+      next = string.indexOf('\n', position);
+      if (next === -1) {
+        line = string.slice(position);
+        position = length;
+      } else {
+        line = string.slice(position, next + 1);
+        position = next + 1;
+      }
+
+      if (line.length && line !== '\n') result += ind;
+
+      result += line;
+    }
+
+    return result;
+  }
+
+  function generateNextLine(state, level) {
+    return '\n' + common.repeat(' ', state.indent * level);
+  }
+
+  function testImplicitResolving(state, str) {
+    var index, length, type;
+
+    for (index = 0, length = state.implicitTypes.length; index < length; index += 1) {
+      type = state.implicitTypes[index];
+
+      if (type.resolve(str)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  // [33] s-white ::= s-space | s-tab
+  function isWhitespace(c) {
+    return c === CHAR_SPACE || c === CHAR_TAB;
+  }
+
+  // Returns true if the character can be printed without escaping.
+  // From YAML 1.2: "any allowed characters known to be non-printable
+  // should also be escaped. [However,] This isn’t mandatory"
+  // Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
+  function isPrintable(c) {
+    return  (0x00020 <= c && c <= 0x00007E)
+        || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
+        || ((0x0E000 <= c && c <= 0x00FFFD) && c !== CHAR_BOM)
+        ||  (0x10000 <= c && c <= 0x10FFFF);
+  }
+
+  // [34] ns-char ::= nb-char - s-white
+  // [27] nb-char ::= c-printable - b-char - c-byte-order-mark
+  // [26] b-char  ::= b-line-feed | b-carriage-return
+  // Including s-white (for some reason, examples doesn't match specs in this aspect)
+  // ns-char ::= c-printable - b-line-feed - b-carriage-return - c-byte-order-mark
+  function isNsCharOrWhitespace(c) {
+    return isPrintable(c)
+      && c !== CHAR_BOM
+      // - b-char
+      && c !== CHAR_CARRIAGE_RETURN
+      && c !== CHAR_LINE_FEED;
+  }
+
+  // [127]  ns-plain-safe(c) ::= c = flow-out  ⇒ ns-plain-safe-out
+  //                             c = flow-in   ⇒ ns-plain-safe-in
+  //                             c = block-key ⇒ ns-plain-safe-out
+  //                             c = flow-key  ⇒ ns-plain-safe-in
+  // [128] ns-plain-safe-out ::= ns-char
+  // [129]  ns-plain-safe-in ::= ns-char - c-flow-indicator
+  // [130]  ns-plain-char(c) ::=  ( ns-plain-safe(c) - “:” - “#” )
+  //                            | ( /* An ns-char preceding */ “#” )
+  //                            | ( “:” /* Followed by an ns-plain-safe(c) */ )
+  function isPlainSafe(c, prev, inblock) {
+    var cIsNsCharOrWhitespace = isNsCharOrWhitespace(c);
+    var cIsNsChar = cIsNsCharOrWhitespace && !isWhitespace(c);
+    return (
+      // ns-plain-safe
+      inblock ? // c = flow-in
+        cIsNsCharOrWhitespace
+        : cIsNsCharOrWhitespace
+          // - c-flow-indicator
+          && c !== CHAR_COMMA
+          && c !== CHAR_LEFT_SQUARE_BRACKET
+          && c !== CHAR_RIGHT_SQUARE_BRACKET
+          && c !== CHAR_LEFT_CURLY_BRACKET
+          && c !== CHAR_RIGHT_CURLY_BRACKET
+    )
+      // ns-plain-char
+      && c !== CHAR_SHARP // false on '#'
+      && !(prev === CHAR_COLON && !cIsNsChar) // false on ': '
+      || (isNsCharOrWhitespace(prev) && !isWhitespace(prev) && c === CHAR_SHARP) // change to true on '[^ ]#'
+      || (prev === CHAR_COLON && cIsNsChar); // change to true on ':[^ ]'
+  }
+
+  // Simplified test for values allowed as the first character in plain style.
+  function isPlainSafeFirst(c) {
+    // Uses a subset of ns-char - c-indicator
+    // where ns-char = nb-char - s-white.
+    // No support of ( ( “?” | “:” | “-” ) /* Followed by an ns-plain-safe(c)) */ ) part
+    return isPrintable(c) && c !== CHAR_BOM
+      && !isWhitespace(c) // - s-white
+      // - (c-indicator ::=
+      // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
+      && c !== CHAR_MINUS
+      && c !== CHAR_QUESTION
+      && c !== CHAR_COLON
+      && c !== CHAR_COMMA
+      && c !== CHAR_LEFT_SQUARE_BRACKET
+      && c !== CHAR_RIGHT_SQUARE_BRACKET
+      && c !== CHAR_LEFT_CURLY_BRACKET
+      && c !== CHAR_RIGHT_CURLY_BRACKET
+      // | “#” | “&” | “*” | “!” | “|” | “=” | “>” | “'” | “"”
+      && c !== CHAR_SHARP
+      && c !== CHAR_AMPERSAND
+      && c !== CHAR_ASTERISK
+      && c !== CHAR_EXCLAMATION
+      && c !== CHAR_VERTICAL_LINE
+      && c !== CHAR_EQUALS
+      && c !== CHAR_GREATER_THAN
+      && c !== CHAR_SINGLE_QUOTE
+      && c !== CHAR_DOUBLE_QUOTE
+      // | “%” | “@” | “`”)
+      && c !== CHAR_PERCENT
+      && c !== CHAR_COMMERCIAL_AT
+      && c !== CHAR_GRAVE_ACCENT;
+  }
+
+  // Simplified test for values allowed as the last character in plain style.
+  function isPlainSafeLast(c) {
+    // just not whitespace or colon, it will be checked to be plain character later
+    return !isWhitespace(c) && c !== CHAR_COLON;
+  }
+
+  // Same as 'string'.codePointAt(pos), but works in older browsers.
+  function codePointAt(string, pos) {
+    var first = string.charCodeAt(pos), second;
+    if (first >= 0xD800 && first <= 0xDBFF && pos + 1 < string.length) {
+      second = string.charCodeAt(pos + 1);
+      if (second >= 0xDC00 && second <= 0xDFFF) {
+        // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+        return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+      }
+    }
+    return first;
+  }
+
+  // Determines whether block indentation indicator is required.
+  function needIndentIndicator(string) {
+    var leadingSpaceRe = /^\n* /;
+    return leadingSpaceRe.test(string);
+  }
+
+  var STYLE_PLAIN   = 1,
+      STYLE_SINGLE  = 2,
+      STYLE_LITERAL = 3,
+      STYLE_FOLDED  = 4,
+      STYLE_DOUBLE  = 5;
+
+  // Determines which scalar styles are possible and returns the preferred style.
+  // lineWidth = -1 => no limit.
+  // Pre-conditions: str.length > 0.
+  // Post-conditions:
+  //    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
+  //    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
+  //    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
+  function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth,
+    testAmbiguousType, quotingType, forceQuotes, inblock) {
+
+    var i;
+    var char = 0;
+    var prevChar = null;
+    var hasLineBreak = false;
+    var hasFoldableLine = false; // only checked if shouldTrackWidth
+    var shouldTrackWidth = lineWidth !== -1;
+    var previousLineBreak = -1; // count the first line correctly
+    var plain = isPlainSafeFirst(codePointAt(string, 0))
+            && isPlainSafeLast(codePointAt(string, string.length - 1));
+
+    if (singleLineOnly || forceQuotes) {
+      // Case: no block styles.
+      // Check for disallowed characters to rule out plain and single.
+      for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+        char = codePointAt(string, i);
+        if (!isPrintable(char)) {
+          return STYLE_DOUBLE;
+        }
+        plain = plain && isPlainSafe(char, prevChar, inblock);
+        prevChar = char;
+      }
+    } else {
+      // Case: block styles permitted.
+      for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+        char = codePointAt(string, i);
+        if (char === CHAR_LINE_FEED) {
+          hasLineBreak = true;
+          // Check if any line can be folded.
+          if (shouldTrackWidth) {
+            hasFoldableLine = hasFoldableLine ||
+              // Foldable line = too long, and not more-indented.
+              (i - previousLineBreak - 1 > lineWidth &&
+               string[previousLineBreak + 1] !== ' ');
+            previousLineBreak = i;
+          }
+        } else if (!isPrintable(char)) {
+          return STYLE_DOUBLE;
+        }
+        plain = plain && isPlainSafe(char, prevChar, inblock);
+        prevChar = char;
+      }
+      // in case the end is missing a \n
+      hasFoldableLine = hasFoldableLine || (shouldTrackWidth &&
+        (i - previousLineBreak - 1 > lineWidth &&
+         string[previousLineBreak + 1] !== ' '));
+    }
+    // Although every style can represent \n without escaping, prefer block styles
+    // for multiline, since they're more readable and they don't add empty lines.
+    // Also prefer folding a super-long line.
+    if (!hasLineBreak && !hasFoldableLine) {
+      // Strings interpretable as another type have to be quoted;
+      // e.g. the string 'true' vs. the boolean true.
+      if (plain && !forceQuotes && !testAmbiguousType(string)) {
+        return STYLE_PLAIN;
+      }
+      return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
+    }
+    // Edge case: block indentation indicator can only have one digit.
+    if (indentPerLevel > 9 && needIndentIndicator(string)) {
+      return STYLE_DOUBLE;
+    }
+    // At this point we know block styles are valid.
+    // Prefer literal style unless we want to fold.
+    if (!forceQuotes) {
+      return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+    }
+    return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
+  }
+
+  // Note: line breaking/folding is implemented for only the folded style.
+  // NB. We drop the last trailing newline (if any) of a returned block scalar
+  //  since the dumper adds its own newline. This always works:
+  //    • No ending newline => unaffected; already using strip "-" chomping.
+  //    • Ending newline    => removed then restored.
+  //  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
+  function writeScalar(state, string, level, iskey, inblock) {
+    state.dump = (function () {
+      if (string.length === 0) {
+        return state.quotingType === QUOTING_TYPE_DOUBLE ? '""' : "''";
+      }
+      if (!state.noCompatMode) {
+        if (DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1 || DEPRECATED_BASE60_SYNTAX.test(string)) {
+          return state.quotingType === QUOTING_TYPE_DOUBLE ? ('"' + string + '"') : ("'" + string + "'");
+        }
+      }
+
+      var indent = state.indent * Math.max(1, level); // no 0-indent scalars
+      // As indentation gets deeper, let the width decrease monotonically
+      // to the lower bound min(state.lineWidth, 40).
+      // Note that this implies
+      //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
+      //  state.lineWidth > 40 + state.indent: width decreases until the lower bound.
+      // This behaves better than a constant minimum width which disallows narrower options,
+      // or an indent threshold which causes the width to suddenly increase.
+      var lineWidth = state.lineWidth === -1
+        ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
+
+      // Without knowing if keys are implicit/explicit, assume implicit for safety.
+      var singleLineOnly = iskey
+        // No block styles in flow mode.
+        || (state.flowLevel > -1 && level >= state.flowLevel);
+      function testAmbiguity(string) {
+        return testImplicitResolving(state, string);
+      }
+
+      switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth,
+        testAmbiguity, state.quotingType, state.forceQuotes && !iskey, inblock)) {
+
+        case STYLE_PLAIN:
+          return string;
+        case STYLE_SINGLE:
+          return "'" + string.replace(/'/g, "''") + "'";
+        case STYLE_LITERAL:
+          return '|' + blockHeader(string, state.indent)
+            + dropEndingNewline(indentString(string, indent));
+        case STYLE_FOLDED:
+          return '>' + blockHeader(string, state.indent)
+            + dropEndingNewline(indentString(foldString(string, lineWidth), indent));
+        case STYLE_DOUBLE:
+          return '"' + escapeString(string) + '"';
+        default:
+          throw new exception('impossible error: invalid scalar style');
+      }
+    }());
+  }
+
+  // Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
+  function blockHeader(string, indentPerLevel) {
+    var indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : '';
+
+    // note the special case: the string '\n' counts as a "trailing" empty line.
+    var clip =          string[string.length - 1] === '\n';
+    var keep = clip && (string[string.length - 2] === '\n' || string === '\n');
+    var chomp = keep ? '+' : (clip ? '' : '-');
+
+    return indentIndicator + chomp + '\n';
+  }
+
+  // (See the note for writeScalar.)
+  function dropEndingNewline(string) {
+    return string[string.length - 1] === '\n' ? string.slice(0, -1) : string;
+  }
+
+  // Note: a long line without a suitable break point will exceed the width limit.
+  // Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
+  function foldString(string, width) {
+    // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
+    // unless they're before or after a more-indented line, or at the very
+    // beginning or end, in which case $k$ maps to $k$.
+    // Therefore, parse each chunk as newline(s) followed by a content line.
+    var lineRe = /(\n+)([^\n]*)/g;
+
+    // first line (possibly an empty line)
+    var result = (function () {
+      var nextLF = string.indexOf('\n');
+      nextLF = nextLF !== -1 ? nextLF : string.length;
+      lineRe.lastIndex = nextLF;
+      return foldLine(string.slice(0, nextLF), width);
+    }());
+    // If we haven't reached the first content line yet, don't add an extra \n.
+    var prevMoreIndented = string[0] === '\n' || string[0] === ' ';
+    var moreIndented;
+
+    // rest of the lines
+    var match;
+    while ((match = lineRe.exec(string))) {
+      var prefix = match[1], line = match[2];
+      moreIndented = (line[0] === ' ');
+      result += prefix
+        + (!prevMoreIndented && !moreIndented && line !== ''
+          ? '\n' : '')
+        + foldLine(line, width);
+      prevMoreIndented = moreIndented;
+    }
+
+    return result;
+  }
+
+  // Greedy line breaking.
+  // Picks the longest line under the limit each time,
+  // otherwise settles for the shortest line over the limit.
+  // NB. More-indented lines *cannot* be folded, as that would add an extra \n.
+  function foldLine(line, width) {
+    if (line === '' || line[0] === ' ') return line;
+
+    // Since a more-indented line adds a \n, breaks can't be followed by a space.
+    var breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
+    var match;
+    // start is an inclusive index. end, curr, and next are exclusive.
+    var start = 0, end, curr = 0, next = 0;
+    var result = '';
+
+    // Invariants: 0 <= start <= length-1.
+    //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
+    // Inside the loop:
+    //   A match implies length >= 2, so curr and next are <= length-2.
+    while ((match = breakRe.exec(line))) {
+      next = match.index;
+      // maintain invariant: curr - start <= width
+      if (next - start > width) {
+        end = (curr > start) ? curr : next; // derive end <= length-2
+        result += '\n' + line.slice(start, end);
+        // skip the space that was output as \n
+        start = end + 1;                    // derive start <= length-1
+      }
+      curr = next;
+    }
+
+    // By the invariants, start <= length-1, so there is something left over.
+    // It is either the whole string or a part starting from non-whitespace.
+    result += '\n';
+    // Insert a break if the remainder is too long and there is a break available.
+    if (line.length - start > width && curr > start) {
+      result += line.slice(start, curr) + '\n' + line.slice(curr + 1);
+    } else {
+      result += line.slice(start);
+    }
+
+    return result.slice(1); // drop extra \n joiner
+  }
+
+  // Escapes a double-quoted string.
+  function escapeString(string) {
+    var result = '';
+    var char = 0;
+    var escapeSeq;
+
+    for (var i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+      char = codePointAt(string, i);
+      escapeSeq = ESCAPE_SEQUENCES[char];
+
+      if (!escapeSeq && isPrintable(char)) {
+        result += string[i];
+        if (char >= 0x10000) result += string[i + 1];
+      } else {
+        result += escapeSeq || encodeHex(char);
+      }
+    }
+
+    return result;
+  }
+
+  function writeFlowSequence(state, level, object) {
+    var _result = '',
+        _tag    = state.tag,
+        index,
+        length,
+        value;
+
+    for (index = 0, length = object.length; index < length; index += 1) {
+      value = object[index];
+
+      if (state.replacer) {
+        value = state.replacer.call(object, String(index), value);
+      }
+
+      // Write only valid elements, put null instead of invalid elements.
+      if (writeNode(state, level, value, false, false) ||
+          (typeof value === 'undefined' &&
+           writeNode(state, level, null, false, false))) {
+
+        if (_result !== '') _result += ',' + (!state.condenseFlow ? ' ' : '');
+        _result += state.dump;
+      }
+    }
+
+    state.tag = _tag;
+    state.dump = '[' + _result + ']';
+  }
+
+  function writeBlockSequence(state, level, object, compact) {
+    var _result = '',
+        _tag    = state.tag,
+        index,
+        length,
+        value;
+
+    for (index = 0, length = object.length; index < length; index += 1) {
+      value = object[index];
+
+      if (state.replacer) {
+        value = state.replacer.call(object, String(index), value);
+      }
+
+      // Write only valid elements, put null instead of invalid elements.
+      if (writeNode(state, level + 1, value, true, true, false, true) ||
+          (typeof value === 'undefined' &&
+           writeNode(state, level + 1, null, true, true, false, true))) {
+
+        if (!compact || _result !== '') {
+          _result += generateNextLine(state, level);
+        }
+
+        if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+          _result += '-';
+        } else {
+          _result += '- ';
+        }
+
+        _result += state.dump;
+      }
+    }
+
+    state.tag = _tag;
+    state.dump = _result || '[]'; // Empty sequence if no valid values.
+  }
+
+  function writeFlowMapping(state, level, object) {
+    var _result       = '',
+        _tag          = state.tag,
+        objectKeyList = Object.keys(object),
+        index,
+        length,
+        objectKey,
+        objectValue,
+        pairBuffer;
+
+    for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+
+      pairBuffer = '';
+      if (_result !== '') pairBuffer += ', ';
+
+      if (state.condenseFlow) pairBuffer += '"';
+
+      objectKey = objectKeyList[index];
+      objectValue = object[objectKey];
+
+      if (state.replacer) {
+        objectValue = state.replacer.call(object, objectKey, objectValue);
+      }
+
+      if (!writeNode(state, level, objectKey, false, false)) {
+        continue; // Skip this pair because of invalid key;
+      }
+
+      if (state.dump.length > 1024) pairBuffer += '? ';
+
+      pairBuffer += state.dump + (state.condenseFlow ? '"' : '') + ':' + (state.condenseFlow ? '' : ' ');
+
+      if (!writeNode(state, level, objectValue, false, false)) {
+        continue; // Skip this pair because of invalid value.
+      }
+
+      pairBuffer += state.dump;
+
+      // Both key and value are valid.
+      _result += pairBuffer;
+    }
+
+    state.tag = _tag;
+    state.dump = '{' + _result + '}';
+  }
+
+  function writeBlockMapping(state, level, object, compact) {
+    var _result       = '',
+        _tag          = state.tag,
+        objectKeyList = Object.keys(object),
+        index,
+        length,
+        objectKey,
+        objectValue,
+        explicitPair,
+        pairBuffer;
+
+    // Allow sorting keys so that the output file is deterministic
+    if (state.sortKeys === true) {
+      // Default sorting
+      objectKeyList.sort();
+    } else if (typeof state.sortKeys === 'function') {
+      // Custom sort function
+      objectKeyList.sort(state.sortKeys);
+    } else if (state.sortKeys) {
+      // Something is wrong
+      throw new exception('sortKeys must be a boolean or a function');
+    }
+
+    for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+      pairBuffer = '';
+
+      if (!compact || _result !== '') {
+        pairBuffer += generateNextLine(state, level);
+      }
+
+      objectKey = objectKeyList[index];
+      objectValue = object[objectKey];
+
+      if (state.replacer) {
+        objectValue = state.replacer.call(object, objectKey, objectValue);
+      }
+
+      if (!writeNode(state, level + 1, objectKey, true, true, true)) {
+        continue; // Skip this pair because of invalid key.
+      }
+
+      explicitPair = (state.tag !== null && state.tag !== '?') ||
+                     (state.dump && state.dump.length > 1024);
+
+      if (explicitPair) {
+        if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+          pairBuffer += '?';
+        } else {
+          pairBuffer += '? ';
+        }
+      }
+
+      pairBuffer += state.dump;
+
+      if (explicitPair) {
+        pairBuffer += generateNextLine(state, level);
+      }
+
+      if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
+        continue; // Skip this pair because of invalid value.
+      }
+
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        pairBuffer += ':';
+      } else {
+        pairBuffer += ': ';
+      }
+
+      pairBuffer += state.dump;
+
+      // Both key and value are valid.
+      _result += pairBuffer;
+    }
+
+    state.tag = _tag;
+    state.dump = _result || '{}'; // Empty mapping if no valid pairs.
+  }
+
+  function detectType(state, object, explicit) {
+    var _result, typeList, index, length, type, style;
+
+    typeList = explicit ? state.explicitTypes : state.implicitTypes;
+
+    for (index = 0, length = typeList.length; index < length; index += 1) {
+      type = typeList[index];
+
+      if ((type.instanceOf  || type.predicate) &&
+          (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
+          (!type.predicate  || type.predicate(object))) {
+
+        if (explicit) {
+          if (type.multi && type.representName) {
+            state.tag = type.representName(object);
+          } else {
+            state.tag = type.tag;
+          }
+        } else {
+          state.tag = '?';
+        }
+
+        if (type.represent) {
+          style = state.styleMap[type.tag] || type.defaultStyle;
+
+          if (_toString.call(type.represent) === '[object Function]') {
+            _result = type.represent(object, style);
+          } else if (_hasOwnProperty.call(type.represent, style)) {
+            _result = type.represent[style](object, style);
+          } else {
+            throw new exception('!<' + type.tag + '> tag resolver accepts not "' + style + '" style');
+          }
+
+          state.dump = _result;
+        }
+
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  // Serializes `object` and writes it to global `result`.
+  // Returns true on success, or false on invalid object.
+  //
+  function writeNode(state, level, object, block, compact, iskey, isblockseq) {
+    state.tag = null;
+    state.dump = object;
+
+    if (!detectType(state, object, false)) {
+      detectType(state, object, true);
+    }
+
+    var type = _toString.call(state.dump);
+    var inblock = block;
+    var tagStr;
+
+    if (block) {
+      block = (state.flowLevel < 0 || state.flowLevel > level);
+    }
+
+    var objectOrArray = type === '[object Object]' || type === '[object Array]',
+        duplicateIndex,
+        duplicate;
+
+    if (objectOrArray) {
+      duplicateIndex = state.duplicates.indexOf(object);
+      duplicate = duplicateIndex !== -1;
+    }
+
+    if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
+      compact = false;
+    }
+
+    if (duplicate && state.usedDuplicates[duplicateIndex]) {
+      state.dump = '*ref_' + duplicateIndex;
+    } else {
+      if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
+        state.usedDuplicates[duplicateIndex] = true;
+      }
+      if (type === '[object Object]') {
+        if (block && (Object.keys(state.dump).length !== 0)) {
+          writeBlockMapping(state, level, state.dump, compact);
+          if (duplicate) {
+            state.dump = '&ref_' + duplicateIndex + state.dump;
+          }
+        } else {
+          writeFlowMapping(state, level, state.dump);
+          if (duplicate) {
+            state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+          }
+        }
+      } else if (type === '[object Array]') {
+        if (block && (state.dump.length !== 0)) {
+          if (state.noArrayIndent && !isblockseq && level > 0) {
+            writeBlockSequence(state, level - 1, state.dump, compact);
+          } else {
+            writeBlockSequence(state, level, state.dump, compact);
+          }
+          if (duplicate) {
+            state.dump = '&ref_' + duplicateIndex + state.dump;
+          }
+        } else {
+          writeFlowSequence(state, level, state.dump);
+          if (duplicate) {
+            state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+          }
+        }
+      } else if (type === '[object String]') {
+        if (state.tag !== '?') {
+          writeScalar(state, state.dump, level, iskey, inblock);
+        }
+      } else if (type === '[object Undefined]') {
+        return false;
+      } else {
+        if (state.skipInvalid) return false;
+        throw new exception('unacceptable kind of an object to dump ' + type);
+      }
+
+      if (state.tag !== null && state.tag !== '?') {
+        // Need to encode all characters except those allowed by the spec:
+        //
+        // [35] ns-dec-digit    ::=  [#x30-#x39] /* 0-9 */
+        // [36] ns-hex-digit    ::=  ns-dec-digit
+        //                         | [#x41-#x46] /* A-F */ | [#x61-#x66] /* a-f */
+        // [37] ns-ascii-letter ::=  [#x41-#x5A] /* A-Z */ | [#x61-#x7A] /* a-z */
+        // [38] ns-word-char    ::=  ns-dec-digit | ns-ascii-letter | “-”
+        // [39] ns-uri-char     ::=  “%” ns-hex-digit ns-hex-digit | ns-word-char | “#”
+        //                         | “;” | “/” | “?” | “:” | “@” | “&” | “=” | “+” | “$” | “,”
+        //                         | “_” | “.” | “!” | “~” | “*” | “'” | “(” | “)” | “[” | “]”
+        //
+        // Also need to encode '!' because it has special meaning (end of tag prefix).
+        //
+        tagStr = encodeURI(
+          state.tag[0] === '!' ? state.tag.slice(1) : state.tag
+        ).replace(/!/g, '%21');
+
+        if (state.tag[0] === '!') {
+          tagStr = '!' + tagStr;
+        } else if (tagStr.slice(0, 18) === 'tag:yaml.org,2002:') {
+          tagStr = '!!' + tagStr.slice(18);
+        } else {
+          tagStr = '!<' + tagStr + '>';
+        }
+
+        state.dump = tagStr + ' ' + state.dump;
+      }
+    }
+
+    return true;
+  }
+
+  function getDuplicateReferences(object, state) {
+    var objects = [],
+        duplicatesIndexes = [],
+        index,
+        length;
+
+    inspectNode(object, objects, duplicatesIndexes);
+
+    for (index = 0, length = duplicatesIndexes.length; index < length; index += 1) {
+      state.duplicates.push(objects[duplicatesIndexes[index]]);
+    }
+    state.usedDuplicates = new Array(length);
+  }
+
+  function inspectNode(object, objects, duplicatesIndexes) {
+    var objectKeyList,
+        index,
+        length;
+
+    if (object !== null && typeof object === 'object') {
+      index = objects.indexOf(object);
+      if (index !== -1) {
+        if (duplicatesIndexes.indexOf(index) === -1) {
+          duplicatesIndexes.push(index);
+        }
+      } else {
+        objects.push(object);
+
+        if (Array.isArray(object)) {
+          for (index = 0, length = object.length; index < length; index += 1) {
+            inspectNode(object[index], objects, duplicatesIndexes);
+          }
+        } else {
+          objectKeyList = Object.keys(object);
+
+          for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+            inspectNode(object[objectKeyList[index]], objects, duplicatesIndexes);
+          }
+        }
+      }
+    }
+  }
+
+  function dump$1(input, options) {
+    options = options || {};
+
+    var state = new State(options);
+
+    if (!state.noRefs) getDuplicateReferences(input, state);
+
+    var value = input;
+
+    if (state.replacer) {
+      value = state.replacer.call({ '': value }, '', value);
+    }
+
+    if (writeNode(state, 0, value, true, true)) return state.dump + '\n';
+
+    return '';
+  }
+
+  var dump_1 = dump$1;
+
+  var dumper = {
+  	dump: dump_1
+  };
+
+  function renamed(from, to) {
+    return function () {
+      throw new Error('Function yaml.' + from + ' is removed in js-yaml 4. ' +
+        'Use yaml.' + to + ' instead, which is now safe by default.');
+    };
+  }
+
+
+  var Type                = type;
+  var Schema              = schema;
+  var FAILSAFE_SCHEMA     = failsafe;
+  var JSON_SCHEMA         = json;
+  var CORE_SCHEMA         = core;
+  var DEFAULT_SCHEMA      = _default;
+  var load                = loader.load;
+  var loadAll             = loader.loadAll;
+  var dump                = dumper.dump;
+  var YAMLException       = exception;
+
+  // Re-export all types in case user wants to create custom schema
+  var types = {
+    binary:    binary,
+    float:     float,
+    map:       map,
+    null:      _null,
+    pairs:     pairs,
+    set:       set,
+    timestamp: timestamp,
+    bool:      bool,
+    int:       int,
+    merge:     merge,
+    omap:      omap,
+    seq:       seq,
+    str:       str
+  };
+
+  // Removed functions from JS-YAML 3.0.x
+  var safeLoad            = renamed('safeLoad', 'load');
+  var safeLoadAll         = renamed('safeLoadAll', 'loadAll');
+  var safeDump            = renamed('safeDump', 'dump');
+
+  var jsYaml = {
+  	Type: Type,
+  	Schema: Schema,
+  	FAILSAFE_SCHEMA: FAILSAFE_SCHEMA,
+  	JSON_SCHEMA: JSON_SCHEMA,
+  	CORE_SCHEMA: CORE_SCHEMA,
+  	DEFAULT_SCHEMA: DEFAULT_SCHEMA,
+  	load: load,
+  	loadAll: loadAll,
+  	dump: dump,
+  	YAMLException: YAMLException,
+  	types: types,
+  	safeLoad: safeLoad,
+  	safeLoadAll: safeLoadAll,
+  	safeDump: safeDump
+  };
+
+  exports.CORE_SCHEMA = CORE_SCHEMA;
+  exports.DEFAULT_SCHEMA = DEFAULT_SCHEMA;
+  exports.FAILSAFE_SCHEMA = FAILSAFE_SCHEMA;
+  exports.JSON_SCHEMA = JSON_SCHEMA;
+  exports.Schema = Schema;
+  exports.Type = Type;
+  exports.YAMLException = YAMLException;
+  exports.default = jsYaml;
+  exports.dump = dump;
+  exports.load = load;
+  exports.loadAll = loadAll;
+  exports.safeDump = safeDump;
+  exports.safeLoad = safeLoad;
+  exports.safeLoadAll = safeLoadAll;
+  exports.types = types;
+
+  Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
diff --git a/node_modules/js-yaml/dist/js-yaml.min.js b/node_modules/js-yaml/dist/js-yaml.min.js
new file mode 100644
index 0000000..bdd8eef
--- /dev/null
+++ b/node_modules/js-yaml/dist/js-yaml.min.js
@@ -0,0 +1,2 @@
+/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).jsyaml={})}(this,(function(e){"use strict";function t(e){return null==e}var n={isNothing:t,isObject:function(e){return"object"==typeof e&&null!==e},toArray:function(e){return Array.isArray(e)?e:t(e)?[]:[e]},repeat:function(e,t){var n,i="";for(n=0;n<t;n+=1)i+=e;return i},isNegativeZero:function(e){return 0===e&&Number.NEGATIVE_INFINITY===1/e},extend:function(e,t){var n,i,r,o;if(t)for(n=0,i=(o=Object.keys(t)).length;n<i;n+=1)e[r=o[n]]=t[r];return e}};function i(e,t){var n="",i=e.reason||"(unknown reason)";return e.mark?(e.mark.name&&(n+='in "'+e.mark.name+'" '),n+="("+(e.mark.line+1)+":"+(e.mark.column+1)+")",!t&&e.mark.snippet&&(n+="\n\n"+e.mark.snippet),i+" "+n):i}function r(e,t){Error.call(this),this.name="YAMLException",this.reason=e,this.mark=t,this.message=i(this,!1),Error.captureStackTrace?Error.captureStackTrace(this,this.constructor):this.stack=(new Error).stack||""}r.prototype=Object.create(Error.prototype),r.prototype.constructor=r,r.prototype.toString=function(e){return this.name+": "+i(this,e)};var o=r;function a(e,t,n,i,r){var o="",a="",l=Math.floor(r/2)-1;return i-t>l&&(t=i-l+(o=" ... 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more")}}},Ie=Object.prototype.toString,Se=Object.prototype.hasOwnProperty,Oe=65279,je={0:"\\0",7:"\\a",8:"\\b",9:"\\t",10:"\\n",11:"\\v",12:"\\f",13:"\\r",27:"\\e",34:'\\"',92:"\\\\",133:"\\N",160:"\\_",8232:"\\L",8233:"\\P"},Te=["y","Y","yes","Yes","YES","on","On","ON","n","N","no","No","NO","off","Off","OFF"],Ne=/^[-+]?[0-9_]+(?::[0-9_]+)+(?:\.[0-9_]*)?$/;function Fe(e){var t,i,r;if(t=e.toString(16).toUpperCase(),e<=255)i="x",r=2;else if(e<=65535)i="u",r=4;else{if(!(e<=4294967295))throw new o("code point within a string may not be greater than 0xFFFFFFFF");i="U",r=8}return"\\"+i+n.repeat("0",r-t.length)+t}function Ee(e){this.schema=e.schema||K,this.indent=Math.max(1,e.indent||2),this.noArrayIndent=e.noArrayIndent||!1,this.skipInvalid=e.skipInvalid||!1,this.flowLevel=n.isNothing(e.flowLevel)?-1:e.flowLevel,this.styleMap=function(e,t){var n,i,r,o,a,l,c;if(null===t)return{};for(n={},r=0,o=(i=Object.keys(t)).length;r<o;r+=1)a=i[r],l=String(t[a]),"!!"===a.slice(0,2)&&(a="tag:yaml.org,2002:"+a.slice(2)),(c=e.compiledTypeMap.fallback[a])&&Se.call(c.styleAliases,l)&&(l=c.styleAliases[l]),n[a]=l;return n}(this.schema,e.styles||null),this.sortKeys=e.sortKeys||!1,this.lineWidth=e.lineWidth||80,this.noRefs=e.noRefs||!1,this.noCompatMode=e.noCompatMode||!1,this.condenseFlow=e.condenseFlow||!1,this.quotingType='"'===e.quotingType?2:1,this.forceQuotes=e.forceQuotes||!1,this.replacer="function"==typeof e.replacer?e.replacer:null,this.implicitTypes=this.schema.compiledImplicit,this.explicitTypes=this.schema.compiledExplicit,this.tag=null,this.result="",this.duplicates=[],this.usedDuplicates=null}function Me(e,t){for(var i,r=n.repeat(" ",t),o=0,a=-1,l="",c=e.length;o<c;)-1===(a=e.indexOf("\n",o))?(i=e.slice(o),o=c):(i=e.slice(o,a+1),o=a+1),i.length&&"\n"!==i&&(l+=r),l+=i;return l}function Le(e,t){return"\n"+n.repeat(" ",e.indent*t)}function _e(e){return 32===e||9===e}function De(e){return 32<=e&&e<=126||161<=e&&e<=55295&&8232!==e&&8233!==e||57344<=e&&e<=65533&&e!==Oe||65536<=e&&e<=1114111}function Ue(e){return De(e)&&e!==Oe&&13!==e&&10!==e}function qe(e,t,n){var i=Ue(e),r=i&&!_e(e);return(n?i:i&&44!==e&&91!==e&&93!==e&&123!==e&&125!==e)&&35!==e&&!(58===t&&!r)||Ue(t)&&!_e(t)&&35===e||58===t&&r}function Ye(e,t){var n,i=e.charCodeAt(t);return i>=55296&&i<=56319&&t+1<e.length&&(n=e.charCodeAt(t+1))>=56320&&n<=57343?1024*(i-55296)+n-56320+65536:i}function Re(e){return/^\n* /.test(e)}function Be(e,t,n,i,r,o,a,l){var c,s,u=0,p=null,f=!1,d=!1,h=-1!==i,g=-1,m=De(s=Ye(e,0))&&s!==Oe&&!_e(s)&&45!==s&&63!==s&&58!==s&&44!==s&&91!==s&&93!==s&&123!==s&&125!==s&&35!==s&&38!==s&&42!==s&&33!==s&&124!==s&&61!==s&&62!==s&&39!==s&&34!==s&&37!==s&&64!==s&&96!==s&&function(e){return!_e(e)&&58!==e}(Ye(e,e.length-1));if(t||a)for(c=0;c<e.length;u>=65536?c+=2:c++){if(!De(u=Ye(e,c)))return 5;m=m&&qe(u,p,l),p=u}else{for(c=0;c<e.length;u>=65536?c+=2:c++){if(10===(u=Ye(e,c)))f=!0,h&&(d=d||c-g-1>i&&" "!==e[g+1],g=c);else if(!De(u))return 5;m=m&&qe(u,p,l),p=u}d=d||h&&c-g-1>i&&" "!==e[g+1]}return f||d?n>9&&Re(e)?5:a?2===o?5:2:d?4:3:!m||a||r(e)?2===o?5:2:1}function Ke(e,t,n,i,r){e.dump=function(){if(0===t.length)return 2===e.quotingType?'""':"''";if(!e.noCompatMode&&(-1!==Te.indexOf(t)||Ne.test(t)))return 2===e.quotingType?'"'+t+'"':"'"+t+"'";var a=e.indent*Math.max(1,n),l=-1===e.lineWidth?-1:Math.max(Math.min(e.lineWidth,40),e.lineWidth-a),c=i||e.flowLevel>-1&&n>=e.flowLevel;switch(Be(t,c,e.indent,l,(function(t){return function(e,t){var n,i;for(n=0,i=e.implicitTypes.length;n<i;n+=1)if(e.implicitTypes[n].resolve(t))return!0;return!1}(e,t)}),e.quotingType,e.forceQuotes&&!i,r)){case 1:return t;case 2:return"'"+t.replace(/'/g,"''")+"'";case 3:return"|"+Pe(t,e.indent)+We(Me(t,a));case 4:return">"+Pe(t,e.indent)+We(Me(function(e,t){var n,i,r=/(\n+)([^\n]*)/g,o=(l=e.indexOf("\n"),l=-1!==l?l:e.length,r.lastIndex=l,He(e.slice(0,l),t)),a="\n"===e[0]||" "===e[0];var l;for(;i=r.exec(e);){var c=i[1],s=i[2];n=" "===s[0],o+=c+(a||n||""===s?"":"\n")+He(s,t),a=n}return o}(t,l),a));case 5:return'"'+function(e){for(var t,n="",i=0,r=0;r<e.length;i>=65536?r+=2:r++)i=Ye(e,r),!(t=je[i])&&De(i)?(n+=e[r],i>=65536&&(n+=e[r+1])):n+=t||Fe(i);return n}(t)+'"';default:throw new o("impossible error: invalid scalar style")}}()}function Pe(e,t){var n=Re(e)?String(t):"",i="\n"===e[e.length-1];return n+(i&&("\n"===e[e.length-2]||"\n"===e)?"+":i?"":"-")+"\n"}function We(e){return"\n"===e[e.length-1]?e.slice(0,-1):e}function He(e,t){if(""===e||" "===e[0])return e;for(var n,i,r=/ [^ ]/g,o=0,a=0,l=0,c="";n=r.exec(e);)(l=n.index)-o>t&&(i=a>o?a:l,c+="\n"+e.slice(o,i),o=i+1),a=l;return c+="\n",e.length-o>t&&a>o?c+=e.slice(o,a)+"\n"+e.slice(a+1):c+=e.slice(o),c.slice(1)}function $e(e,t,n,i){var r,o,a,l="",c=e.tag;for(r=0,o=n.length;r<o;r+=1)a=n[r],e.replacer&&(a=e.replacer.call(n,String(r),a)),(Ve(e,t+1,a,!0,!0,!1,!0)||void 0===a&&Ve(e,t+1,null,!0,!0,!1,!0))&&(i&&""===l||(l+=Le(e,t)),e.dump&&10===e.dump.charCodeAt(0)?l+="-":l+="- ",l+=e.dump);e.tag=c,e.dump=l||"[]"}function Ge(e,t,n){var i,r,a,l,c,s;for(a=0,l=(r=n?e.explicitTypes:e.implicitTypes).length;a<l;a+=1)if(((c=r[a]).instanceOf||c.predicate)&&(!c.instanceOf||"object"==typeof t&&t instanceof c.instanceOf)&&(!c.predicate||c.predicate(t))){if(n?c.multi&&c.representName?e.tag=c.representName(t):e.tag=c.tag:e.tag="?",c.represent){if(s=e.styleMap[c.tag]||c.defaultStyle,"[object Function]"===Ie.call(c.represent))i=c.represent(t,s);else{if(!Se.call(c.represent,s))throw new o("!<"+c.tag+'> tag resolver accepts not "'+s+'" style');i=c.represent[s](t,s)}e.dump=i}return!0}return!1}function Ve(e,t,n,i,r,a,l){e.tag=null,e.dump=n,Ge(e,n,!1)||Ge(e,n,!0);var c,s=Ie.call(e.dump),u=i;i&&(i=e.flowLevel<0||e.flowLevel>t);var p,f,d="[object Object]"===s||"[object Array]"===s;if(d&&(f=-1!==(p=e.duplicates.indexOf(n))),(null!==e.tag&&"?"!==e.tag||f||2!==e.indent&&t>0)&&(r=!1),f&&e.usedDuplicates[p])e.dump="*ref_"+p;else{if(d&&f&&!e.usedDuplicates[p]&&(e.usedDuplicates[p]=!0),"[object Object]"===s)i&&0!==Object.keys(e.dump).length?(!function(e,t,n,i){var r,a,l,c,s,u,p="",f=e.tag,d=Object.keys(n);if(!0===e.sortKeys)d.sort();else if("function"==typeof e.sortKeys)d.sort(e.sortKeys);else if(e.sortKeys)throw new o("sortKeys must be a boolean or a function");for(r=0,a=d.length;r<a;r+=1)u="",i&&""===p||(u+=Le(e,t)),c=n[l=d[r]],e.replacer&&(c=e.replacer.call(n,l,c)),Ve(e,t+1,l,!0,!0,!0)&&((s=null!==e.tag&&"?"!==e.tag||e.dump&&e.dump.length>1024)&&(e.dump&&10===e.dump.charCodeAt(0)?u+="?":u+="? 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Use yaml."+t+" instead, which is now safe by default.")}}var ze=p,Xe=h,et=b,tt=O,nt=j,it=K,rt=xe.load,ot=xe.loadAll,at={dump:function(e,t){var n=new Ee(t=t||{});n.noRefs||Ze(e,n);var i=e;return n.replacer&&(i=n.replacer.call({"":i},"",i)),Ve(n,0,i,!0,!0)?n.dump+"\n":""}}.dump,lt=o,ct={binary:L,float:S,map:y,null:A,pairs:Y,set:B,timestamp:F,bool:v,int:C,merge:E,omap:U,seq:m,str:g},st=Qe("safeLoad","load"),ut=Qe("safeLoadAll","loadAll"),pt=Qe("safeDump","dump"),ft={Type:ze,Schema:Xe,FAILSAFE_SCHEMA:et,JSON_SCHEMA:tt,CORE_SCHEMA:nt,DEFAULT_SCHEMA:it,load:rt,loadAll:ot,dump:at,YAMLException:lt,types:ct,safeLoad:st,safeLoadAll:ut,safeDump:pt};e.CORE_SCHEMA=nt,e.DEFAULT_SCHEMA=it,e.FAILSAFE_SCHEMA=et,e.JSON_SCHEMA=tt,e.Schema=Xe,e.Type=ze,e.YAMLException=lt,e.default=ft,e.dump=at,e.load=rt,e.loadAll=ot,e.safeDump=pt,e.safeLoad=st,e.safeLoadAll=ut,e.types=ct,Object.defineProperty(e,"__esModule",{value:!0})}));
diff --git a/node_modules/js-yaml/dist/js-yaml.mjs b/node_modules/js-yaml/dist/js-yaml.mjs
new file mode 100644
index 0000000..be71cad
--- /dev/null
+++ b/node_modules/js-yaml/dist/js-yaml.mjs
@@ -0,0 +1,3851 @@
+
+/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
+function isNothing(subject) {
+  return (typeof subject === 'undefined') || (subject === null);
+}
+
+
+function isObject(subject) {
+  return (typeof subject === 'object') && (subject !== null);
+}
+
+
+function toArray(sequence) {
+  if (Array.isArray(sequence)) return sequence;
+  else if (isNothing(sequence)) return [];
+
+  return [ sequence ];
+}
+
+
+function extend(target, source) {
+  var index, length, key, sourceKeys;
+
+  if (source) {
+    sourceKeys = Object.keys(source);
+
+    for (index = 0, length = sourceKeys.length; index < length; index += 1) {
+      key = sourceKeys[index];
+      target[key] = source[key];
+    }
+  }
+
+  return target;
+}
+
+
+function repeat(string, count) {
+  var result = '', cycle;
+
+  for (cycle = 0; cycle < count; cycle += 1) {
+    result += string;
+  }
+
+  return result;
+}
+
+
+function isNegativeZero(number) {
+  return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
+}
+
+
+var isNothing_1      = isNothing;
+var isObject_1       = isObject;
+var toArray_1        = toArray;
+var repeat_1         = repeat;
+var isNegativeZero_1 = isNegativeZero;
+var extend_1         = extend;
+
+var common = {
+	isNothing: isNothing_1,
+	isObject: isObject_1,
+	toArray: toArray_1,
+	repeat: repeat_1,
+	isNegativeZero: isNegativeZero_1,
+	extend: extend_1
+};
+
+// YAML error class. http://stackoverflow.com/questions/8458984
+
+
+function formatError(exception, compact) {
+  var where = '', message = exception.reason || '(unknown reason)';
+
+  if (!exception.mark) return message;
+
+  if (exception.mark.name) {
+    where += 'in "' + exception.mark.name + '" ';
+  }
+
+  where += '(' + (exception.mark.line + 1) + ':' + (exception.mark.column + 1) + ')';
+
+  if (!compact && exception.mark.snippet) {
+    where += '\n\n' + exception.mark.snippet;
+  }
+
+  return message + ' ' + where;
+}
+
+
+function YAMLException$1(reason, mark) {
+  // Super constructor
+  Error.call(this);
+
+  this.name = 'YAMLException';
+  this.reason = reason;
+  this.mark = mark;
+  this.message = formatError(this, false);
+
+  // Include stack trace in error object
+  if (Error.captureStackTrace) {
+    // Chrome and NodeJS
+    Error.captureStackTrace(this, this.constructor);
+  } else {
+    // FF, IE 10+ and Safari 6+. Fallback for others
+    this.stack = (new Error()).stack || '';
+  }
+}
+
+
+// Inherit from Error
+YAMLException$1.prototype = Object.create(Error.prototype);
+YAMLException$1.prototype.constructor = YAMLException$1;
+
+
+YAMLException$1.prototype.toString = function toString(compact) {
+  return this.name + ': ' + formatError(this, compact);
+};
+
+
+var exception = YAMLException$1;
+
+// get snippet for a single line, respecting maxLength
+function getLine(buffer, lineStart, lineEnd, position, maxLineLength) {
+  var head = '';
+  var tail = '';
+  var maxHalfLength = Math.floor(maxLineLength / 2) - 1;
+
+  if (position - lineStart > maxHalfLength) {
+    head = ' ... ';
+    lineStart = position - maxHalfLength + head.length;
+  }
+
+  if (lineEnd - position > maxHalfLength) {
+    tail = ' ...';
+    lineEnd = position + maxHalfLength - tail.length;
+  }
+
+  return {
+    str: head + buffer.slice(lineStart, lineEnd).replace(/\t/g, '→') + tail,
+    pos: position - lineStart + head.length // relative position
+  };
+}
+
+
+function padStart(string, max) {
+  return common.repeat(' ', max - string.length) + string;
+}
+
+
+function makeSnippet(mark, options) {
+  options = Object.create(options || null);
+
+  if (!mark.buffer) return null;
+
+  if (!options.maxLength) options.maxLength = 79;
+  if (typeof options.indent      !== 'number') options.indent      = 1;
+  if (typeof options.linesBefore !== 'number') options.linesBefore = 3;
+  if (typeof options.linesAfter  !== 'number') options.linesAfter  = 2;
+
+  var re = /\r?\n|\r|\0/g;
+  var lineStarts = [ 0 ];
+  var lineEnds = [];
+  var match;
+  var foundLineNo = -1;
+
+  while ((match = re.exec(mark.buffer))) {
+    lineEnds.push(match.index);
+    lineStarts.push(match.index + match[0].length);
+
+    if (mark.position <= match.index && foundLineNo < 0) {
+      foundLineNo = lineStarts.length - 2;
+    }
+  }
+
+  if (foundLineNo < 0) foundLineNo = lineStarts.length - 1;
+
+  var result = '', i, line;
+  var lineNoLength = Math.min(mark.line + options.linesAfter, lineEnds.length).toString().length;
+  var maxLineLength = options.maxLength - (options.indent + lineNoLength + 3);
+
+  for (i = 1; i <= options.linesBefore; i++) {
+    if (foundLineNo - i < 0) break;
+    line = getLine(
+      mark.buffer,
+      lineStarts[foundLineNo - i],
+      lineEnds[foundLineNo - i],
+      mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo - i]),
+      maxLineLength
+    );
+    result = common.repeat(' ', options.indent) + padStart((mark.line - i + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n' + result;
+  }
+
+  line = getLine(mark.buffer, lineStarts[foundLineNo], lineEnds[foundLineNo], mark.position, maxLineLength);
+  result += common.repeat(' ', options.indent) + padStart((mark.line + 1).toString(), lineNoLength) +
+    ' | ' + line.str + '\n';
+  result += common.repeat('-', options.indent + lineNoLength + 3 + line.pos) + '^' + '\n';
+
+  for (i = 1; i <= options.linesAfter; i++) {
+    if (foundLineNo + i >= lineEnds.length) break;
+    line = getLine(
+      mark.buffer,
+      lineStarts[foundLineNo + i],
+      lineEnds[foundLineNo + i],
+      mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo + i]),
+      maxLineLength
+    );
+    result += common.repeat(' ', options.indent) + padStart((mark.line + i + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n';
+  }
+
+  return result.replace(/\n$/, '');
+}
+
+
+var snippet = makeSnippet;
+
+var TYPE_CONSTRUCTOR_OPTIONS = [
+  'kind',
+  'multi',
+  'resolve',
+  'construct',
+  'instanceOf',
+  'predicate',
+  'represent',
+  'representName',
+  'defaultStyle',
+  'styleAliases'
+];
+
+var YAML_NODE_KINDS = [
+  'scalar',
+  'sequence',
+  'mapping'
+];
+
+function compileStyleAliases(map) {
+  var result = {};
+
+  if (map !== null) {
+    Object.keys(map).forEach(function (style) {
+      map[style].forEach(function (alias) {
+        result[String(alias)] = style;
+      });
+    });
+  }
+
+  return result;
+}
+
+function Type$1(tag, options) {
+  options = options || {};
+
+  Object.keys(options).forEach(function (name) {
+    if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
+      throw new exception('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
+    }
+  });
+
+  // TODO: Add tag format check.
+  this.options       = options; // keep original options in case user wants to extend this type later
+  this.tag           = tag;
+  this.kind          = options['kind']          || null;
+  this.resolve       = options['resolve']       || function () { return true; };
+  this.construct     = options['construct']     || function (data) { return data; };
+  this.instanceOf    = options['instanceOf']    || null;
+  this.predicate     = options['predicate']     || null;
+  this.represent     = options['represent']     || null;
+  this.representName = options['representName'] || null;
+  this.defaultStyle  = options['defaultStyle']  || null;
+  this.multi         = options['multi']         || false;
+  this.styleAliases  = compileStyleAliases(options['styleAliases'] || null);
+
+  if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
+    throw new exception('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
+  }
+}
+
+var type = Type$1;
+
+/*eslint-disable max-len*/
+
+
+
+
+
+function compileList(schema, name) {
+  var result = [];
+
+  schema[name].forEach(function (currentType) {
+    var newIndex = result.length;
+
+    result.forEach(function (previousType, previousIndex) {
+      if (previousType.tag === currentType.tag &&
+          previousType.kind === currentType.kind &&
+          previousType.multi === currentType.multi) {
+
+        newIndex = previousIndex;
+      }
+    });
+
+    result[newIndex] = currentType;
+  });
+
+  return result;
+}
+
+
+function compileMap(/* lists... */) {
+  var result = {
+        scalar: {},
+        sequence: {},
+        mapping: {},
+        fallback: {},
+        multi: {
+          scalar: [],
+          sequence: [],
+          mapping: [],
+          fallback: []
+        }
+      }, index, length;
+
+  function collectType(type) {
+    if (type.multi) {
+      result.multi[type.kind].push(type);
+      result.multi['fallback'].push(type);
+    } else {
+      result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+    }
+  }
+
+  for (index = 0, length = arguments.length; index < length; index += 1) {
+    arguments[index].forEach(collectType);
+  }
+  return result;
+}
+
+
+function Schema$1(definition) {
+  return this.extend(definition);
+}
+
+
+Schema$1.prototype.extend = function extend(definition) {
+  var implicit = [];
+  var explicit = [];
+
+  if (definition instanceof type) {
+    // Schema.extend(type)
+    explicit.push(definition);
+
+  } else if (Array.isArray(definition)) {
+    // Schema.extend([ type1, type2, ... ])
+    explicit = explicit.concat(definition);
+
+  } else if (definition && (Array.isArray(definition.implicit) || Array.isArray(definition.explicit))) {
+    // Schema.extend({ explicit: [ type1, type2, ... ], implicit: [ type1, type2, ... ] })
+    if (definition.implicit) implicit = implicit.concat(definition.implicit);
+    if (definition.explicit) explicit = explicit.concat(definition.explicit);
+
+  } else {
+    throw new exception('Schema.extend argument should be a Type, [ Type ], ' +
+      'or a schema definition ({ implicit: [...], explicit: [...] })');
+  }
+
+  implicit.forEach(function (type$1) {
+    if (!(type$1 instanceof type)) {
+      throw new exception('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+    }
+
+    if (type$1.loadKind && type$1.loadKind !== 'scalar') {
+      throw new exception('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
+    }
+
+    if (type$1.multi) {
+      throw new exception('There is a multi type in the implicit list of a schema. Multi tags can only be listed as explicit.');
+    }
+  });
+
+  explicit.forEach(function (type$1) {
+    if (!(type$1 instanceof type)) {
+      throw new exception('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+    }
+  });
+
+  var result = Object.create(Schema$1.prototype);
+
+  result.implicit = (this.implicit || []).concat(implicit);
+  result.explicit = (this.explicit || []).concat(explicit);
+
+  result.compiledImplicit = compileList(result, 'implicit');
+  result.compiledExplicit = compileList(result, 'explicit');
+  result.compiledTypeMap  = compileMap(result.compiledImplicit, result.compiledExplicit);
+
+  return result;
+};
+
+
+var schema = Schema$1;
+
+var str = new type('tag:yaml.org,2002:str', {
+  kind: 'scalar',
+  construct: function (data) { return data !== null ? data : ''; }
+});
+
+var seq = new type('tag:yaml.org,2002:seq', {
+  kind: 'sequence',
+  construct: function (data) { return data !== null ? data : []; }
+});
+
+var map = new type('tag:yaml.org,2002:map', {
+  kind: 'mapping',
+  construct: function (data) { return data !== null ? data : {}; }
+});
+
+var failsafe = new schema({
+  explicit: [
+    str,
+    seq,
+    map
+  ]
+});
+
+function resolveYamlNull(data) {
+  if (data === null) return true;
+
+  var max = data.length;
+
+  return (max === 1 && data === '~') ||
+         (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
+}
+
+function constructYamlNull() {
+  return null;
+}
+
+function isNull(object) {
+  return object === null;
+}
+
+var _null = new type('tag:yaml.org,2002:null', {
+  kind: 'scalar',
+  resolve: resolveYamlNull,
+  construct: constructYamlNull,
+  predicate: isNull,
+  represent: {
+    canonical: function () { return '~';    },
+    lowercase: function () { return 'null'; },
+    uppercase: function () { return 'NULL'; },
+    camelcase: function () { return 'Null'; },
+    empty:     function () { return '';     }
+  },
+  defaultStyle: 'lowercase'
+});
+
+function resolveYamlBoolean(data) {
+  if (data === null) return false;
+
+  var max = data.length;
+
+  return (max === 4 && (data === 'true' || data === 'True' || data === 'TRUE')) ||
+         (max === 5 && (data === 'false' || data === 'False' || data === 'FALSE'));
+}
+
+function constructYamlBoolean(data) {
+  return data === 'true' ||
+         data === 'True' ||
+         data === 'TRUE';
+}
+
+function isBoolean(object) {
+  return Object.prototype.toString.call(object) === '[object Boolean]';
+}
+
+var bool = new type('tag:yaml.org,2002:bool', {
+  kind: 'scalar',
+  resolve: resolveYamlBoolean,
+  construct: constructYamlBoolean,
+  predicate: isBoolean,
+  represent: {
+    lowercase: function (object) { return object ? 'true' : 'false'; },
+    uppercase: function (object) { return object ? 'TRUE' : 'FALSE'; },
+    camelcase: function (object) { return object ? 'True' : 'False'; }
+  },
+  defaultStyle: 'lowercase'
+});
+
+function isHexCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
+         ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
+         ((0x61/* a */ <= c) && (c <= 0x66/* f */));
+}
+
+function isOctCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
+}
+
+function isDecCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
+}
+
+function resolveYamlInteger(data) {
+  if (data === null) return false;
+
+  var max = data.length,
+      index = 0,
+      hasDigits = false,
+      ch;
+
+  if (!max) return false;
+
+  ch = data[index];
+
+  // sign
+  if (ch === '-' || ch === '+') {
+    ch = data[++index];
+  }
+
+  if (ch === '0') {
+    // 0
+    if (index + 1 === max) return true;
+    ch = data[++index];
+
+    // base 2, base 8, base 16
+
+    if (ch === 'b') {
+      // base 2
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (ch !== '0' && ch !== '1') return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
+    }
+
+
+    if (ch === 'x') {
+      // base 16
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isHexCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
+    }
+
+
+    if (ch === 'o') {
+      // base 8
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isOctCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
+    }
+  }
+
+  // base 10 (except 0)
+
+  // value should not start with `_`;
+  if (ch === '_') return false;
+
+  for (; index < max; index++) {
+    ch = data[index];
+    if (ch === '_') continue;
+    if (!isDecCode(data.charCodeAt(index))) {
+      return false;
+    }
+    hasDigits = true;
+  }
+
+  // Should have digits and should not end with `_`
+  if (!hasDigits || ch === '_') return false;
+
+  return true;
+}
+
+function constructYamlInteger(data) {
+  var value = data, sign = 1, ch;
+
+  if (value.indexOf('_') !== -1) {
+    value = value.replace(/_/g, '');
+  }
+
+  ch = value[0];
+
+  if (ch === '-' || ch === '+') {
+    if (ch === '-') sign = -1;
+    value = value.slice(1);
+    ch = value[0];
+  }
+
+  if (value === '0') return 0;
+
+  if (ch === '0') {
+    if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+    if (value[1] === 'x') return sign * parseInt(value.slice(2), 16);
+    if (value[1] === 'o') return sign * parseInt(value.slice(2), 8);
+  }
+
+  return sign * parseInt(value, 10);
+}
+
+function isInteger(object) {
+  return (Object.prototype.toString.call(object)) === '[object Number]' &&
+         (object % 1 === 0 && !common.isNegativeZero(object));
+}
+
+var int = new type('tag:yaml.org,2002:int', {
+  kind: 'scalar',
+  resolve: resolveYamlInteger,
+  construct: constructYamlInteger,
+  predicate: isInteger,
+  represent: {
+    binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
+    octal:       function (obj) { return obj >= 0 ? '0o'  + obj.toString(8) : '-0o'  + obj.toString(8).slice(1); },
+    decimal:     function (obj) { return obj.toString(10); },
+    /* eslint-disable max-len */
+    hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
+  },
+  defaultStyle: 'decimal',
+  styleAliases: {
+    binary:      [ 2,  'bin' ],
+    octal:       [ 8,  'oct' ],
+    decimal:     [ 10, 'dec' ],
+    hexadecimal: [ 16, 'hex' ]
+  }
+});
+
+var YAML_FLOAT_PATTERN = new RegExp(
+  // 2.5e4, 2.5 and integers
+  '^(?:[-+]?(?:[0-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
+  // .2e4, .2
+  // special case, seems not from spec
+  '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
+  // .inf
+  '|[-+]?\\.(?:inf|Inf|INF)' +
+  // .nan
+  '|\\.(?:nan|NaN|NAN))$');
+
+function resolveYamlFloat(data) {
+  if (data === null) return false;
+
+  if (!YAML_FLOAT_PATTERN.test(data) ||
+      // Quick hack to not allow integers end with `_`
+      // Probably should update regexp & check speed
+      data[data.length - 1] === '_') {
+    return false;
+  }
+
+  return true;
+}
+
+function constructYamlFloat(data) {
+  var value, sign;
+
+  value  = data.replace(/_/g, '').toLowerCase();
+  sign   = value[0] === '-' ? -1 : 1;
+
+  if ('+-'.indexOf(value[0]) >= 0) {
+    value = value.slice(1);
+  }
+
+  if (value === '.inf') {
+    return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
+
+  } else if (value === '.nan') {
+    return NaN;
+  }
+  return sign * parseFloat(value, 10);
+}
+
+
+var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
+
+function representYamlFloat(object, style) {
+  var res;
+
+  if (isNaN(object)) {
+    switch (style) {
+      case 'lowercase': return '.nan';
+      case 'uppercase': return '.NAN';
+      case 'camelcase': return '.NaN';
+    }
+  } else if (Number.POSITIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '.inf';
+      case 'uppercase': return '.INF';
+      case 'camelcase': return '.Inf';
+    }
+  } else if (Number.NEGATIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '-.inf';
+      case 'uppercase': return '-.INF';
+      case 'camelcase': return '-.Inf';
+    }
+  } else if (common.isNegativeZero(object)) {
+    return '-0.0';
+  }
+
+  res = object.toString(10);
+
+  // JS stringifier can build scientific format without dots: 5e-100,
+  // while YAML requres dot: 5.e-100. Fix it with simple hack
+
+  return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
+}
+
+function isFloat(object) {
+  return (Object.prototype.toString.call(object) === '[object Number]') &&
+         (object % 1 !== 0 || common.isNegativeZero(object));
+}
+
+var float = new type('tag:yaml.org,2002:float', {
+  kind: 'scalar',
+  resolve: resolveYamlFloat,
+  construct: constructYamlFloat,
+  predicate: isFloat,
+  represent: representYamlFloat,
+  defaultStyle: 'lowercase'
+});
+
+var json = failsafe.extend({
+  implicit: [
+    _null,
+    bool,
+    int,
+    float
+  ]
+});
+
+var core = json;
+
+var YAML_DATE_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9])'                    + // [2] month
+  '-([0-9][0-9])$');                   // [3] day
+
+var YAML_TIMESTAMP_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9]?)'                   + // [2] month
+  '-([0-9][0-9]?)'                   + // [3] day
+  '(?:[Tt]|[ \\t]+)'                 + // ...
+  '([0-9][0-9]?)'                    + // [4] hour
+  ':([0-9][0-9])'                    + // [5] minute
+  ':([0-9][0-9])'                    + // [6] second
+  '(?:\\.([0-9]*))?'                 + // [7] fraction
+  '(?:[ \\t]*(Z|([-+])([0-9][0-9]?)' + // [8] tz [9] tz_sign [10] tz_hour
+  '(?::([0-9][0-9]))?))?$');           // [11] tz_minute
+
+function resolveYamlTimestamp(data) {
+  if (data === null) return false;
+  if (YAML_DATE_REGEXP.exec(data) !== null) return true;
+  if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
+  return false;
+}
+
+function constructYamlTimestamp(data) {
+  var match, year, month, day, hour, minute, second, fraction = 0,
+      delta = null, tz_hour, tz_minute, date;
+
+  match = YAML_DATE_REGEXP.exec(data);
+  if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
+
+  if (match === null) throw new Error('Date resolve error');
+
+  // match: [1] year [2] month [3] day
+
+  year = +(match[1]);
+  month = +(match[2]) - 1; // JS month starts with 0
+  day = +(match[3]);
+
+  if (!match[4]) { // no hour
+    return new Date(Date.UTC(year, month, day));
+  }
+
+  // match: [4] hour [5] minute [6] second [7] fraction
+
+  hour = +(match[4]);
+  minute = +(match[5]);
+  second = +(match[6]);
+
+  if (match[7]) {
+    fraction = match[7].slice(0, 3);
+    while (fraction.length < 3) { // milli-seconds
+      fraction += '0';
+    }
+    fraction = +fraction;
+  }
+
+  // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
+
+  if (match[9]) {
+    tz_hour = +(match[10]);
+    tz_minute = +(match[11] || 0);
+    delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
+    if (match[9] === '-') delta = -delta;
+  }
+
+  date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
+
+  if (delta) date.setTime(date.getTime() - delta);
+
+  return date;
+}
+
+function representYamlTimestamp(object /*, style*/) {
+  return object.toISOString();
+}
+
+var timestamp = new type('tag:yaml.org,2002:timestamp', {
+  kind: 'scalar',
+  resolve: resolveYamlTimestamp,
+  construct: constructYamlTimestamp,
+  instanceOf: Date,
+  represent: representYamlTimestamp
+});
+
+function resolveYamlMerge(data) {
+  return data === '<<' || data === null;
+}
+
+var merge = new type('tag:yaml.org,2002:merge', {
+  kind: 'scalar',
+  resolve: resolveYamlMerge
+});
+
+/*eslint-disable no-bitwise*/
+
+
+
+
+
+// [ 64, 65, 66 ] -> [ padding, CR, LF ]
+var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
+
+
+function resolveYamlBinary(data) {
+  if (data === null) return false;
+
+  var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
+
+  // Convert one by one.
+  for (idx = 0; idx < max; idx++) {
+    code = map.indexOf(data.charAt(idx));
+
+    // Skip CR/LF
+    if (code > 64) continue;
+
+    // Fail on illegal characters
+    if (code < 0) return false;
+
+    bitlen += 6;
+  }
+
+  // If there are any bits left, source was corrupted
+  return (bitlen % 8) === 0;
+}
+
+function constructYamlBinary(data) {
+  var idx, tailbits,
+      input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
+      max = input.length,
+      map = BASE64_MAP,
+      bits = 0,
+      result = [];
+
+  // Collect by 6*4 bits (3 bytes)
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 4 === 0) && idx) {
+      result.push((bits >> 16) & 0xFF);
+      result.push((bits >> 8) & 0xFF);
+      result.push(bits & 0xFF);
+    }
+
+    bits = (bits << 6) | map.indexOf(input.charAt(idx));
+  }
+
+  // Dump tail
+
+  tailbits = (max % 4) * 6;
+
+  if (tailbits === 0) {
+    result.push((bits >> 16) & 0xFF);
+    result.push((bits >> 8) & 0xFF);
+    result.push(bits & 0xFF);
+  } else if (tailbits === 18) {
+    result.push((bits >> 10) & 0xFF);
+    result.push((bits >> 2) & 0xFF);
+  } else if (tailbits === 12) {
+    result.push((bits >> 4) & 0xFF);
+  }
+
+  return new Uint8Array(result);
+}
+
+function representYamlBinary(object /*, style*/) {
+  var result = '', bits = 0, idx, tail,
+      max = object.length,
+      map = BASE64_MAP;
+
+  // Convert every three bytes to 4 ASCII characters.
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 3 === 0) && idx) {
+      result += map[(bits >> 18) & 0x3F];
+      result += map[(bits >> 12) & 0x3F];
+      result += map[(bits >> 6) & 0x3F];
+      result += map[bits & 0x3F];
+    }
+
+    bits = (bits << 8) + object[idx];
+  }
+
+  // Dump tail
+
+  tail = max % 3;
+
+  if (tail === 0) {
+    result += map[(bits >> 18) & 0x3F];
+    result += map[(bits >> 12) & 0x3F];
+    result += map[(bits >> 6) & 0x3F];
+    result += map[bits & 0x3F];
+  } else if (tail === 2) {
+    result += map[(bits >> 10) & 0x3F];
+    result += map[(bits >> 4) & 0x3F];
+    result += map[(bits << 2) & 0x3F];
+    result += map[64];
+  } else if (tail === 1) {
+    result += map[(bits >> 2) & 0x3F];
+    result += map[(bits << 4) & 0x3F];
+    result += map[64];
+    result += map[64];
+  }
+
+  return result;
+}
+
+function isBinary(obj) {
+  return Object.prototype.toString.call(obj) ===  '[object Uint8Array]';
+}
+
+var binary = new type('tag:yaml.org,2002:binary', {
+  kind: 'scalar',
+  resolve: resolveYamlBinary,
+  construct: constructYamlBinary,
+  predicate: isBinary,
+  represent: representYamlBinary
+});
+
+var _hasOwnProperty$3 = Object.prototype.hasOwnProperty;
+var _toString$2       = Object.prototype.toString;
+
+function resolveYamlOmap(data) {
+  if (data === null) return true;
+
+  var objectKeys = [], index, length, pair, pairKey, pairHasKey,
+      object = data;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+    pairHasKey = false;
+
+    if (_toString$2.call(pair) !== '[object Object]') return false;
+
+    for (pairKey in pair) {
+      if (_hasOwnProperty$3.call(pair, pairKey)) {
+        if (!pairHasKey) pairHasKey = true;
+        else return false;
+      }
+    }
+
+    if (!pairHasKey) return false;
+
+    if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
+    else return false;
+  }
+
+  return true;
+}
+
+function constructYamlOmap(data) {
+  return data !== null ? data : [];
+}
+
+var omap = new type('tag:yaml.org,2002:omap', {
+  kind: 'sequence',
+  resolve: resolveYamlOmap,
+  construct: constructYamlOmap
+});
+
+var _toString$1 = Object.prototype.toString;
+
+function resolveYamlPairs(data) {
+  if (data === null) return true;
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    if (_toString$1.call(pair) !== '[object Object]') return false;
+
+    keys = Object.keys(pair);
+
+    if (keys.length !== 1) return false;
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return true;
+}
+
+function constructYamlPairs(data) {
+  if (data === null) return [];
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    keys = Object.keys(pair);
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return result;
+}
+
+var pairs = new type('tag:yaml.org,2002:pairs', {
+  kind: 'sequence',
+  resolve: resolveYamlPairs,
+  construct: constructYamlPairs
+});
+
+var _hasOwnProperty$2 = Object.prototype.hasOwnProperty;
+
+function resolveYamlSet(data) {
+  if (data === null) return true;
+
+  var key, object = data;
+
+  for (key in object) {
+    if (_hasOwnProperty$2.call(object, key)) {
+      if (object[key] !== null) return false;
+    }
+  }
+
+  return true;
+}
+
+function constructYamlSet(data) {
+  return data !== null ? data : {};
+}
+
+var set = new type('tag:yaml.org,2002:set', {
+  kind: 'mapping',
+  resolve: resolveYamlSet,
+  construct: constructYamlSet
+});
+
+var _default = core.extend({
+  implicit: [
+    timestamp,
+    merge
+  ],
+  explicit: [
+    binary,
+    omap,
+    pairs,
+    set
+  ]
+});
+
+/*eslint-disable max-len,no-use-before-define*/
+
+
+
+
+
+
+
+var _hasOwnProperty$1 = Object.prototype.hasOwnProperty;
+
+
+var CONTEXT_FLOW_IN   = 1;
+var CONTEXT_FLOW_OUT  = 2;
+var CONTEXT_BLOCK_IN  = 3;
+var CONTEXT_BLOCK_OUT = 4;
+
+
+var CHOMPING_CLIP  = 1;
+var CHOMPING_STRIP = 2;
+var CHOMPING_KEEP  = 3;
+
+
+var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
+var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
+var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
+var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
+var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
+
+
+function _class(obj) { return Object.prototype.toString.call(obj); }
+
+function is_EOL(c) {
+  return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
+}
+
+function is_WHITE_SPACE(c) {
+  return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
+}
+
+function is_WS_OR_EOL(c) {
+  return (c === 0x09/* Tab */) ||
+         (c === 0x20/* Space */) ||
+         (c === 0x0A/* LF */) ||
+         (c === 0x0D/* CR */);
+}
+
+function is_FLOW_INDICATOR(c) {
+  return c === 0x2C/* , */ ||
+         c === 0x5B/* [ */ ||
+         c === 0x5D/* ] */ ||
+         c === 0x7B/* { */ ||
+         c === 0x7D/* } */;
+}
+
+function fromHexCode(c) {
+  var lc;
+
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  /*eslint-disable no-bitwise*/
+  lc = c | 0x20;
+
+  if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
+    return lc - 0x61 + 10;
+  }
+
+  return -1;
+}
+
+function escapedHexLen(c) {
+  if (c === 0x78/* x */) { return 2; }
+  if (c === 0x75/* u */) { return 4; }
+  if (c === 0x55/* U */) { return 8; }
+  return 0;
+}
+
+function fromDecimalCode(c) {
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  return -1;
+}
+
+function simpleEscapeSequence(c) {
+  /* eslint-disable indent */
+  return (c === 0x30/* 0 */) ? '\x00' :
+        (c === 0x61/* a */) ? '\x07' :
+        (c === 0x62/* b */) ? '\x08' :
+        (c === 0x74/* t */) ? '\x09' :
+        (c === 0x09/* Tab */) ? '\x09' :
+        (c === 0x6E/* n */) ? '\x0A' :
+        (c === 0x76/* v */) ? '\x0B' :
+        (c === 0x66/* f */) ? '\x0C' :
+        (c === 0x72/* r */) ? '\x0D' :
+        (c === 0x65/* e */) ? '\x1B' :
+        (c === 0x20/* Space */) ? ' ' :
+        (c === 0x22/* " */) ? '\x22' :
+        (c === 0x2F/* / */) ? '/' :
+        (c === 0x5C/* \ */) ? '\x5C' :
+        (c === 0x4E/* N */) ? '\x85' :
+        (c === 0x5F/* _ */) ? '\xA0' :
+        (c === 0x4C/* L */) ? '\u2028' :
+        (c === 0x50/* P */) ? '\u2029' : '';
+}
+
+function charFromCodepoint(c) {
+  if (c <= 0xFFFF) {
+    return String.fromCharCode(c);
+  }
+  // Encode UTF-16 surrogate pair
+  // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
+  return String.fromCharCode(
+    ((c - 0x010000) >> 10) + 0xD800,
+    ((c - 0x010000) & 0x03FF) + 0xDC00
+  );
+}
+
+var simpleEscapeCheck = new Array(256); // integer, for fast access
+var simpleEscapeMap = new Array(256);
+for (var i = 0; i < 256; i++) {
+  simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
+  simpleEscapeMap[i] = simpleEscapeSequence(i);
+}
+
+
+function State$1(input, options) {
+  this.input = input;
+
+  this.filename  = options['filename']  || null;
+  this.schema    = options['schema']    || _default;
+  this.onWarning = options['onWarning'] || null;
+  // (Hidden) Remove? makes the loader to expect YAML 1.1 documents
+  // if such documents have no explicit %YAML directive
+  this.legacy    = options['legacy']    || false;
+
+  this.json      = options['json']      || false;
+  this.listener  = options['listener']  || null;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.typeMap       = this.schema.compiledTypeMap;
+
+  this.length     = input.length;
+  this.position   = 0;
+  this.line       = 0;
+  this.lineStart  = 0;
+  this.lineIndent = 0;
+
+  // position of first leading tab in the current line,
+  // used to make sure there are no tabs in the indentation
+  this.firstTabInLine = -1;
+
+  this.documents = [];
+
+  /*
+  this.version;
+  this.checkLineBreaks;
+  this.tagMap;
+  this.anchorMap;
+  this.tag;
+  this.anchor;
+  this.kind;
+  this.result;*/
+
+}
+
+
+function generateError(state, message) {
+  var mark = {
+    name:     state.filename,
+    buffer:   state.input.slice(0, -1), // omit trailing \0
+    position: state.position,
+    line:     state.line,
+    column:   state.position - state.lineStart
+  };
+
+  mark.snippet = snippet(mark);
+
+  return new exception(message, mark);
+}
+
+function throwError(state, message) {
+  throw generateError(state, message);
+}
+
+function throwWarning(state, message) {
+  if (state.onWarning) {
+    state.onWarning.call(null, generateError(state, message));
+  }
+}
+
+
+var directiveHandlers = {
+
+  YAML: function handleYamlDirective(state, name, args) {
+
+    var match, major, minor;
+
+    if (state.version !== null) {
+      throwError(state, 'duplication of %YAML directive');
+    }
+
+    if (args.length !== 1) {
+      throwError(state, 'YAML directive accepts exactly one argument');
+    }
+
+    match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
+
+    if (match === null) {
+      throwError(state, 'ill-formed argument of the YAML directive');
+    }
+
+    major = parseInt(match[1], 10);
+    minor = parseInt(match[2], 10);
+
+    if (major !== 1) {
+      throwError(state, 'unacceptable YAML version of the document');
+    }
+
+    state.version = args[0];
+    state.checkLineBreaks = (minor < 2);
+
+    if (minor !== 1 && minor !== 2) {
+      throwWarning(state, 'unsupported YAML version of the document');
+    }
+  },
+
+  TAG: function handleTagDirective(state, name, args) {
+
+    var handle, prefix;
+
+    if (args.length !== 2) {
+      throwError(state, 'TAG directive accepts exactly two arguments');
+    }
+
+    handle = args[0];
+    prefix = args[1];
+
+    if (!PATTERN_TAG_HANDLE.test(handle)) {
+      throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
+    }
+
+    if (_hasOwnProperty$1.call(state.tagMap, handle)) {
+      throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
+    }
+
+    if (!PATTERN_TAG_URI.test(prefix)) {
+      throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
+    }
+
+    try {
+      prefix = decodeURIComponent(prefix);
+    } catch (err) {
+      throwError(state, 'tag prefix is malformed: ' + prefix);
+    }
+
+    state.tagMap[handle] = prefix;
+  }
+};
+
+
+function captureSegment(state, start, end, checkJson) {
+  var _position, _length, _character, _result;
+
+  if (start < end) {
+    _result = state.input.slice(start, end);
+
+    if (checkJson) {
+      for (_position = 0, _length = _result.length; _position < _length; _position += 1) {
+        _character = _result.charCodeAt(_position);
+        if (!(_character === 0x09 ||
+              (0x20 <= _character && _character <= 0x10FFFF))) {
+          throwError(state, 'expected valid JSON character');
+        }
+      }
+    } else if (PATTERN_NON_PRINTABLE.test(_result)) {
+      throwError(state, 'the stream contains non-printable characters');
+    }
+
+    state.result += _result;
+  }
+}
+
+function mergeMappings(state, destination, source, overridableKeys) {
+  var sourceKeys, key, index, quantity;
+
+  if (!common.isObject(source)) {
+    throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
+  }
+
+  sourceKeys = Object.keys(source);
+
+  for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
+    key = sourceKeys[index];
+
+    if (!_hasOwnProperty$1.call(destination, key)) {
+      destination[key] = source[key];
+      overridableKeys[key] = true;
+    }
+  }
+}
+
+function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode,
+  startLine, startLineStart, startPos) {
+
+  var index, quantity;
+
+  // The output is a plain object here, so keys can only be strings.
+  // We need to convert keyNode to a string, but doing so can hang the process
+  // (deeply nested arrays that explode exponentially using aliases).
+  if (Array.isArray(keyNode)) {
+    keyNode = Array.prototype.slice.call(keyNode);
+
+    for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
+      if (Array.isArray(keyNode[index])) {
+        throwError(state, 'nested arrays are not supported inside keys');
+      }
+
+      if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
+        keyNode[index] = '[object Object]';
+      }
+    }
+  }
+
+  // Avoid code execution in load() via toString property
+  // (still use its own toString for arrays, timestamps,
+  // and whatever user schema extensions happen to have @@toStringTag)
+  if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
+    keyNode = '[object Object]';
+  }
+
+
+  keyNode = String(keyNode);
+
+  if (_result === null) {
+    _result = {};
+  }
+
+  if (keyTag === 'tag:yaml.org,2002:merge') {
+    if (Array.isArray(valueNode)) {
+      for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
+        mergeMappings(state, _result, valueNode[index], overridableKeys);
+      }
+    } else {
+      mergeMappings(state, _result, valueNode, overridableKeys);
+    }
+  } else {
+    if (!state.json &&
+        !_hasOwnProperty$1.call(overridableKeys, keyNode) &&
+        _hasOwnProperty$1.call(_result, keyNode)) {
+      state.line = startLine || state.line;
+      state.lineStart = startLineStart || state.lineStart;
+      state.position = startPos || state.position;
+      throwError(state, 'duplicated mapping key');
+    }
+
+    // used for this specific key only because Object.defineProperty is slow
+    if (keyNode === '__proto__') {
+      Object.defineProperty(_result, keyNode, {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value: valueNode
+      });
+    } else {
+      _result[keyNode] = valueNode;
+    }
+    delete overridableKeys[keyNode];
+  }
+
+  return _result;
+}
+
+function readLineBreak(state) {
+  var ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x0A/* LF */) {
+    state.position++;
+  } else if (ch === 0x0D/* CR */) {
+    state.position++;
+    if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
+      state.position++;
+    }
+  } else {
+    throwError(state, 'a line break is expected');
+  }
+
+  state.line += 1;
+  state.lineStart = state.position;
+  state.firstTabInLine = -1;
+}
+
+function skipSeparationSpace(state, allowComments, checkIndent) {
+  var lineBreaks = 0,
+      ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    while (is_WHITE_SPACE(ch)) {
+      if (ch === 0x09/* Tab */ && state.firstTabInLine === -1) {
+        state.firstTabInLine = state.position;
+      }
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (allowComments && ch === 0x23/* # */) {
+      do {
+        ch = state.input.charCodeAt(++state.position);
+      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
+    }
+
+    if (is_EOL(ch)) {
+      readLineBreak(state);
+
+      ch = state.input.charCodeAt(state.position);
+      lineBreaks++;
+      state.lineIndent = 0;
+
+      while (ch === 0x20/* Space */) {
+        state.lineIndent++;
+        ch = state.input.charCodeAt(++state.position);
+      }
+    } else {
+      break;
+    }
+  }
+
+  if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
+    throwWarning(state, 'deficient indentation');
+  }
+
+  return lineBreaks;
+}
+
+function testDocumentSeparator(state) {
+  var _position = state.position,
+      ch;
+
+  ch = state.input.charCodeAt(_position);
+
+  // Condition state.position === state.lineStart is tested
+  // in parent on each call, for efficiency. No needs to test here again.
+  if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
+      ch === state.input.charCodeAt(_position + 1) &&
+      ch === state.input.charCodeAt(_position + 2)) {
+
+    _position += 3;
+
+    ch = state.input.charCodeAt(_position);
+
+    if (ch === 0 || is_WS_OR_EOL(ch)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function writeFoldedLines(state, count) {
+  if (count === 1) {
+    state.result += ' ';
+  } else if (count > 1) {
+    state.result += common.repeat('\n', count - 1);
+  }
+}
+
+
+function readPlainScalar(state, nodeIndent, withinFlowCollection) {
+  var preceding,
+      following,
+      captureStart,
+      captureEnd,
+      hasPendingContent,
+      _line,
+      _lineStart,
+      _lineIndent,
+      _kind = state.kind,
+      _result = state.result,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (is_WS_OR_EOL(ch)      ||
+      is_FLOW_INDICATOR(ch) ||
+      ch === 0x23/* # */    ||
+      ch === 0x26/* & */    ||
+      ch === 0x2A/* * */    ||
+      ch === 0x21/* ! */    ||
+      ch === 0x7C/* | */    ||
+      ch === 0x3E/* > */    ||
+      ch === 0x27/* ' */    ||
+      ch === 0x22/* " */    ||
+      ch === 0x25/* % */    ||
+      ch === 0x40/* @ */    ||
+      ch === 0x60/* ` */) {
+    return false;
+  }
+
+  if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (is_WS_OR_EOL(following) ||
+        withinFlowCollection && is_FLOW_INDICATOR(following)) {
+      return false;
+    }
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  captureStart = captureEnd = state.position;
+  hasPendingContent = false;
+
+  while (ch !== 0) {
+    if (ch === 0x3A/* : */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following) ||
+          withinFlowCollection && is_FLOW_INDICATOR(following)) {
+        break;
+      }
+
+    } else if (ch === 0x23/* # */) {
+      preceding = state.input.charCodeAt(state.position - 1);
+
+      if (is_WS_OR_EOL(preceding)) {
+        break;
+      }
+
+    } else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
+               withinFlowCollection && is_FLOW_INDICATOR(ch)) {
+      break;
+
+    } else if (is_EOL(ch)) {
+      _line = state.line;
+      _lineStart = state.lineStart;
+      _lineIndent = state.lineIndent;
+      skipSeparationSpace(state, false, -1);
+
+      if (state.lineIndent >= nodeIndent) {
+        hasPendingContent = true;
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      } else {
+        state.position = captureEnd;
+        state.line = _line;
+        state.lineStart = _lineStart;
+        state.lineIndent = _lineIndent;
+        break;
+      }
+    }
+
+    if (hasPendingContent) {
+      captureSegment(state, captureStart, captureEnd, false);
+      writeFoldedLines(state, state.line - _line);
+      captureStart = captureEnd = state.position;
+      hasPendingContent = false;
+    }
+
+    if (!is_WHITE_SPACE(ch)) {
+      captureEnd = state.position + 1;
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  captureSegment(state, captureStart, captureEnd, false);
+
+  if (state.result) {
+    return true;
+  }
+
+  state.kind = _kind;
+  state.result = _result;
+  return false;
+}
+
+function readSingleQuotedScalar(state, nodeIndent) {
+  var ch,
+      captureStart, captureEnd;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x27/* ' */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x27/* ' */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (ch === 0x27/* ' */) {
+        captureStart = state.position;
+        state.position++;
+        captureEnd = state.position;
+      } else {
+        return true;
+      }
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a single quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a single quoted scalar');
+}
+
+function readDoubleQuotedScalar(state, nodeIndent) {
+  var captureStart,
+      captureEnd,
+      hexLength,
+      hexResult,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x22/* " */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x22/* " */) {
+      captureSegment(state, captureStart, state.position, true);
+      state.position++;
+      return true;
+
+    } else if (ch === 0x5C/* \ */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (is_EOL(ch)) {
+        skipSeparationSpace(state, false, nodeIndent);
+
+        // TODO: rework to inline fn with no type cast?
+      } else if (ch < 256 && simpleEscapeCheck[ch]) {
+        state.result += simpleEscapeMap[ch];
+        state.position++;
+
+      } else if ((tmp = escapedHexLen(ch)) > 0) {
+        hexLength = tmp;
+        hexResult = 0;
+
+        for (; hexLength > 0; hexLength--) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if ((tmp = fromHexCode(ch)) >= 0) {
+            hexResult = (hexResult << 4) + tmp;
+
+          } else {
+            throwError(state, 'expected hexadecimal character');
+          }
+        }
+
+        state.result += charFromCodepoint(hexResult);
+
+        state.position++;
+
+      } else {
+        throwError(state, 'unknown escape sequence');
+      }
+
+      captureStart = captureEnd = state.position;
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a double quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a double quoted scalar');
+}
+
+function readFlowCollection(state, nodeIndent) {
+  var readNext = true,
+      _line,
+      _lineStart,
+      _pos,
+      _tag     = state.tag,
+      _result,
+      _anchor  = state.anchor,
+      following,
+      terminator,
+      isPair,
+      isExplicitPair,
+      isMapping,
+      overridableKeys = Object.create(null),
+      keyNode,
+      keyTag,
+      valueNode,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x5B/* [ */) {
+    terminator = 0x5D;/* ] */
+    isMapping = false;
+    _result = [];
+  } else if (ch === 0x7B/* { */) {
+    terminator = 0x7D;/* } */
+    isMapping = true;
+    _result = {};
+  } else {
+    return false;
+  }
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  while (ch !== 0) {
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === terminator) {
+      state.position++;
+      state.tag = _tag;
+      state.anchor = _anchor;
+      state.kind = isMapping ? 'mapping' : 'sequence';
+      state.result = _result;
+      return true;
+    } else if (!readNext) {
+      throwError(state, 'missed comma between flow collection entries');
+    } else if (ch === 0x2C/* , */) {
+      // "flow collection entries can never be completely empty", as per YAML 1.2, section 7.4
+      throwError(state, "expected the node content, but found ','");
+    }
+
+    keyTag = keyNode = valueNode = null;
+    isPair = isExplicitPair = false;
+
+    if (ch === 0x3F/* ? */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following)) {
+        isPair = isExplicitPair = true;
+        state.position++;
+        skipSeparationSpace(state, true, nodeIndent);
+      }
+    }
+
+    _line = state.line; // Save the current line.
+    _lineStart = state.lineStart;
+    _pos = state.position;
+    composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+    keyTag = state.tag;
+    keyNode = state.result;
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
+      isPair = true;
+      ch = state.input.charCodeAt(++state.position);
+      skipSeparationSpace(state, true, nodeIndent);
+      composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+      valueNode = state.result;
+    }
+
+    if (isMapping) {
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos);
+    } else if (isPair) {
+      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos));
+    } else {
+      _result.push(keyNode);
+    }
+
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x2C/* , */) {
+      readNext = true;
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      readNext = false;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a flow collection');
+}
+
+function readBlockScalar(state, nodeIndent) {
+  var captureStart,
+      folding,
+      chomping       = CHOMPING_CLIP,
+      didReadContent = false,
+      detectedIndent = false,
+      textIndent     = nodeIndent,
+      emptyLines     = 0,
+      atMoreIndented = false,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x7C/* | */) {
+    folding = false;
+  } else if (ch === 0x3E/* > */) {
+    folding = true;
+  } else {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+
+  while (ch !== 0) {
+    ch = state.input.charCodeAt(++state.position);
+
+    if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
+      if (CHOMPING_CLIP === chomping) {
+        chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
+      } else {
+        throwError(state, 'repeat of a chomping mode identifier');
+      }
+
+    } else if ((tmp = fromDecimalCode(ch)) >= 0) {
+      if (tmp === 0) {
+        throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
+      } else if (!detectedIndent) {
+        textIndent = nodeIndent + tmp - 1;
+        detectedIndent = true;
+      } else {
+        throwError(state, 'repeat of an indentation width identifier');
+      }
+
+    } else {
+      break;
+    }
+  }
+
+  if (is_WHITE_SPACE(ch)) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (is_WHITE_SPACE(ch));
+
+    if (ch === 0x23/* # */) {
+      do { ch = state.input.charCodeAt(++state.position); }
+      while (!is_EOL(ch) && (ch !== 0));
+    }
+  }
+
+  while (ch !== 0) {
+    readLineBreak(state);
+    state.lineIndent = 0;
+
+    ch = state.input.charCodeAt(state.position);
+
+    while ((!detectedIndent || state.lineIndent < textIndent) &&
+           (ch === 0x20/* Space */)) {
+      state.lineIndent++;
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (!detectedIndent && state.lineIndent > textIndent) {
+      textIndent = state.lineIndent;
+    }
+
+    if (is_EOL(ch)) {
+      emptyLines++;
+      continue;
+    }
+
+    // End of the scalar.
+    if (state.lineIndent < textIndent) {
+
+      // Perform the chomping.
+      if (chomping === CHOMPING_KEEP) {
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+      } else if (chomping === CHOMPING_CLIP) {
+        if (didReadContent) { // i.e. only if the scalar is not empty.
+          state.result += '\n';
+        }
+      }
+
+      // Break this `while` cycle and go to the funciton's epilogue.
+      break;
+    }
+
+    // Folded style: use fancy rules to handle line breaks.
+    if (folding) {
+
+      // Lines starting with white space characters (more-indented lines) are not folded.
+      if (is_WHITE_SPACE(ch)) {
+        atMoreIndented = true;
+        // except for the first content line (cf. Example 8.1)
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+
+      // End of more-indented block.
+      } else if (atMoreIndented) {
+        atMoreIndented = false;
+        state.result += common.repeat('\n', emptyLines + 1);
+
+      // Just one line break - perceive as the same line.
+      } else if (emptyLines === 0) {
+        if (didReadContent) { // i.e. only if we have already read some scalar content.
+          state.result += ' ';
+        }
+
+      // Several line breaks - perceive as different lines.
+      } else {
+        state.result += common.repeat('\n', emptyLines);
+      }
+
+    // Literal style: just add exact number of line breaks between content lines.
+    } else {
+      // Keep all line breaks except the header line break.
+      state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+    }
+
+    didReadContent = true;
+    detectedIndent = true;
+    emptyLines = 0;
+    captureStart = state.position;
+
+    while (!is_EOL(ch) && (ch !== 0)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    captureSegment(state, captureStart, state.position, false);
+  }
+
+  return true;
+}
+
+function readBlockSequence(state, nodeIndent) {
+  var _line,
+      _tag      = state.tag,
+      _anchor   = state.anchor,
+      _result   = [],
+      following,
+      detected  = false,
+      ch;
+
+  // there is a leading tab before this token, so it can't be a block sequence/mapping;
+  // it can still be flow sequence/mapping or a scalar
+  if (state.firstTabInLine !== -1) return false;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    if (state.firstTabInLine !== -1) {
+      state.position = state.firstTabInLine;
+      throwError(state, 'tab characters must not be used in indentation');
+    }
+
+    if (ch !== 0x2D/* - */) {
+      break;
+    }
+
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (!is_WS_OR_EOL(following)) {
+      break;
+    }
+
+    detected = true;
+    state.position++;
+
+    if (skipSeparationSpace(state, true, -1)) {
+      if (state.lineIndent <= nodeIndent) {
+        _result.push(null);
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      }
+    }
+
+    _line = state.line;
+    composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
+    _result.push(state.result);
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+      throwError(state, 'bad indentation of a sequence entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'sequence';
+    state.result = _result;
+    return true;
+  }
+  return false;
+}
+
+function readBlockMapping(state, nodeIndent, flowIndent) {
+  var following,
+      allowCompact,
+      _line,
+      _keyLine,
+      _keyLineStart,
+      _keyPos,
+      _tag          = state.tag,
+      _anchor       = state.anchor,
+      _result       = {},
+      overridableKeys = Object.create(null),
+      keyTag        = null,
+      keyNode       = null,
+      valueNode     = null,
+      atExplicitKey = false,
+      detected      = false,
+      ch;
+
+  // there is a leading tab before this token, so it can't be a block sequence/mapping;
+  // it can still be flow sequence/mapping or a scalar
+  if (state.firstTabInLine !== -1) return false;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    if (!atExplicitKey && state.firstTabInLine !== -1) {
+      state.position = state.firstTabInLine;
+      throwError(state, 'tab characters must not be used in indentation');
+    }
+
+    following = state.input.charCodeAt(state.position + 1);
+    _line = state.line; // Save the current line.
+
+    //
+    // Explicit notation case. There are two separate blocks:
+    // first for the key (denoted by "?") and second for the value (denoted by ":")
+    //
+    if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
+
+      if (ch === 0x3F/* ? */) {
+        if (atExplicitKey) {
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+          keyTag = keyNode = valueNode = null;
+        }
+
+        detected = true;
+        atExplicitKey = true;
+        allowCompact = true;
+
+      } else if (atExplicitKey) {
+        // i.e. 0x3A/* : */ === character after the explicit key.
+        atExplicitKey = false;
+        allowCompact = true;
+
+      } else {
+        throwError(state, 'incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line');
+      }
+
+      state.position += 1;
+      ch = following;
+
+    //
+    // Implicit notation case. Flow-style node as the key first, then ":", and the value.
+    //
+    } else {
+      _keyLine = state.line;
+      _keyLineStart = state.lineStart;
+      _keyPos = state.position;
+
+      if (!composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+        // Neither implicit nor explicit notation.
+        // Reading is done. Go to the epilogue.
+        break;
+      }
+
+      if (state.line === _line) {
+        ch = state.input.charCodeAt(state.position);
+
+        while (is_WHITE_SPACE(ch)) {
+          ch = state.input.charCodeAt(++state.position);
+        }
+
+        if (ch === 0x3A/* : */) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if (!is_WS_OR_EOL(ch)) {
+            throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
+          }
+
+          if (atExplicitKey) {
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+            keyTag = keyNode = valueNode = null;
+          }
+
+          detected = true;
+          atExplicitKey = false;
+          allowCompact = false;
+          keyTag = state.tag;
+          keyNode = state.result;
+
+        } else if (detected) {
+          throwError(state, 'can not read an implicit mapping pair; a colon is missed');
+
+        } else {
+          state.tag = _tag;
+          state.anchor = _anchor;
+          return true; // Keep the result of `composeNode`.
+        }
+
+      } else if (detected) {
+        throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');
+
+      } else {
+        state.tag = _tag;
+        state.anchor = _anchor;
+        return true; // Keep the result of `composeNode`.
+      }
+    }
+
+    //
+    // Common reading code for both explicit and implicit notations.
+    //
+    if (state.line === _line || state.lineIndent > nodeIndent) {
+      if (atExplicitKey) {
+        _keyLine = state.line;
+        _keyLineStart = state.lineStart;
+        _keyPos = state.position;
+      }
+
+      if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
+        if (atExplicitKey) {
+          keyNode = state.result;
+        } else {
+          valueNode = state.result;
+        }
+      }
+
+      if (!atExplicitKey) {
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _keyLine, _keyLineStart, _keyPos);
+        keyTag = keyNode = valueNode = null;
+      }
+
+      skipSeparationSpace(state, true, -1);
+      ch = state.input.charCodeAt(state.position);
+    }
+
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+      throwError(state, 'bad indentation of a mapping entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  //
+  // Epilogue.
+  //
+
+  // Special case: last mapping's node contains only the key in explicit notation.
+  if (atExplicitKey) {
+    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+  }
+
+  // Expose the resulting mapping.
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'mapping';
+    state.result = _result;
+  }
+
+  return detected;
+}
+
+function readTagProperty(state) {
+  var _position,
+      isVerbatim = false,
+      isNamed    = false,
+      tagHandle,
+      tagName,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x21/* ! */) return false;
+
+  if (state.tag !== null) {
+    throwError(state, 'duplication of a tag property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  if (ch === 0x3C/* < */) {
+    isVerbatim = true;
+    ch = state.input.charCodeAt(++state.position);
+
+  } else if (ch === 0x21/* ! */) {
+    isNamed = true;
+    tagHandle = '!!';
+    ch = state.input.charCodeAt(++state.position);
+
+  } else {
+    tagHandle = '!';
+  }
+
+  _position = state.position;
+
+  if (isVerbatim) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (ch !== 0 && ch !== 0x3E/* > */);
+
+    if (state.position < state.length) {
+      tagName = state.input.slice(_position, state.position);
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      throwError(state, 'unexpected end of the stream within a verbatim tag');
+    }
+  } else {
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+
+      if (ch === 0x21/* ! */) {
+        if (!isNamed) {
+          tagHandle = state.input.slice(_position - 1, state.position + 1);
+
+          if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
+            throwError(state, 'named tag handle cannot contain such characters');
+          }
+
+          isNamed = true;
+          _position = state.position + 1;
+        } else {
+          throwError(state, 'tag suffix cannot contain exclamation marks');
+        }
+      }
+
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    tagName = state.input.slice(_position, state.position);
+
+    if (PATTERN_FLOW_INDICATORS.test(tagName)) {
+      throwError(state, 'tag suffix cannot contain flow indicator characters');
+    }
+  }
+
+  if (tagName && !PATTERN_TAG_URI.test(tagName)) {
+    throwError(state, 'tag name cannot contain such characters: ' + tagName);
+  }
+
+  try {
+    tagName = decodeURIComponent(tagName);
+  } catch (err) {
+    throwError(state, 'tag name is malformed: ' + tagName);
+  }
+
+  if (isVerbatim) {
+    state.tag = tagName;
+
+  } else if (_hasOwnProperty$1.call(state.tagMap, tagHandle)) {
+    state.tag = state.tagMap[tagHandle] + tagName;
+
+  } else if (tagHandle === '!') {
+    state.tag = '!' + tagName;
+
+  } else if (tagHandle === '!!') {
+    state.tag = 'tag:yaml.org,2002:' + tagName;
+
+  } else {
+    throwError(state, 'undeclared tag handle "' + tagHandle + '"');
+  }
+
+  return true;
+}
+
+function readAnchorProperty(state) {
+  var _position,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x26/* & */) return false;
+
+  if (state.anchor !== null) {
+    throwError(state, 'duplication of an anchor property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an anchor node must contain at least one character');
+  }
+
+  state.anchor = state.input.slice(_position, state.position);
+  return true;
+}
+
+function readAlias(state) {
+  var _position, alias,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x2A/* * */) return false;
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an alias node must contain at least one character');
+  }
+
+  alias = state.input.slice(_position, state.position);
+
+  if (!_hasOwnProperty$1.call(state.anchorMap, alias)) {
+    throwError(state, 'unidentified alias "' + alias + '"');
+  }
+
+  state.result = state.anchorMap[alias];
+  skipSeparationSpace(state, true, -1);
+  return true;
+}
+
+function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
+  var allowBlockStyles,
+      allowBlockScalars,
+      allowBlockCollections,
+      indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
+      atNewLine  = false,
+      hasContent = false,
+      typeIndex,
+      typeQuantity,
+      typeList,
+      type,
+      flowIndent,
+      blockIndent;
+
+  if (state.listener !== null) {
+    state.listener('open', state);
+  }
+
+  state.tag    = null;
+  state.anchor = null;
+  state.kind   = null;
+  state.result = null;
+
+  allowBlockStyles = allowBlockScalars = allowBlockCollections =
+    CONTEXT_BLOCK_OUT === nodeContext ||
+    CONTEXT_BLOCK_IN  === nodeContext;
+
+  if (allowToSeek) {
+    if (skipSeparationSpace(state, true, -1)) {
+      atNewLine = true;
+
+      if (state.lineIndent > parentIndent) {
+        indentStatus = 1;
+      } else if (state.lineIndent === parentIndent) {
+        indentStatus = 0;
+      } else if (state.lineIndent < parentIndent) {
+        indentStatus = -1;
+      }
+    }
+  }
+
+  if (indentStatus === 1) {
+    while (readTagProperty(state) || readAnchorProperty(state)) {
+      if (skipSeparationSpace(state, true, -1)) {
+        atNewLine = true;
+        allowBlockCollections = allowBlockStyles;
+
+        if (state.lineIndent > parentIndent) {
+          indentStatus = 1;
+        } else if (state.lineIndent === parentIndent) {
+          indentStatus = 0;
+        } else if (state.lineIndent < parentIndent) {
+          indentStatus = -1;
+        }
+      } else {
+        allowBlockCollections = false;
+      }
+    }
+  }
+
+  if (allowBlockCollections) {
+    allowBlockCollections = atNewLine || allowCompact;
+  }
+
+  if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
+    if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
+      flowIndent = parentIndent;
+    } else {
+      flowIndent = parentIndent + 1;
+    }
+
+    blockIndent = state.position - state.lineStart;
+
+    if (indentStatus === 1) {
+      if (allowBlockCollections &&
+          (readBlockSequence(state, blockIndent) ||
+           readBlockMapping(state, blockIndent, flowIndent)) ||
+          readFlowCollection(state, flowIndent)) {
+        hasContent = true;
+      } else {
+        if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
+            readSingleQuotedScalar(state, flowIndent) ||
+            readDoubleQuotedScalar(state, flowIndent)) {
+          hasContent = true;
+
+        } else if (readAlias(state)) {
+          hasContent = true;
+
+          if (state.tag !== null || state.anchor !== null) {
+            throwError(state, 'alias node should not have any properties');
+          }
+
+        } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
+          hasContent = true;
+
+          if (state.tag === null) {
+            state.tag = '?';
+          }
+        }
+
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    } else if (indentStatus === 0) {
+      // Special case: block sequences are allowed to have same indentation level as the parent.
+      // http://www.yaml.org/spec/1.2/spec.html#id2799784
+      hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
+    }
+  }
+
+  if (state.tag === null) {
+    if (state.anchor !== null) {
+      state.anchorMap[state.anchor] = state.result;
+    }
+
+  } else if (state.tag === '?') {
+    // Implicit resolving is not allowed for non-scalar types, and '?'
+    // non-specific tag is only automatically assigned to plain scalars.
+    //
+    // We only need to check kind conformity in case user explicitly assigns '?'
+    // tag, for example like this: "!<?> [0]"
+    //
+    if (state.result !== null && state.kind !== 'scalar') {
+      throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
+    }
+
+    for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
+      type = state.implicitTypes[typeIndex];
+
+      if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
+        state.result = type.construct(state.result);
+        state.tag = type.tag;
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+        break;
+      }
+    }
+  } else if (state.tag !== '!') {
+    if (_hasOwnProperty$1.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+      type = state.typeMap[state.kind || 'fallback'][state.tag];
+    } else {
+      // looking for multi type
+      type = null;
+      typeList = state.typeMap.multi[state.kind || 'fallback'];
+
+      for (typeIndex = 0, typeQuantity = typeList.length; typeIndex < typeQuantity; typeIndex += 1) {
+        if (state.tag.slice(0, typeList[typeIndex].tag.length) === typeList[typeIndex].tag) {
+          type = typeList[typeIndex];
+          break;
+        }
+      }
+    }
+
+    if (!type) {
+      throwError(state, 'unknown tag !<' + state.tag + '>');
+    }
+
+    if (state.result !== null && type.kind !== state.kind) {
+      throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+    }
+
+    if (!type.resolve(state.result, state.tag)) { // `state.result` updated in resolver if matched
+      throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+    } else {
+      state.result = type.construct(state.result, state.tag);
+      if (state.anchor !== null) {
+        state.anchorMap[state.anchor] = state.result;
+      }
+    }
+  }
+
+  if (state.listener !== null) {
+    state.listener('close', state);
+  }
+  return state.tag !== null ||  state.anchor !== null || hasContent;
+}
+
+function readDocument(state) {
+  var documentStart = state.position,
+      _position,
+      directiveName,
+      directiveArgs,
+      hasDirectives = false,
+      ch;
+
+  state.version = null;
+  state.checkLineBreaks = state.legacy;
+  state.tagMap = Object.create(null);
+  state.anchorMap = Object.create(null);
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (state.lineIndent > 0 || ch !== 0x25/* % */) {
+      break;
+    }
+
+    hasDirectives = true;
+    ch = state.input.charCodeAt(++state.position);
+    _position = state.position;
+
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    directiveName = state.input.slice(_position, state.position);
+    directiveArgs = [];
+
+    if (directiveName.length < 1) {
+      throwError(state, 'directive name must not be less than one character in length');
+    }
+
+    while (ch !== 0) {
+      while (is_WHITE_SPACE(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      if (ch === 0x23/* # */) {
+        do { ch = state.input.charCodeAt(++state.position); }
+        while (ch !== 0 && !is_EOL(ch));
+        break;
+      }
+
+      if (is_EOL(ch)) break;
+
+      _position = state.position;
+
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      directiveArgs.push(state.input.slice(_position, state.position));
+    }
+
+    if (ch !== 0) readLineBreak(state);
+
+    if (_hasOwnProperty$1.call(directiveHandlers, directiveName)) {
+      directiveHandlers[directiveName](state, directiveName, directiveArgs);
+    } else {
+      throwWarning(state, 'unknown document directive "' + directiveName + '"');
+    }
+  }
+
+  skipSeparationSpace(state, true, -1);
+
+  if (state.lineIndent === 0 &&
+      state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
+    state.position += 3;
+    skipSeparationSpace(state, true, -1);
+
+  } else if (hasDirectives) {
+    throwError(state, 'directives end mark is expected');
+  }
+
+  composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
+  skipSeparationSpace(state, true, -1);
+
+  if (state.checkLineBreaks &&
+      PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
+    throwWarning(state, 'non-ASCII line breaks are interpreted as content');
+  }
+
+  state.documents.push(state.result);
+
+  if (state.position === state.lineStart && testDocumentSeparator(state)) {
+
+    if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
+      state.position += 3;
+      skipSeparationSpace(state, true, -1);
+    }
+    return;
+  }
+
+  if (state.position < (state.length - 1)) {
+    throwError(state, 'end of the stream or a document separator is expected');
+  } else {
+    return;
+  }
+}
+
+
+function loadDocuments(input, options) {
+  input = String(input);
+  options = options || {};
+
+  if (input.length !== 0) {
+
+    // Add tailing `\n` if not exists
+    if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
+        input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
+      input += '\n';
+    }
+
+    // Strip BOM
+    if (input.charCodeAt(0) === 0xFEFF) {
+      input = input.slice(1);
+    }
+  }
+
+  var state = new State$1(input, options);
+
+  var nullpos = input.indexOf('\0');
+
+  if (nullpos !== -1) {
+    state.position = nullpos;
+    throwError(state, 'null byte is not allowed in input');
+  }
+
+  // Use 0 as string terminator. That significantly simplifies bounds check.
+  state.input += '\0';
+
+  while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
+    state.lineIndent += 1;
+    state.position += 1;
+  }
+
+  while (state.position < (state.length - 1)) {
+    readDocument(state);
+  }
+
+  return state.documents;
+}
+
+
+function loadAll$1(input, iterator, options) {
+  if (iterator !== null && typeof iterator === 'object' && typeof options === 'undefined') {
+    options = iterator;
+    iterator = null;
+  }
+
+  var documents = loadDocuments(input, options);
+
+  if (typeof iterator !== 'function') {
+    return documents;
+  }
+
+  for (var index = 0, length = documents.length; index < length; index += 1) {
+    iterator(documents[index]);
+  }
+}
+
+
+function load$1(input, options) {
+  var documents = loadDocuments(input, options);
+
+  if (documents.length === 0) {
+    /*eslint-disable no-undefined*/
+    return undefined;
+  } else if (documents.length === 1) {
+    return documents[0];
+  }
+  throw new exception('expected a single document in the stream, but found more');
+}
+
+
+var loadAll_1 = loadAll$1;
+var load_1    = load$1;
+
+var loader = {
+	loadAll: loadAll_1,
+	load: load_1
+};
+
+/*eslint-disable no-use-before-define*/
+
+
+
+
+
+var _toString       = Object.prototype.toString;
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+var CHAR_BOM                  = 0xFEFF;
+var CHAR_TAB                  = 0x09; /* Tab */
+var CHAR_LINE_FEED            = 0x0A; /* LF */
+var CHAR_CARRIAGE_RETURN      = 0x0D; /* CR */
+var CHAR_SPACE                = 0x20; /* Space */
+var CHAR_EXCLAMATION          = 0x21; /* ! */
+var CHAR_DOUBLE_QUOTE         = 0x22; /* " */
+var CHAR_SHARP                = 0x23; /* # */
+var CHAR_PERCENT              = 0x25; /* % */
+var CHAR_AMPERSAND            = 0x26; /* & */
+var CHAR_SINGLE_QUOTE         = 0x27; /* ' */
+var CHAR_ASTERISK             = 0x2A; /* * */
+var CHAR_COMMA                = 0x2C; /* , */
+var CHAR_MINUS                = 0x2D; /* - */
+var CHAR_COLON                = 0x3A; /* : */
+var CHAR_EQUALS               = 0x3D; /* = */
+var CHAR_GREATER_THAN         = 0x3E; /* > */
+var CHAR_QUESTION             = 0x3F; /* ? */
+var CHAR_COMMERCIAL_AT        = 0x40; /* @ */
+var CHAR_LEFT_SQUARE_BRACKET  = 0x5B; /* [ */
+var CHAR_RIGHT_SQUARE_BRACKET = 0x5D; /* ] */
+var CHAR_GRAVE_ACCENT         = 0x60; /* ` */
+var CHAR_LEFT_CURLY_BRACKET   = 0x7B; /* { */
+var CHAR_VERTICAL_LINE        = 0x7C; /* | */
+var CHAR_RIGHT_CURLY_BRACKET  = 0x7D; /* } */
+
+var ESCAPE_SEQUENCES = {};
+
+ESCAPE_SEQUENCES[0x00]   = '\\0';
+ESCAPE_SEQUENCES[0x07]   = '\\a';
+ESCAPE_SEQUENCES[0x08]   = '\\b';
+ESCAPE_SEQUENCES[0x09]   = '\\t';
+ESCAPE_SEQUENCES[0x0A]   = '\\n';
+ESCAPE_SEQUENCES[0x0B]   = '\\v';
+ESCAPE_SEQUENCES[0x0C]   = '\\f';
+ESCAPE_SEQUENCES[0x0D]   = '\\r';
+ESCAPE_SEQUENCES[0x1B]   = '\\e';
+ESCAPE_SEQUENCES[0x22]   = '\\"';
+ESCAPE_SEQUENCES[0x5C]   = '\\\\';
+ESCAPE_SEQUENCES[0x85]   = '\\N';
+ESCAPE_SEQUENCES[0xA0]   = '\\_';
+ESCAPE_SEQUENCES[0x2028] = '\\L';
+ESCAPE_SEQUENCES[0x2029] = '\\P';
+
+var DEPRECATED_BOOLEANS_SYNTAX = [
+  'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
+  'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
+];
+
+var DEPRECATED_BASE60_SYNTAX = /^[-+]?[0-9_]+(?::[0-9_]+)+(?:\.[0-9_]*)?$/;
+
+function compileStyleMap(schema, map) {
+  var result, keys, index, length, tag, style, type;
+
+  if (map === null) return {};
+
+  result = {};
+  keys = Object.keys(map);
+
+  for (index = 0, length = keys.length; index < length; index += 1) {
+    tag = keys[index];
+    style = String(map[tag]);
+
+    if (tag.slice(0, 2) === '!!') {
+      tag = 'tag:yaml.org,2002:' + tag.slice(2);
+    }
+    type = schema.compiledTypeMap['fallback'][tag];
+
+    if (type && _hasOwnProperty.call(type.styleAliases, style)) {
+      style = type.styleAliases[style];
+    }
+
+    result[tag] = style;
+  }
+
+  return result;
+}
+
+function encodeHex(character) {
+  var string, handle, length;
+
+  string = character.toString(16).toUpperCase();
+
+  if (character <= 0xFF) {
+    handle = 'x';
+    length = 2;
+  } else if (character <= 0xFFFF) {
+    handle = 'u';
+    length = 4;
+  } else if (character <= 0xFFFFFFFF) {
+    handle = 'U';
+    length = 8;
+  } else {
+    throw new exception('code point within a string may not be greater than 0xFFFFFFFF');
+  }
+
+  return '\\' + handle + common.repeat('0', length - string.length) + string;
+}
+
+
+var QUOTING_TYPE_SINGLE = 1,
+    QUOTING_TYPE_DOUBLE = 2;
+
+function State(options) {
+  this.schema        = options['schema'] || _default;
+  this.indent        = Math.max(1, (options['indent'] || 2));
+  this.noArrayIndent = options['noArrayIndent'] || false;
+  this.skipInvalid   = options['skipInvalid'] || false;
+  this.flowLevel     = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+  this.styleMap      = compileStyleMap(this.schema, options['styles'] || null);
+  this.sortKeys      = options['sortKeys'] || false;
+  this.lineWidth     = options['lineWidth'] || 80;
+  this.noRefs        = options['noRefs'] || false;
+  this.noCompatMode  = options['noCompatMode'] || false;
+  this.condenseFlow  = options['condenseFlow'] || false;
+  this.quotingType   = options['quotingType'] === '"' ? QUOTING_TYPE_DOUBLE : QUOTING_TYPE_SINGLE;
+  this.forceQuotes   = options['forceQuotes'] || false;
+  this.replacer      = typeof options['replacer'] === 'function' ? options['replacer'] : null;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.explicitTypes = this.schema.compiledExplicit;
+
+  this.tag = null;
+  this.result = '';
+
+  this.duplicates = [];
+  this.usedDuplicates = null;
+}
+
+// Indents every line in a string. Empty lines (\n only) are not indented.
+function indentString(string, spaces) {
+  var ind = common.repeat(' ', spaces),
+      position = 0,
+      next = -1,
+      result = '',
+      line,
+      length = string.length;
+
+  while (position < length) {
+    next = string.indexOf('\n', position);
+    if (next === -1) {
+      line = string.slice(position);
+      position = length;
+    } else {
+      line = string.slice(position, next + 1);
+      position = next + 1;
+    }
+
+    if (line.length && line !== '\n') result += ind;
+
+    result += line;
+  }
+
+  return result;
+}
+
+function generateNextLine(state, level) {
+  return '\n' + common.repeat(' ', state.indent * level);
+}
+
+function testImplicitResolving(state, str) {
+  var index, length, type;
+
+  for (index = 0, length = state.implicitTypes.length; index < length; index += 1) {
+    type = state.implicitTypes[index];
+
+    if (type.resolve(str)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// [33] s-white ::= s-space | s-tab
+function isWhitespace(c) {
+  return c === CHAR_SPACE || c === CHAR_TAB;
+}
+
+// Returns true if the character can be printed without escaping.
+// From YAML 1.2: "any allowed characters known to be non-printable
+// should also be escaped. [However,] This isn’t mandatory"
+// Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
+function isPrintable(c) {
+  return  (0x00020 <= c && c <= 0x00007E)
+      || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
+      || ((0x0E000 <= c && c <= 0x00FFFD) && c !== CHAR_BOM)
+      ||  (0x10000 <= c && c <= 0x10FFFF);
+}
+
+// [34] ns-char ::= nb-char - s-white
+// [27] nb-char ::= c-printable - b-char - c-byte-order-mark
+// [26] b-char  ::= b-line-feed | b-carriage-return
+// Including s-white (for some reason, examples doesn't match specs in this aspect)
+// ns-char ::= c-printable - b-line-feed - b-carriage-return - c-byte-order-mark
+function isNsCharOrWhitespace(c) {
+  return isPrintable(c)
+    && c !== CHAR_BOM
+    // - b-char
+    && c !== CHAR_CARRIAGE_RETURN
+    && c !== CHAR_LINE_FEED;
+}
+
+// [127]  ns-plain-safe(c) ::= c = flow-out  ⇒ ns-plain-safe-out
+//                             c = flow-in   ⇒ ns-plain-safe-in
+//                             c = block-key ⇒ ns-plain-safe-out
+//                             c = flow-key  ⇒ ns-plain-safe-in
+// [128] ns-plain-safe-out ::= ns-char
+// [129]  ns-plain-safe-in ::= ns-char - c-flow-indicator
+// [130]  ns-plain-char(c) ::=  ( ns-plain-safe(c) - “:” - “#” )
+//                            | ( /* An ns-char preceding */ “#” )
+//                            | ( “:” /* Followed by an ns-plain-safe(c) */ )
+function isPlainSafe(c, prev, inblock) {
+  var cIsNsCharOrWhitespace = isNsCharOrWhitespace(c);
+  var cIsNsChar = cIsNsCharOrWhitespace && !isWhitespace(c);
+  return (
+    // ns-plain-safe
+    inblock ? // c = flow-in
+      cIsNsCharOrWhitespace
+      : cIsNsCharOrWhitespace
+        // - c-flow-indicator
+        && c !== CHAR_COMMA
+        && c !== CHAR_LEFT_SQUARE_BRACKET
+        && c !== CHAR_RIGHT_SQUARE_BRACKET
+        && c !== CHAR_LEFT_CURLY_BRACKET
+        && c !== CHAR_RIGHT_CURLY_BRACKET
+  )
+    // ns-plain-char
+    && c !== CHAR_SHARP // false on '#'
+    && !(prev === CHAR_COLON && !cIsNsChar) // false on ': '
+    || (isNsCharOrWhitespace(prev) && !isWhitespace(prev) && c === CHAR_SHARP) // change to true on '[^ ]#'
+    || (prev === CHAR_COLON && cIsNsChar); // change to true on ':[^ ]'
+}
+
+// Simplified test for values allowed as the first character in plain style.
+function isPlainSafeFirst(c) {
+  // Uses a subset of ns-char - c-indicator
+  // where ns-char = nb-char - s-white.
+  // No support of ( ( “?” | “:” | “-” ) /* Followed by an ns-plain-safe(c)) */ ) part
+  return isPrintable(c) && c !== CHAR_BOM
+    && !isWhitespace(c) // - s-white
+    // - (c-indicator ::=
+    // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
+    && c !== CHAR_MINUS
+    && c !== CHAR_QUESTION
+    && c !== CHAR_COLON
+    && c !== CHAR_COMMA
+    && c !== CHAR_LEFT_SQUARE_BRACKET
+    && c !== CHAR_RIGHT_SQUARE_BRACKET
+    && c !== CHAR_LEFT_CURLY_BRACKET
+    && c !== CHAR_RIGHT_CURLY_BRACKET
+    // | “#” | “&” | “*” | “!” | “|” | “=” | “>” | “'” | “"”
+    && c !== CHAR_SHARP
+    && c !== CHAR_AMPERSAND
+    && c !== CHAR_ASTERISK
+    && c !== CHAR_EXCLAMATION
+    && c !== CHAR_VERTICAL_LINE
+    && c !== CHAR_EQUALS
+    && c !== CHAR_GREATER_THAN
+    && c !== CHAR_SINGLE_QUOTE
+    && c !== CHAR_DOUBLE_QUOTE
+    // | “%” | “@” | “`”)
+    && c !== CHAR_PERCENT
+    && c !== CHAR_COMMERCIAL_AT
+    && c !== CHAR_GRAVE_ACCENT;
+}
+
+// Simplified test for values allowed as the last character in plain style.
+function isPlainSafeLast(c) {
+  // just not whitespace or colon, it will be checked to be plain character later
+  return !isWhitespace(c) && c !== CHAR_COLON;
+}
+
+// Same as 'string'.codePointAt(pos), but works in older browsers.
+function codePointAt(string, pos) {
+  var first = string.charCodeAt(pos), second;
+  if (first >= 0xD800 && first <= 0xDBFF && pos + 1 < string.length) {
+    second = string.charCodeAt(pos + 1);
+    if (second >= 0xDC00 && second <= 0xDFFF) {
+      // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+      return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+    }
+  }
+  return first;
+}
+
+// Determines whether block indentation indicator is required.
+function needIndentIndicator(string) {
+  var leadingSpaceRe = /^\n* /;
+  return leadingSpaceRe.test(string);
+}
+
+var STYLE_PLAIN   = 1,
+    STYLE_SINGLE  = 2,
+    STYLE_LITERAL = 3,
+    STYLE_FOLDED  = 4,
+    STYLE_DOUBLE  = 5;
+
+// Determines which scalar styles are possible and returns the preferred style.
+// lineWidth = -1 => no limit.
+// Pre-conditions: str.length > 0.
+// Post-conditions:
+//    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
+//    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
+//    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
+function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth,
+  testAmbiguousType, quotingType, forceQuotes, inblock) {
+
+  var i;
+  var char = 0;
+  var prevChar = null;
+  var hasLineBreak = false;
+  var hasFoldableLine = false; // only checked if shouldTrackWidth
+  var shouldTrackWidth = lineWidth !== -1;
+  var previousLineBreak = -1; // count the first line correctly
+  var plain = isPlainSafeFirst(codePointAt(string, 0))
+          && isPlainSafeLast(codePointAt(string, string.length - 1));
+
+  if (singleLineOnly || forceQuotes) {
+    // Case: no block styles.
+    // Check for disallowed characters to rule out plain and single.
+    for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+      char = codePointAt(string, i);
+      if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char, prevChar, inblock);
+      prevChar = char;
+    }
+  } else {
+    // Case: block styles permitted.
+    for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+      char = codePointAt(string, i);
+      if (char === CHAR_LINE_FEED) {
+        hasLineBreak = true;
+        // Check if any line can be folded.
+        if (shouldTrackWidth) {
+          hasFoldableLine = hasFoldableLine ||
+            // Foldable line = too long, and not more-indented.
+            (i - previousLineBreak - 1 > lineWidth &&
+             string[previousLineBreak + 1] !== ' ');
+          previousLineBreak = i;
+        }
+      } else if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char, prevChar, inblock);
+      prevChar = char;
+    }
+    // in case the end is missing a \n
+    hasFoldableLine = hasFoldableLine || (shouldTrackWidth &&
+      (i - previousLineBreak - 1 > lineWidth &&
+       string[previousLineBreak + 1] !== ' '));
+  }
+  // Although every style can represent \n without escaping, prefer block styles
+  // for multiline, since they're more readable and they don't add empty lines.
+  // Also prefer folding a super-long line.
+  if (!hasLineBreak && !hasFoldableLine) {
+    // Strings interpretable as another type have to be quoted;
+    // e.g. the string 'true' vs. the boolean true.
+    if (plain && !forceQuotes && !testAmbiguousType(string)) {
+      return STYLE_PLAIN;
+    }
+    return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
+  }
+  // Edge case: block indentation indicator can only have one digit.
+  if (indentPerLevel > 9 && needIndentIndicator(string)) {
+    return STYLE_DOUBLE;
+  }
+  // At this point we know block styles are valid.
+  // Prefer literal style unless we want to fold.
+  if (!forceQuotes) {
+    return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+  }
+  return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
+}
+
+// Note: line breaking/folding is implemented for only the folded style.
+// NB. We drop the last trailing newline (if any) of a returned block scalar
+//  since the dumper adds its own newline. This always works:
+//    • No ending newline => unaffected; already using strip "-" chomping.
+//    • Ending newline    => removed then restored.
+//  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
+function writeScalar(state, string, level, iskey, inblock) {
+  state.dump = (function () {
+    if (string.length === 0) {
+      return state.quotingType === QUOTING_TYPE_DOUBLE ? '""' : "''";
+    }
+    if (!state.noCompatMode) {
+      if (DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1 || DEPRECATED_BASE60_SYNTAX.test(string)) {
+        return state.quotingType === QUOTING_TYPE_DOUBLE ? ('"' + string + '"') : ("'" + string + "'");
+      }
+    }
+
+    var indent = state.indent * Math.max(1, level); // no 0-indent scalars
+    // As indentation gets deeper, let the width decrease monotonically
+    // to the lower bound min(state.lineWidth, 40).
+    // Note that this implies
+    //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
+    //  state.lineWidth > 40 + state.indent: width decreases until the lower bound.
+    // This behaves better than a constant minimum width which disallows narrower options,
+    // or an indent threshold which causes the width to suddenly increase.
+    var lineWidth = state.lineWidth === -1
+      ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
+
+    // Without knowing if keys are implicit/explicit, assume implicit for safety.
+    var singleLineOnly = iskey
+      // No block styles in flow mode.
+      || (state.flowLevel > -1 && level >= state.flowLevel);
+    function testAmbiguity(string) {
+      return testImplicitResolving(state, string);
+    }
+
+    switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth,
+      testAmbiguity, state.quotingType, state.forceQuotes && !iskey, inblock)) {
+
+      case STYLE_PLAIN:
+        return string;
+      case STYLE_SINGLE:
+        return "'" + string.replace(/'/g, "''") + "'";
+      case STYLE_LITERAL:
+        return '|' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(string, indent));
+      case STYLE_FOLDED:
+        return '>' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(foldString(string, lineWidth), indent));
+      case STYLE_DOUBLE:
+        return '"' + escapeString(string) + '"';
+      default:
+        throw new exception('impossible error: invalid scalar style');
+    }
+  }());
+}
+
+// Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
+function blockHeader(string, indentPerLevel) {
+  var indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : '';
+
+  // note the special case: the string '\n' counts as a "trailing" empty line.
+  var clip =          string[string.length - 1] === '\n';
+  var keep = clip && (string[string.length - 2] === '\n' || string === '\n');
+  var chomp = keep ? '+' : (clip ? '' : '-');
+
+  return indentIndicator + chomp + '\n';
+}
+
+// (See the note for writeScalar.)
+function dropEndingNewline(string) {
+  return string[string.length - 1] === '\n' ? string.slice(0, -1) : string;
+}
+
+// Note: a long line without a suitable break point will exceed the width limit.
+// Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
+function foldString(string, width) {
+  // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
+  // unless they're before or after a more-indented line, or at the very
+  // beginning or end, in which case $k$ maps to $k$.
+  // Therefore, parse each chunk as newline(s) followed by a content line.
+  var lineRe = /(\n+)([^\n]*)/g;
+
+  // first line (possibly an empty line)
+  var result = (function () {
+    var nextLF = string.indexOf('\n');
+    nextLF = nextLF !== -1 ? nextLF : string.length;
+    lineRe.lastIndex = nextLF;
+    return foldLine(string.slice(0, nextLF), width);
+  }());
+  // If we haven't reached the first content line yet, don't add an extra \n.
+  var prevMoreIndented = string[0] === '\n' || string[0] === ' ';
+  var moreIndented;
+
+  // rest of the lines
+  var match;
+  while ((match = lineRe.exec(string))) {
+    var prefix = match[1], line = match[2];
+    moreIndented = (line[0] === ' ');
+    result += prefix
+      + (!prevMoreIndented && !moreIndented && line !== ''
+        ? '\n' : '')
+      + foldLine(line, width);
+    prevMoreIndented = moreIndented;
+  }
+
+  return result;
+}
+
+// Greedy line breaking.
+// Picks the longest line under the limit each time,
+// otherwise settles for the shortest line over the limit.
+// NB. More-indented lines *cannot* be folded, as that would add an extra \n.
+function foldLine(line, width) {
+  if (line === '' || line[0] === ' ') return line;
+
+  // Since a more-indented line adds a \n, breaks can't be followed by a space.
+  var breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
+  var match;
+  // start is an inclusive index. end, curr, and next are exclusive.
+  var start = 0, end, curr = 0, next = 0;
+  var result = '';
+
+  // Invariants: 0 <= start <= length-1.
+  //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
+  // Inside the loop:
+  //   A match implies length >= 2, so curr and next are <= length-2.
+  while ((match = breakRe.exec(line))) {
+    next = match.index;
+    // maintain invariant: curr - start <= width
+    if (next - start > width) {
+      end = (curr > start) ? curr : next; // derive end <= length-2
+      result += '\n' + line.slice(start, end);
+      // skip the space that was output as \n
+      start = end + 1;                    // derive start <= length-1
+    }
+    curr = next;
+  }
+
+  // By the invariants, start <= length-1, so there is something left over.
+  // It is either the whole string or a part starting from non-whitespace.
+  result += '\n';
+  // Insert a break if the remainder is too long and there is a break available.
+  if (line.length - start > width && curr > start) {
+    result += line.slice(start, curr) + '\n' + line.slice(curr + 1);
+  } else {
+    result += line.slice(start);
+  }
+
+  return result.slice(1); // drop extra \n joiner
+}
+
+// Escapes a double-quoted string.
+function escapeString(string) {
+  var result = '';
+  var char = 0;
+  var escapeSeq;
+
+  for (var i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+    char = codePointAt(string, i);
+    escapeSeq = ESCAPE_SEQUENCES[char];
+
+    if (!escapeSeq && isPrintable(char)) {
+      result += string[i];
+      if (char >= 0x10000) result += string[i + 1];
+    } else {
+      result += escapeSeq || encodeHex(char);
+    }
+  }
+
+  return result;
+}
+
+function writeFlowSequence(state, level, object) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length,
+      value;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    value = object[index];
+
+    if (state.replacer) {
+      value = state.replacer.call(object, String(index), value);
+    }
+
+    // Write only valid elements, put null instead of invalid elements.
+    if (writeNode(state, level, value, false, false) ||
+        (typeof value === 'undefined' &&
+         writeNode(state, level, null, false, false))) {
+
+      if (_result !== '') _result += ',' + (!state.condenseFlow ? ' ' : '');
+      _result += state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = '[' + _result + ']';
+}
+
+function writeBlockSequence(state, level, object, compact) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length,
+      value;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    value = object[index];
+
+    if (state.replacer) {
+      value = state.replacer.call(object, String(index), value);
+    }
+
+    // Write only valid elements, put null instead of invalid elements.
+    if (writeNode(state, level + 1, value, true, true, false, true) ||
+        (typeof value === 'undefined' &&
+         writeNode(state, level + 1, null, true, true, false, true))) {
+
+      if (!compact || _result !== '') {
+        _result += generateNextLine(state, level);
+      }
+
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        _result += '-';
+      } else {
+        _result += '- ';
+      }
+
+      _result += state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '[]'; // Empty sequence if no valid values.
+}
+
+function writeFlowMapping(state, level, object) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      pairBuffer;
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+
+    pairBuffer = '';
+    if (_result !== '') pairBuffer += ', ';
+
+    if (state.condenseFlow) pairBuffer += '"';
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (state.replacer) {
+      objectValue = state.replacer.call(object, objectKey, objectValue);
+    }
+
+    if (!writeNode(state, level, objectKey, false, false)) {
+      continue; // Skip this pair because of invalid key;
+    }
+
+    if (state.dump.length > 1024) pairBuffer += '? ';
+
+    pairBuffer += state.dump + (state.condenseFlow ? '"' : '') + ':' + (state.condenseFlow ? '' : ' ');
+
+    if (!writeNode(state, level, objectValue, false, false)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = '{' + _result + '}';
+}
+
+function writeBlockMapping(state, level, object, compact) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      explicitPair,
+      pairBuffer;
+
+  // Allow sorting keys so that the output file is deterministic
+  if (state.sortKeys === true) {
+    // Default sorting
+    objectKeyList.sort();
+  } else if (typeof state.sortKeys === 'function') {
+    // Custom sort function
+    objectKeyList.sort(state.sortKeys);
+  } else if (state.sortKeys) {
+    // Something is wrong
+    throw new exception('sortKeys must be a boolean or a function');
+  }
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+    pairBuffer = '';
+
+    if (!compact || _result !== '') {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (state.replacer) {
+      objectValue = state.replacer.call(object, objectKey, objectValue);
+    }
+
+    if (!writeNode(state, level + 1, objectKey, true, true, true)) {
+      continue; // Skip this pair because of invalid key.
+    }
+
+    explicitPair = (state.tag !== null && state.tag !== '?') ||
+                   (state.dump && state.dump.length > 1024);
+
+    if (explicitPair) {
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        pairBuffer += '?';
+      } else {
+        pairBuffer += '? ';
+      }
+    }
+
+    pairBuffer += state.dump;
+
+    if (explicitPair) {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+      pairBuffer += ':';
+    } else {
+      pairBuffer += ': ';
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '{}'; // Empty mapping if no valid pairs.
+}
+
+function detectType(state, object, explicit) {
+  var _result, typeList, index, length, type, style;
+
+  typeList = explicit ? state.explicitTypes : state.implicitTypes;
+
+  for (index = 0, length = typeList.length; index < length; index += 1) {
+    type = typeList[index];
+
+    if ((type.instanceOf  || type.predicate) &&
+        (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
+        (!type.predicate  || type.predicate(object))) {
+
+      if (explicit) {
+        if (type.multi && type.representName) {
+          state.tag = type.representName(object);
+        } else {
+          state.tag = type.tag;
+        }
+      } else {
+        state.tag = '?';
+      }
+
+      if (type.represent) {
+        style = state.styleMap[type.tag] || type.defaultStyle;
+
+        if (_toString.call(type.represent) === '[object Function]') {
+          _result = type.represent(object, style);
+        } else if (_hasOwnProperty.call(type.represent, style)) {
+          _result = type.represent[style](object, style);
+        } else {
+          throw new exception('!<' + type.tag + '> tag resolver accepts not "' + style + '" style');
+        }
+
+        state.dump = _result;
+      }
+
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// Serializes `object` and writes it to global `result`.
+// Returns true on success, or false on invalid object.
+//
+function writeNode(state, level, object, block, compact, iskey, isblockseq) {
+  state.tag = null;
+  state.dump = object;
+
+  if (!detectType(state, object, false)) {
+    detectType(state, object, true);
+  }
+
+  var type = _toString.call(state.dump);
+  var inblock = block;
+  var tagStr;
+
+  if (block) {
+    block = (state.flowLevel < 0 || state.flowLevel > level);
+  }
+
+  var objectOrArray = type === '[object Object]' || type === '[object Array]',
+      duplicateIndex,
+      duplicate;
+
+  if (objectOrArray) {
+    duplicateIndex = state.duplicates.indexOf(object);
+    duplicate = duplicateIndex !== -1;
+  }
+
+  if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
+    compact = false;
+  }
+
+  if (duplicate && state.usedDuplicates[duplicateIndex]) {
+    state.dump = '*ref_' + duplicateIndex;
+  } else {
+    if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
+      state.usedDuplicates[duplicateIndex] = true;
+    }
+    if (type === '[object Object]') {
+      if (block && (Object.keys(state.dump).length !== 0)) {
+        writeBlockMapping(state, level, state.dump, compact);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowMapping(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object Array]') {
+      if (block && (state.dump.length !== 0)) {
+        if (state.noArrayIndent && !isblockseq && level > 0) {
+          writeBlockSequence(state, level - 1, state.dump, compact);
+        } else {
+          writeBlockSequence(state, level, state.dump, compact);
+        }
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowSequence(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object String]') {
+      if (state.tag !== '?') {
+        writeScalar(state, state.dump, level, iskey, inblock);
+      }
+    } else if (type === '[object Undefined]') {
+      return false;
+    } else {
+      if (state.skipInvalid) return false;
+      throw new exception('unacceptable kind of an object to dump ' + type);
+    }
+
+    if (state.tag !== null && state.tag !== '?') {
+      // Need to encode all characters except those allowed by the spec:
+      //
+      // [35] ns-dec-digit    ::=  [#x30-#x39] /* 0-9 */
+      // [36] ns-hex-digit    ::=  ns-dec-digit
+      //                         | [#x41-#x46] /* A-F */ | [#x61-#x66] /* a-f */
+      // [37] ns-ascii-letter ::=  [#x41-#x5A] /* A-Z */ | [#x61-#x7A] /* a-z */
+      // [38] ns-word-char    ::=  ns-dec-digit | ns-ascii-letter | “-”
+      // [39] ns-uri-char     ::=  “%” ns-hex-digit ns-hex-digit | ns-word-char | “#”
+      //                         | “;” | “/” | “?” | “:” | “@” | “&” | “=” | “+” | “$” | “,”
+      //                         | “_” | “.” | “!” | “~” | “*” | “'” | “(” | “)” | “[” | “]”
+      //
+      // Also need to encode '!' because it has special meaning (end of tag prefix).
+      //
+      tagStr = encodeURI(
+        state.tag[0] === '!' ? state.tag.slice(1) : state.tag
+      ).replace(/!/g, '%21');
+
+      if (state.tag[0] === '!') {
+        tagStr = '!' + tagStr;
+      } else if (tagStr.slice(0, 18) === 'tag:yaml.org,2002:') {
+        tagStr = '!!' + tagStr.slice(18);
+      } else {
+        tagStr = '!<' + tagStr + '>';
+      }
+
+      state.dump = tagStr + ' ' + state.dump;
+    }
+  }
+
+  return true;
+}
+
+function getDuplicateReferences(object, state) {
+  var objects = [],
+      duplicatesIndexes = [],
+      index,
+      length;
+
+  inspectNode(object, objects, duplicatesIndexes);
+
+  for (index = 0, length = duplicatesIndexes.length; index < length; index += 1) {
+    state.duplicates.push(objects[duplicatesIndexes[index]]);
+  }
+  state.usedDuplicates = new Array(length);
+}
+
+function inspectNode(object, objects, duplicatesIndexes) {
+  var objectKeyList,
+      index,
+      length;
+
+  if (object !== null && typeof object === 'object') {
+    index = objects.indexOf(object);
+    if (index !== -1) {
+      if (duplicatesIndexes.indexOf(index) === -1) {
+        duplicatesIndexes.push(index);
+      }
+    } else {
+      objects.push(object);
+
+      if (Array.isArray(object)) {
+        for (index = 0, length = object.length; index < length; index += 1) {
+          inspectNode(object[index], objects, duplicatesIndexes);
+        }
+      } else {
+        objectKeyList = Object.keys(object);
+
+        for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+          inspectNode(object[objectKeyList[index]], objects, duplicatesIndexes);
+        }
+      }
+    }
+  }
+}
+
+function dump$1(input, options) {
+  options = options || {};
+
+  var state = new State(options);
+
+  if (!state.noRefs) getDuplicateReferences(input, state);
+
+  var value = input;
+
+  if (state.replacer) {
+    value = state.replacer.call({ '': value }, '', value);
+  }
+
+  if (writeNode(state, 0, value, true, true)) return state.dump + '\n';
+
+  return '';
+}
+
+var dump_1 = dump$1;
+
+var dumper = {
+	dump: dump_1
+};
+
+function renamed(from, to) {
+  return function () {
+    throw new Error('Function yaml.' + from + ' is removed in js-yaml 4. ' +
+      'Use yaml.' + to + ' instead, which is now safe by default.');
+  };
+}
+
+
+var Type                = type;
+var Schema              = schema;
+var FAILSAFE_SCHEMA     = failsafe;
+var JSON_SCHEMA         = json;
+var CORE_SCHEMA         = core;
+var DEFAULT_SCHEMA      = _default;
+var load                = loader.load;
+var loadAll             = loader.loadAll;
+var dump                = dumper.dump;
+var YAMLException       = exception;
+
+// Re-export all types in case user wants to create custom schema
+var types = {
+  binary:    binary,
+  float:     float,
+  map:       map,
+  null:      _null,
+  pairs:     pairs,
+  set:       set,
+  timestamp: timestamp,
+  bool:      bool,
+  int:       int,
+  merge:     merge,
+  omap:      omap,
+  seq:       seq,
+  str:       str
+};
+
+// Removed functions from JS-YAML 3.0.x
+var safeLoad            = renamed('safeLoad', 'load');
+var safeLoadAll         = renamed('safeLoadAll', 'loadAll');
+var safeDump            = renamed('safeDump', 'dump');
+
+var jsYaml = {
+	Type: Type,
+	Schema: Schema,
+	FAILSAFE_SCHEMA: FAILSAFE_SCHEMA,
+	JSON_SCHEMA: JSON_SCHEMA,
+	CORE_SCHEMA: CORE_SCHEMA,
+	DEFAULT_SCHEMA: DEFAULT_SCHEMA,
+	load: load,
+	loadAll: loadAll,
+	dump: dump,
+	YAMLException: YAMLException,
+	types: types,
+	safeLoad: safeLoad,
+	safeLoadAll: safeLoadAll,
+	safeDump: safeDump
+};
+
+export default jsYaml;
+export { CORE_SCHEMA, DEFAULT_SCHEMA, FAILSAFE_SCHEMA, JSON_SCHEMA, Schema, Type, YAMLException, dump, load, loadAll, safeDump, safeLoad, safeLoadAll, types };
diff --git a/node_modules/js-yaml/index.js b/node_modules/js-yaml/index.js
new file mode 100644
index 0000000..bcb7eba
--- /dev/null
+++ b/node_modules/js-yaml/index.js
@@ -0,0 +1,47 @@
+'use strict';
+
+
+var loader = require('./lib/loader');
+var dumper = require('./lib/dumper');
+
+
+function renamed(from, to) {
+  return function () {
+    throw new Error('Function yaml.' + from + ' is removed in js-yaml 4. ' +
+      'Use yaml.' + to + ' instead, which is now safe by default.');
+  };
+}
+
+
+module.exports.Type                = require('./lib/type');
+module.exports.Schema              = require('./lib/schema');
+module.exports.FAILSAFE_SCHEMA     = require('./lib/schema/failsafe');
+module.exports.JSON_SCHEMA         = require('./lib/schema/json');
+module.exports.CORE_SCHEMA         = require('./lib/schema/core');
+module.exports.DEFAULT_SCHEMA      = require('./lib/schema/default');
+module.exports.load                = loader.load;
+module.exports.loadAll             = loader.loadAll;
+module.exports.dump                = dumper.dump;
+module.exports.YAMLException       = require('./lib/exception');
+
+// Re-export all types in case user wants to create custom schema
+module.exports.types = {
+  binary:    require('./lib/type/binary'),
+  float:     require('./lib/type/float'),
+  map:       require('./lib/type/map'),
+  null:      require('./lib/type/null'),
+  pairs:     require('./lib/type/pairs'),
+  set:       require('./lib/type/set'),
+  timestamp: require('./lib/type/timestamp'),
+  bool:      require('./lib/type/bool'),
+  int:       require('./lib/type/int'),
+  merge:     require('./lib/type/merge'),
+  omap:      require('./lib/type/omap'),
+  seq:       require('./lib/type/seq'),
+  str:       require('./lib/type/str')
+};
+
+// Removed functions from JS-YAML 3.0.x
+module.exports.safeLoad            = renamed('safeLoad', 'load');
+module.exports.safeLoadAll         = renamed('safeLoadAll', 'loadAll');
+module.exports.safeDump            = renamed('safeDump', 'dump');
diff --git a/node_modules/js-yaml/lib/common.js b/node_modules/js-yaml/lib/common.js
new file mode 100644
index 0000000..25ef7d8
--- /dev/null
+++ b/node_modules/js-yaml/lib/common.js
@@ -0,0 +1,59 @@
+'use strict';
+
+
+function isNothing(subject) {
+  return (typeof subject === 'undefined') || (subject === null);
+}
+
+
+function isObject(subject) {
+  return (typeof subject === 'object') && (subject !== null);
+}
+
+
+function toArray(sequence) {
+  if (Array.isArray(sequence)) return sequence;
+  else if (isNothing(sequence)) return [];
+
+  return [ sequence ];
+}
+
+
+function extend(target, source) {
+  var index, length, key, sourceKeys;
+
+  if (source) {
+    sourceKeys = Object.keys(source);
+
+    for (index = 0, length = sourceKeys.length; index < length; index += 1) {
+      key = sourceKeys[index];
+      target[key] = source[key];
+    }
+  }
+
+  return target;
+}
+
+
+function repeat(string, count) {
+  var result = '', cycle;
+
+  for (cycle = 0; cycle < count; cycle += 1) {
+    result += string;
+  }
+
+  return result;
+}
+
+
+function isNegativeZero(number) {
+  return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
+}
+
+
+module.exports.isNothing      = isNothing;
+module.exports.isObject       = isObject;
+module.exports.toArray        = toArray;
+module.exports.repeat         = repeat;
+module.exports.isNegativeZero = isNegativeZero;
+module.exports.extend         = extend;
diff --git a/node_modules/js-yaml/lib/dumper.js b/node_modules/js-yaml/lib/dumper.js
new file mode 100644
index 0000000..f357a6a
--- /dev/null
+++ b/node_modules/js-yaml/lib/dumper.js
@@ -0,0 +1,965 @@
+'use strict';
+
+/*eslint-disable no-use-before-define*/
+
+var common              = require('./common');
+var YAMLException       = require('./exception');
+var DEFAULT_SCHEMA      = require('./schema/default');
+
+var _toString       = Object.prototype.toString;
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+var CHAR_BOM                  = 0xFEFF;
+var CHAR_TAB                  = 0x09; /* Tab */
+var CHAR_LINE_FEED            = 0x0A; /* LF */
+var CHAR_CARRIAGE_RETURN      = 0x0D; /* CR */
+var CHAR_SPACE                = 0x20; /* Space */
+var CHAR_EXCLAMATION          = 0x21; /* ! */
+var CHAR_DOUBLE_QUOTE         = 0x22; /* " */
+var CHAR_SHARP                = 0x23; /* # */
+var CHAR_PERCENT              = 0x25; /* % */
+var CHAR_AMPERSAND            = 0x26; /* & */
+var CHAR_SINGLE_QUOTE         = 0x27; /* ' */
+var CHAR_ASTERISK             = 0x2A; /* * */
+var CHAR_COMMA                = 0x2C; /* , */
+var CHAR_MINUS                = 0x2D; /* - */
+var CHAR_COLON                = 0x3A; /* : */
+var CHAR_EQUALS               = 0x3D; /* = */
+var CHAR_GREATER_THAN         = 0x3E; /* > */
+var CHAR_QUESTION             = 0x3F; /* ? */
+var CHAR_COMMERCIAL_AT        = 0x40; /* @ */
+var CHAR_LEFT_SQUARE_BRACKET  = 0x5B; /* [ */
+var CHAR_RIGHT_SQUARE_BRACKET = 0x5D; /* ] */
+var CHAR_GRAVE_ACCENT         = 0x60; /* ` */
+var CHAR_LEFT_CURLY_BRACKET   = 0x7B; /* { */
+var CHAR_VERTICAL_LINE        = 0x7C; /* | */
+var CHAR_RIGHT_CURLY_BRACKET  = 0x7D; /* } */
+
+var ESCAPE_SEQUENCES = {};
+
+ESCAPE_SEQUENCES[0x00]   = '\\0';
+ESCAPE_SEQUENCES[0x07]   = '\\a';
+ESCAPE_SEQUENCES[0x08]   = '\\b';
+ESCAPE_SEQUENCES[0x09]   = '\\t';
+ESCAPE_SEQUENCES[0x0A]   = '\\n';
+ESCAPE_SEQUENCES[0x0B]   = '\\v';
+ESCAPE_SEQUENCES[0x0C]   = '\\f';
+ESCAPE_SEQUENCES[0x0D]   = '\\r';
+ESCAPE_SEQUENCES[0x1B]   = '\\e';
+ESCAPE_SEQUENCES[0x22]   = '\\"';
+ESCAPE_SEQUENCES[0x5C]   = '\\\\';
+ESCAPE_SEQUENCES[0x85]   = '\\N';
+ESCAPE_SEQUENCES[0xA0]   = '\\_';
+ESCAPE_SEQUENCES[0x2028] = '\\L';
+ESCAPE_SEQUENCES[0x2029] = '\\P';
+
+var DEPRECATED_BOOLEANS_SYNTAX = [
+  'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
+  'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
+];
+
+var DEPRECATED_BASE60_SYNTAX = /^[-+]?[0-9_]+(?::[0-9_]+)+(?:\.[0-9_]*)?$/;
+
+function compileStyleMap(schema, map) {
+  var result, keys, index, length, tag, style, type;
+
+  if (map === null) return {};
+
+  result = {};
+  keys = Object.keys(map);
+
+  for (index = 0, length = keys.length; index < length; index += 1) {
+    tag = keys[index];
+    style = String(map[tag]);
+
+    if (tag.slice(0, 2) === '!!') {
+      tag = 'tag:yaml.org,2002:' + tag.slice(2);
+    }
+    type = schema.compiledTypeMap['fallback'][tag];
+
+    if (type && _hasOwnProperty.call(type.styleAliases, style)) {
+      style = type.styleAliases[style];
+    }
+
+    result[tag] = style;
+  }
+
+  return result;
+}
+
+function encodeHex(character) {
+  var string, handle, length;
+
+  string = character.toString(16).toUpperCase();
+
+  if (character <= 0xFF) {
+    handle = 'x';
+    length = 2;
+  } else if (character <= 0xFFFF) {
+    handle = 'u';
+    length = 4;
+  } else if (character <= 0xFFFFFFFF) {
+    handle = 'U';
+    length = 8;
+  } else {
+    throw new YAMLException('code point within a string may not be greater than 0xFFFFFFFF');
+  }
+
+  return '\\' + handle + common.repeat('0', length - string.length) + string;
+}
+
+
+var QUOTING_TYPE_SINGLE = 1,
+    QUOTING_TYPE_DOUBLE = 2;
+
+function State(options) {
+  this.schema        = options['schema'] || DEFAULT_SCHEMA;
+  this.indent        = Math.max(1, (options['indent'] || 2));
+  this.noArrayIndent = options['noArrayIndent'] || false;
+  this.skipInvalid   = options['skipInvalid'] || false;
+  this.flowLevel     = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+  this.styleMap      = compileStyleMap(this.schema, options['styles'] || null);
+  this.sortKeys      = options['sortKeys'] || false;
+  this.lineWidth     = options['lineWidth'] || 80;
+  this.noRefs        = options['noRefs'] || false;
+  this.noCompatMode  = options['noCompatMode'] || false;
+  this.condenseFlow  = options['condenseFlow'] || false;
+  this.quotingType   = options['quotingType'] === '"' ? QUOTING_TYPE_DOUBLE : QUOTING_TYPE_SINGLE;
+  this.forceQuotes   = options['forceQuotes'] || false;
+  this.replacer      = typeof options['replacer'] === 'function' ? options['replacer'] : null;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.explicitTypes = this.schema.compiledExplicit;
+
+  this.tag = null;
+  this.result = '';
+
+  this.duplicates = [];
+  this.usedDuplicates = null;
+}
+
+// Indents every line in a string. Empty lines (\n only) are not indented.
+function indentString(string, spaces) {
+  var ind = common.repeat(' ', spaces),
+      position = 0,
+      next = -1,
+      result = '',
+      line,
+      length = string.length;
+
+  while (position < length) {
+    next = string.indexOf('\n', position);
+    if (next === -1) {
+      line = string.slice(position);
+      position = length;
+    } else {
+      line = string.slice(position, next + 1);
+      position = next + 1;
+    }
+
+    if (line.length && line !== '\n') result += ind;
+
+    result += line;
+  }
+
+  return result;
+}
+
+function generateNextLine(state, level) {
+  return '\n' + common.repeat(' ', state.indent * level);
+}
+
+function testImplicitResolving(state, str) {
+  var index, length, type;
+
+  for (index = 0, length = state.implicitTypes.length; index < length; index += 1) {
+    type = state.implicitTypes[index];
+
+    if (type.resolve(str)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// [33] s-white ::= s-space | s-tab
+function isWhitespace(c) {
+  return c === CHAR_SPACE || c === CHAR_TAB;
+}
+
+// Returns true if the character can be printed without escaping.
+// From YAML 1.2: "any allowed characters known to be non-printable
+// should also be escaped. [However,] This isn’t mandatory"
+// Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
+function isPrintable(c) {
+  return  (0x00020 <= c && c <= 0x00007E)
+      || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
+      || ((0x0E000 <= c && c <= 0x00FFFD) && c !== CHAR_BOM)
+      ||  (0x10000 <= c && c <= 0x10FFFF);
+}
+
+// [34] ns-char ::= nb-char - s-white
+// [27] nb-char ::= c-printable - b-char - c-byte-order-mark
+// [26] b-char  ::= b-line-feed | b-carriage-return
+// Including s-white (for some reason, examples doesn't match specs in this aspect)
+// ns-char ::= c-printable - b-line-feed - b-carriage-return - c-byte-order-mark
+function isNsCharOrWhitespace(c) {
+  return isPrintable(c)
+    && c !== CHAR_BOM
+    // - b-char
+    && c !== CHAR_CARRIAGE_RETURN
+    && c !== CHAR_LINE_FEED;
+}
+
+// [127]  ns-plain-safe(c) ::= c = flow-out  ⇒ ns-plain-safe-out
+//                             c = flow-in   ⇒ ns-plain-safe-in
+//                             c = block-key ⇒ ns-plain-safe-out
+//                             c = flow-key  ⇒ ns-plain-safe-in
+// [128] ns-plain-safe-out ::= ns-char
+// [129]  ns-plain-safe-in ::= ns-char - c-flow-indicator
+// [130]  ns-plain-char(c) ::=  ( ns-plain-safe(c) - “:” - “#” )
+//                            | ( /* An ns-char preceding */ “#” )
+//                            | ( “:” /* Followed by an ns-plain-safe(c) */ )
+function isPlainSafe(c, prev, inblock) {
+  var cIsNsCharOrWhitespace = isNsCharOrWhitespace(c);
+  var cIsNsChar = cIsNsCharOrWhitespace && !isWhitespace(c);
+  return (
+    // ns-plain-safe
+    inblock ? // c = flow-in
+      cIsNsCharOrWhitespace
+      : cIsNsCharOrWhitespace
+        // - c-flow-indicator
+        && c !== CHAR_COMMA
+        && c !== CHAR_LEFT_SQUARE_BRACKET
+        && c !== CHAR_RIGHT_SQUARE_BRACKET
+        && c !== CHAR_LEFT_CURLY_BRACKET
+        && c !== CHAR_RIGHT_CURLY_BRACKET
+  )
+    // ns-plain-char
+    && c !== CHAR_SHARP // false on '#'
+    && !(prev === CHAR_COLON && !cIsNsChar) // false on ': '
+    || (isNsCharOrWhitespace(prev) && !isWhitespace(prev) && c === CHAR_SHARP) // change to true on '[^ ]#'
+    || (prev === CHAR_COLON && cIsNsChar); // change to true on ':[^ ]'
+}
+
+// Simplified test for values allowed as the first character in plain style.
+function isPlainSafeFirst(c) {
+  // Uses a subset of ns-char - c-indicator
+  // where ns-char = nb-char - s-white.
+  // No support of ( ( “?” | “:” | “-” ) /* Followed by an ns-plain-safe(c)) */ ) part
+  return isPrintable(c) && c !== CHAR_BOM
+    && !isWhitespace(c) // - s-white
+    // - (c-indicator ::=
+    // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
+    && c !== CHAR_MINUS
+    && c !== CHAR_QUESTION
+    && c !== CHAR_COLON
+    && c !== CHAR_COMMA
+    && c !== CHAR_LEFT_SQUARE_BRACKET
+    && c !== CHAR_RIGHT_SQUARE_BRACKET
+    && c !== CHAR_LEFT_CURLY_BRACKET
+    && c !== CHAR_RIGHT_CURLY_BRACKET
+    // | “#” | “&” | “*” | “!” | “|” | “=” | “>” | “'” | “"”
+    && c !== CHAR_SHARP
+    && c !== CHAR_AMPERSAND
+    && c !== CHAR_ASTERISK
+    && c !== CHAR_EXCLAMATION
+    && c !== CHAR_VERTICAL_LINE
+    && c !== CHAR_EQUALS
+    && c !== CHAR_GREATER_THAN
+    && c !== CHAR_SINGLE_QUOTE
+    && c !== CHAR_DOUBLE_QUOTE
+    // | “%” | “@” | “`”)
+    && c !== CHAR_PERCENT
+    && c !== CHAR_COMMERCIAL_AT
+    && c !== CHAR_GRAVE_ACCENT;
+}
+
+// Simplified test for values allowed as the last character in plain style.
+function isPlainSafeLast(c) {
+  // just not whitespace or colon, it will be checked to be plain character later
+  return !isWhitespace(c) && c !== CHAR_COLON;
+}
+
+// Same as 'string'.codePointAt(pos), but works in older browsers.
+function codePointAt(string, pos) {
+  var first = string.charCodeAt(pos), second;
+  if (first >= 0xD800 && first <= 0xDBFF && pos + 1 < string.length) {
+    second = string.charCodeAt(pos + 1);
+    if (second >= 0xDC00 && second <= 0xDFFF) {
+      // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+      return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+    }
+  }
+  return first;
+}
+
+// Determines whether block indentation indicator is required.
+function needIndentIndicator(string) {
+  var leadingSpaceRe = /^\n* /;
+  return leadingSpaceRe.test(string);
+}
+
+var STYLE_PLAIN   = 1,
+    STYLE_SINGLE  = 2,
+    STYLE_LITERAL = 3,
+    STYLE_FOLDED  = 4,
+    STYLE_DOUBLE  = 5;
+
+// Determines which scalar styles are possible and returns the preferred style.
+// lineWidth = -1 => no limit.
+// Pre-conditions: str.length > 0.
+// Post-conditions:
+//    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
+//    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
+//    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
+function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth,
+  testAmbiguousType, quotingType, forceQuotes, inblock) {
+
+  var i;
+  var char = 0;
+  var prevChar = null;
+  var hasLineBreak = false;
+  var hasFoldableLine = false; // only checked if shouldTrackWidth
+  var shouldTrackWidth = lineWidth !== -1;
+  var previousLineBreak = -1; // count the first line correctly
+  var plain = isPlainSafeFirst(codePointAt(string, 0))
+          && isPlainSafeLast(codePointAt(string, string.length - 1));
+
+  if (singleLineOnly || forceQuotes) {
+    // Case: no block styles.
+    // Check for disallowed characters to rule out plain and single.
+    for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+      char = codePointAt(string, i);
+      if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char, prevChar, inblock);
+      prevChar = char;
+    }
+  } else {
+    // Case: block styles permitted.
+    for (i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+      char = codePointAt(string, i);
+      if (char === CHAR_LINE_FEED) {
+        hasLineBreak = true;
+        // Check if any line can be folded.
+        if (shouldTrackWidth) {
+          hasFoldableLine = hasFoldableLine ||
+            // Foldable line = too long, and not more-indented.
+            (i - previousLineBreak - 1 > lineWidth &&
+             string[previousLineBreak + 1] !== ' ');
+          previousLineBreak = i;
+        }
+      } else if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char, prevChar, inblock);
+      prevChar = char;
+    }
+    // in case the end is missing a \n
+    hasFoldableLine = hasFoldableLine || (shouldTrackWidth &&
+      (i - previousLineBreak - 1 > lineWidth &&
+       string[previousLineBreak + 1] !== ' '));
+  }
+  // Although every style can represent \n without escaping, prefer block styles
+  // for multiline, since they're more readable and they don't add empty lines.
+  // Also prefer folding a super-long line.
+  if (!hasLineBreak && !hasFoldableLine) {
+    // Strings interpretable as another type have to be quoted;
+    // e.g. the string 'true' vs. the boolean true.
+    if (plain && !forceQuotes && !testAmbiguousType(string)) {
+      return STYLE_PLAIN;
+    }
+    return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
+  }
+  // Edge case: block indentation indicator can only have one digit.
+  if (indentPerLevel > 9 && needIndentIndicator(string)) {
+    return STYLE_DOUBLE;
+  }
+  // At this point we know block styles are valid.
+  // Prefer literal style unless we want to fold.
+  if (!forceQuotes) {
+    return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+  }
+  return quotingType === QUOTING_TYPE_DOUBLE ? STYLE_DOUBLE : STYLE_SINGLE;
+}
+
+// Note: line breaking/folding is implemented for only the folded style.
+// NB. We drop the last trailing newline (if any) of a returned block scalar
+//  since the dumper adds its own newline. This always works:
+//    • No ending newline => unaffected; already using strip "-" chomping.
+//    • Ending newline    => removed then restored.
+//  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
+function writeScalar(state, string, level, iskey, inblock) {
+  state.dump = (function () {
+    if (string.length === 0) {
+      return state.quotingType === QUOTING_TYPE_DOUBLE ? '""' : "''";
+    }
+    if (!state.noCompatMode) {
+      if (DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1 || DEPRECATED_BASE60_SYNTAX.test(string)) {
+        return state.quotingType === QUOTING_TYPE_DOUBLE ? ('"' + string + '"') : ("'" + string + "'");
+      }
+    }
+
+    var indent = state.indent * Math.max(1, level); // no 0-indent scalars
+    // As indentation gets deeper, let the width decrease monotonically
+    // to the lower bound min(state.lineWidth, 40).
+    // Note that this implies
+    //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
+    //  state.lineWidth > 40 + state.indent: width decreases until the lower bound.
+    // This behaves better than a constant minimum width which disallows narrower options,
+    // or an indent threshold which causes the width to suddenly increase.
+    var lineWidth = state.lineWidth === -1
+      ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
+
+    // Without knowing if keys are implicit/explicit, assume implicit for safety.
+    var singleLineOnly = iskey
+      // No block styles in flow mode.
+      || (state.flowLevel > -1 && level >= state.flowLevel);
+    function testAmbiguity(string) {
+      return testImplicitResolving(state, string);
+    }
+
+    switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth,
+      testAmbiguity, state.quotingType, state.forceQuotes && !iskey, inblock)) {
+
+      case STYLE_PLAIN:
+        return string;
+      case STYLE_SINGLE:
+        return "'" + string.replace(/'/g, "''") + "'";
+      case STYLE_LITERAL:
+        return '|' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(string, indent));
+      case STYLE_FOLDED:
+        return '>' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(foldString(string, lineWidth), indent));
+      case STYLE_DOUBLE:
+        return '"' + escapeString(string, lineWidth) + '"';
+      default:
+        throw new YAMLException('impossible error: invalid scalar style');
+    }
+  }());
+}
+
+// Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
+function blockHeader(string, indentPerLevel) {
+  var indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : '';
+
+  // note the special case: the string '\n' counts as a "trailing" empty line.
+  var clip =          string[string.length - 1] === '\n';
+  var keep = clip && (string[string.length - 2] === '\n' || string === '\n');
+  var chomp = keep ? '+' : (clip ? '' : '-');
+
+  return indentIndicator + chomp + '\n';
+}
+
+// (See the note for writeScalar.)
+function dropEndingNewline(string) {
+  return string[string.length - 1] === '\n' ? string.slice(0, -1) : string;
+}
+
+// Note: a long line without a suitable break point will exceed the width limit.
+// Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
+function foldString(string, width) {
+  // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
+  // unless they're before or after a more-indented line, or at the very
+  // beginning or end, in which case $k$ maps to $k$.
+  // Therefore, parse each chunk as newline(s) followed by a content line.
+  var lineRe = /(\n+)([^\n]*)/g;
+
+  // first line (possibly an empty line)
+  var result = (function () {
+    var nextLF = string.indexOf('\n');
+    nextLF = nextLF !== -1 ? nextLF : string.length;
+    lineRe.lastIndex = nextLF;
+    return foldLine(string.slice(0, nextLF), width);
+  }());
+  // If we haven't reached the first content line yet, don't add an extra \n.
+  var prevMoreIndented = string[0] === '\n' || string[0] === ' ';
+  var moreIndented;
+
+  // rest of the lines
+  var match;
+  while ((match = lineRe.exec(string))) {
+    var prefix = match[1], line = match[2];
+    moreIndented = (line[0] === ' ');
+    result += prefix
+      + (!prevMoreIndented && !moreIndented && line !== ''
+        ? '\n' : '')
+      + foldLine(line, width);
+    prevMoreIndented = moreIndented;
+  }
+
+  return result;
+}
+
+// Greedy line breaking.
+// Picks the longest line under the limit each time,
+// otherwise settles for the shortest line over the limit.
+// NB. More-indented lines *cannot* be folded, as that would add an extra \n.
+function foldLine(line, width) {
+  if (line === '' || line[0] === ' ') return line;
+
+  // Since a more-indented line adds a \n, breaks can't be followed by a space.
+  var breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
+  var match;
+  // start is an inclusive index. end, curr, and next are exclusive.
+  var start = 0, end, curr = 0, next = 0;
+  var result = '';
+
+  // Invariants: 0 <= start <= length-1.
+  //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
+  // Inside the loop:
+  //   A match implies length >= 2, so curr and next are <= length-2.
+  while ((match = breakRe.exec(line))) {
+    next = match.index;
+    // maintain invariant: curr - start <= width
+    if (next - start > width) {
+      end = (curr > start) ? curr : next; // derive end <= length-2
+      result += '\n' + line.slice(start, end);
+      // skip the space that was output as \n
+      start = end + 1;                    // derive start <= length-1
+    }
+    curr = next;
+  }
+
+  // By the invariants, start <= length-1, so there is something left over.
+  // It is either the whole string or a part starting from non-whitespace.
+  result += '\n';
+  // Insert a break if the remainder is too long and there is a break available.
+  if (line.length - start > width && curr > start) {
+    result += line.slice(start, curr) + '\n' + line.slice(curr + 1);
+  } else {
+    result += line.slice(start);
+  }
+
+  return result.slice(1); // drop extra \n joiner
+}
+
+// Escapes a double-quoted string.
+function escapeString(string) {
+  var result = '';
+  var char = 0;
+  var escapeSeq;
+
+  for (var i = 0; i < string.length; char >= 0x10000 ? i += 2 : i++) {
+    char = codePointAt(string, i);
+    escapeSeq = ESCAPE_SEQUENCES[char];
+
+    if (!escapeSeq && isPrintable(char)) {
+      result += string[i];
+      if (char >= 0x10000) result += string[i + 1];
+    } else {
+      result += escapeSeq || encodeHex(char);
+    }
+  }
+
+  return result;
+}
+
+function writeFlowSequence(state, level, object) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length,
+      value;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    value = object[index];
+
+    if (state.replacer) {
+      value = state.replacer.call(object, String(index), value);
+    }
+
+    // Write only valid elements, put null instead of invalid elements.
+    if (writeNode(state, level, value, false, false) ||
+        (typeof value === 'undefined' &&
+         writeNode(state, level, null, false, false))) {
+
+      if (_result !== '') _result += ',' + (!state.condenseFlow ? ' ' : '');
+      _result += state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = '[' + _result + ']';
+}
+
+function writeBlockSequence(state, level, object, compact) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length,
+      value;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    value = object[index];
+
+    if (state.replacer) {
+      value = state.replacer.call(object, String(index), value);
+    }
+
+    // Write only valid elements, put null instead of invalid elements.
+    if (writeNode(state, level + 1, value, true, true, false, true) ||
+        (typeof value === 'undefined' &&
+         writeNode(state, level + 1, null, true, true, false, true))) {
+
+      if (!compact || _result !== '') {
+        _result += generateNextLine(state, level);
+      }
+
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        _result += '-';
+      } else {
+        _result += '- ';
+      }
+
+      _result += state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '[]'; // Empty sequence if no valid values.
+}
+
+function writeFlowMapping(state, level, object) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      pairBuffer;
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+
+    pairBuffer = '';
+    if (_result !== '') pairBuffer += ', ';
+
+    if (state.condenseFlow) pairBuffer += '"';
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (state.replacer) {
+      objectValue = state.replacer.call(object, objectKey, objectValue);
+    }
+
+    if (!writeNode(state, level, objectKey, false, false)) {
+      continue; // Skip this pair because of invalid key;
+    }
+
+    if (state.dump.length > 1024) pairBuffer += '? ';
+
+    pairBuffer += state.dump + (state.condenseFlow ? '"' : '') + ':' + (state.condenseFlow ? '' : ' ');
+
+    if (!writeNode(state, level, objectValue, false, false)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = '{' + _result + '}';
+}
+
+function writeBlockMapping(state, level, object, compact) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      explicitPair,
+      pairBuffer;
+
+  // Allow sorting keys so that the output file is deterministic
+  if (state.sortKeys === true) {
+    // Default sorting
+    objectKeyList.sort();
+  } else if (typeof state.sortKeys === 'function') {
+    // Custom sort function
+    objectKeyList.sort(state.sortKeys);
+  } else if (state.sortKeys) {
+    // Something is wrong
+    throw new YAMLException('sortKeys must be a boolean or a function');
+  }
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+    pairBuffer = '';
+
+    if (!compact || _result !== '') {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (state.replacer) {
+      objectValue = state.replacer.call(object, objectKey, objectValue);
+    }
+
+    if (!writeNode(state, level + 1, objectKey, true, true, true)) {
+      continue; // Skip this pair because of invalid key.
+    }
+
+    explicitPair = (state.tag !== null && state.tag !== '?') ||
+                   (state.dump && state.dump.length > 1024);
+
+    if (explicitPair) {
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        pairBuffer += '?';
+      } else {
+        pairBuffer += '? ';
+      }
+    }
+
+    pairBuffer += state.dump;
+
+    if (explicitPair) {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+      pairBuffer += ':';
+    } else {
+      pairBuffer += ': ';
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '{}'; // Empty mapping if no valid pairs.
+}
+
+function detectType(state, object, explicit) {
+  var _result, typeList, index, length, type, style;
+
+  typeList = explicit ? state.explicitTypes : state.implicitTypes;
+
+  for (index = 0, length = typeList.length; index < length; index += 1) {
+    type = typeList[index];
+
+    if ((type.instanceOf  || type.predicate) &&
+        (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
+        (!type.predicate  || type.predicate(object))) {
+
+      if (explicit) {
+        if (type.multi && type.representName) {
+          state.tag = type.representName(object);
+        } else {
+          state.tag = type.tag;
+        }
+      } else {
+        state.tag = '?';
+      }
+
+      if (type.represent) {
+        style = state.styleMap[type.tag] || type.defaultStyle;
+
+        if (_toString.call(type.represent) === '[object Function]') {
+          _result = type.represent(object, style);
+        } else if (_hasOwnProperty.call(type.represent, style)) {
+          _result = type.represent[style](object, style);
+        } else {
+          throw new YAMLException('!<' + type.tag + '> tag resolver accepts not "' + style + '" style');
+        }
+
+        state.dump = _result;
+      }
+
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// Serializes `object` and writes it to global `result`.
+// Returns true on success, or false on invalid object.
+//
+function writeNode(state, level, object, block, compact, iskey, isblockseq) {
+  state.tag = null;
+  state.dump = object;
+
+  if (!detectType(state, object, false)) {
+    detectType(state, object, true);
+  }
+
+  var type = _toString.call(state.dump);
+  var inblock = block;
+  var tagStr;
+
+  if (block) {
+    block = (state.flowLevel < 0 || state.flowLevel > level);
+  }
+
+  var objectOrArray = type === '[object Object]' || type === '[object Array]',
+      duplicateIndex,
+      duplicate;
+
+  if (objectOrArray) {
+    duplicateIndex = state.duplicates.indexOf(object);
+    duplicate = duplicateIndex !== -1;
+  }
+
+  if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
+    compact = false;
+  }
+
+  if (duplicate && state.usedDuplicates[duplicateIndex]) {
+    state.dump = '*ref_' + duplicateIndex;
+  } else {
+    if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
+      state.usedDuplicates[duplicateIndex] = true;
+    }
+    if (type === '[object Object]') {
+      if (block && (Object.keys(state.dump).length !== 0)) {
+        writeBlockMapping(state, level, state.dump, compact);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowMapping(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object Array]') {
+      if (block && (state.dump.length !== 0)) {
+        if (state.noArrayIndent && !isblockseq && level > 0) {
+          writeBlockSequence(state, level - 1, state.dump, compact);
+        } else {
+          writeBlockSequence(state, level, state.dump, compact);
+        }
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowSequence(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object String]') {
+      if (state.tag !== '?') {
+        writeScalar(state, state.dump, level, iskey, inblock);
+      }
+    } else if (type === '[object Undefined]') {
+      return false;
+    } else {
+      if (state.skipInvalid) return false;
+      throw new YAMLException('unacceptable kind of an object to dump ' + type);
+    }
+
+    if (state.tag !== null && state.tag !== '?') {
+      // Need to encode all characters except those allowed by the spec:
+      //
+      // [35] ns-dec-digit    ::=  [#x30-#x39] /* 0-9 */
+      // [36] ns-hex-digit    ::=  ns-dec-digit
+      //                         | [#x41-#x46] /* A-F */ | [#x61-#x66] /* a-f */
+      // [37] ns-ascii-letter ::=  [#x41-#x5A] /* A-Z */ | [#x61-#x7A] /* a-z */
+      // [38] ns-word-char    ::=  ns-dec-digit | ns-ascii-letter | “-”
+      // [39] ns-uri-char     ::=  “%” ns-hex-digit ns-hex-digit | ns-word-char | “#”
+      //                         | “;” | “/” | “?” | “:” | “@” | “&” | “=” | “+” | “$” | “,”
+      //                         | “_” | “.” | “!” | “~” | “*” | “'” | “(” | “)” | “[” | “]”
+      //
+      // Also need to encode '!' because it has special meaning (end of tag prefix).
+      //
+      tagStr = encodeURI(
+        state.tag[0] === '!' ? state.tag.slice(1) : state.tag
+      ).replace(/!/g, '%21');
+
+      if (state.tag[0] === '!') {
+        tagStr = '!' + tagStr;
+      } else if (tagStr.slice(0, 18) === 'tag:yaml.org,2002:') {
+        tagStr = '!!' + tagStr.slice(18);
+      } else {
+        tagStr = '!<' + tagStr + '>';
+      }
+
+      state.dump = tagStr + ' ' + state.dump;
+    }
+  }
+
+  return true;
+}
+
+function getDuplicateReferences(object, state) {
+  var objects = [],
+      duplicatesIndexes = [],
+      index,
+      length;
+
+  inspectNode(object, objects, duplicatesIndexes);
+
+  for (index = 0, length = duplicatesIndexes.length; index < length; index += 1) {
+    state.duplicates.push(objects[duplicatesIndexes[index]]);
+  }
+  state.usedDuplicates = new Array(length);
+}
+
+function inspectNode(object, objects, duplicatesIndexes) {
+  var objectKeyList,
+      index,
+      length;
+
+  if (object !== null && typeof object === 'object') {
+    index = objects.indexOf(object);
+    if (index !== -1) {
+      if (duplicatesIndexes.indexOf(index) === -1) {
+        duplicatesIndexes.push(index);
+      }
+    } else {
+      objects.push(object);
+
+      if (Array.isArray(object)) {
+        for (index = 0, length = object.length; index < length; index += 1) {
+          inspectNode(object[index], objects, duplicatesIndexes);
+        }
+      } else {
+        objectKeyList = Object.keys(object);
+
+        for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+          inspectNode(object[objectKeyList[index]], objects, duplicatesIndexes);
+        }
+      }
+    }
+  }
+}
+
+function dump(input, options) {
+  options = options || {};
+
+  var state = new State(options);
+
+  if (!state.noRefs) getDuplicateReferences(input, state);
+
+  var value = input;
+
+  if (state.replacer) {
+    value = state.replacer.call({ '': value }, '', value);
+  }
+
+  if (writeNode(state, 0, value, true, true)) return state.dump + '\n';
+
+  return '';
+}
+
+module.exports.dump = dump;
diff --git a/node_modules/js-yaml/lib/exception.js b/node_modules/js-yaml/lib/exception.js
new file mode 100644
index 0000000..7f62daa
--- /dev/null
+++ b/node_modules/js-yaml/lib/exception.js
@@ -0,0 +1,55 @@
+// YAML error class. http://stackoverflow.com/questions/8458984
+//
+'use strict';
+
+
+function formatError(exception, compact) {
+  var where = '', message = exception.reason || '(unknown reason)';
+
+  if (!exception.mark) return message;
+
+  if (exception.mark.name) {
+    where += 'in "' + exception.mark.name + '" ';
+  }
+
+  where += '(' + (exception.mark.line + 1) + ':' + (exception.mark.column + 1) + ')';
+
+  if (!compact && exception.mark.snippet) {
+    where += '\n\n' + exception.mark.snippet;
+  }
+
+  return message + ' ' + where;
+}
+
+
+function YAMLException(reason, mark) {
+  // Super constructor
+  Error.call(this);
+
+  this.name = 'YAMLException';
+  this.reason = reason;
+  this.mark = mark;
+  this.message = formatError(this, false);
+
+  // Include stack trace in error object
+  if (Error.captureStackTrace) {
+    // Chrome and NodeJS
+    Error.captureStackTrace(this, this.constructor);
+  } else {
+    // FF, IE 10+ and Safari 6+. Fallback for others
+    this.stack = (new Error()).stack || '';
+  }
+}
+
+
+// Inherit from Error
+YAMLException.prototype = Object.create(Error.prototype);
+YAMLException.prototype.constructor = YAMLException;
+
+
+YAMLException.prototype.toString = function toString(compact) {
+  return this.name + ': ' + formatError(this, compact);
+};
+
+
+module.exports = YAMLException;
diff --git a/node_modules/js-yaml/lib/loader.js b/node_modules/js-yaml/lib/loader.js
new file mode 100644
index 0000000..39f13f5
--- /dev/null
+++ b/node_modules/js-yaml/lib/loader.js
@@ -0,0 +1,1727 @@
+'use strict';
+
+/*eslint-disable max-len,no-use-before-define*/
+
+var common              = require('./common');
+var YAMLException       = require('./exception');
+var makeSnippet         = require('./snippet');
+var DEFAULT_SCHEMA      = require('./schema/default');
+
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+
+var CONTEXT_FLOW_IN   = 1;
+var CONTEXT_FLOW_OUT  = 2;
+var CONTEXT_BLOCK_IN  = 3;
+var CONTEXT_BLOCK_OUT = 4;
+
+
+var CHOMPING_CLIP  = 1;
+var CHOMPING_STRIP = 2;
+var CHOMPING_KEEP  = 3;
+
+
+var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
+var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
+var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
+var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
+var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
+
+
+function _class(obj) { return Object.prototype.toString.call(obj); }
+
+function is_EOL(c) {
+  return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
+}
+
+function is_WHITE_SPACE(c) {
+  return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
+}
+
+function is_WS_OR_EOL(c) {
+  return (c === 0x09/* Tab */) ||
+         (c === 0x20/* Space */) ||
+         (c === 0x0A/* LF */) ||
+         (c === 0x0D/* CR */);
+}
+
+function is_FLOW_INDICATOR(c) {
+  return c === 0x2C/* , */ ||
+         c === 0x5B/* [ */ ||
+         c === 0x5D/* ] */ ||
+         c === 0x7B/* { */ ||
+         c === 0x7D/* } */;
+}
+
+function fromHexCode(c) {
+  var lc;
+
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  /*eslint-disable no-bitwise*/
+  lc = c | 0x20;
+
+  if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
+    return lc - 0x61 + 10;
+  }
+
+  return -1;
+}
+
+function escapedHexLen(c) {
+  if (c === 0x78/* x */) { return 2; }
+  if (c === 0x75/* u */) { return 4; }
+  if (c === 0x55/* U */) { return 8; }
+  return 0;
+}
+
+function fromDecimalCode(c) {
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  return -1;
+}
+
+function simpleEscapeSequence(c) {
+  /* eslint-disable indent */
+  return (c === 0x30/* 0 */) ? '\x00' :
+        (c === 0x61/* a */) ? '\x07' :
+        (c === 0x62/* b */) ? '\x08' :
+        (c === 0x74/* t */) ? '\x09' :
+        (c === 0x09/* Tab */) ? '\x09' :
+        (c === 0x6E/* n */) ? '\x0A' :
+        (c === 0x76/* v */) ? '\x0B' :
+        (c === 0x66/* f */) ? '\x0C' :
+        (c === 0x72/* r */) ? '\x0D' :
+        (c === 0x65/* e */) ? '\x1B' :
+        (c === 0x20/* Space */) ? ' ' :
+        (c === 0x22/* " */) ? '\x22' :
+        (c === 0x2F/* / */) ? '/' :
+        (c === 0x5C/* \ */) ? '\x5C' :
+        (c === 0x4E/* N */) ? '\x85' :
+        (c === 0x5F/* _ */) ? '\xA0' :
+        (c === 0x4C/* L */) ? '\u2028' :
+        (c === 0x50/* P */) ? '\u2029' : '';
+}
+
+function charFromCodepoint(c) {
+  if (c <= 0xFFFF) {
+    return String.fromCharCode(c);
+  }
+  // Encode UTF-16 surrogate pair
+  // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
+  return String.fromCharCode(
+    ((c - 0x010000) >> 10) + 0xD800,
+    ((c - 0x010000) & 0x03FF) + 0xDC00
+  );
+}
+
+var simpleEscapeCheck = new Array(256); // integer, for fast access
+var simpleEscapeMap = new Array(256);
+for (var i = 0; i < 256; i++) {
+  simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
+  simpleEscapeMap[i] = simpleEscapeSequence(i);
+}
+
+
+function State(input, options) {
+  this.input = input;
+
+  this.filename  = options['filename']  || null;
+  this.schema    = options['schema']    || DEFAULT_SCHEMA;
+  this.onWarning = options['onWarning'] || null;
+  // (Hidden) Remove? makes the loader to expect YAML 1.1 documents
+  // if such documents have no explicit %YAML directive
+  this.legacy    = options['legacy']    || false;
+
+  this.json      = options['json']      || false;
+  this.listener  = options['listener']  || null;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.typeMap       = this.schema.compiledTypeMap;
+
+  this.length     = input.length;
+  this.position   = 0;
+  this.line       = 0;
+  this.lineStart  = 0;
+  this.lineIndent = 0;
+
+  // position of first leading tab in the current line,
+  // used to make sure there are no tabs in the indentation
+  this.firstTabInLine = -1;
+
+  this.documents = [];
+
+  /*
+  this.version;
+  this.checkLineBreaks;
+  this.tagMap;
+  this.anchorMap;
+  this.tag;
+  this.anchor;
+  this.kind;
+  this.result;*/
+
+}
+
+
+function generateError(state, message) {
+  var mark = {
+    name:     state.filename,
+    buffer:   state.input.slice(0, -1), // omit trailing \0
+    position: state.position,
+    line:     state.line,
+    column:   state.position - state.lineStart
+  };
+
+  mark.snippet = makeSnippet(mark);
+
+  return new YAMLException(message, mark);
+}
+
+function throwError(state, message) {
+  throw generateError(state, message);
+}
+
+function throwWarning(state, message) {
+  if (state.onWarning) {
+    state.onWarning.call(null, generateError(state, message));
+  }
+}
+
+
+var directiveHandlers = {
+
+  YAML: function handleYamlDirective(state, name, args) {
+
+    var match, major, minor;
+
+    if (state.version !== null) {
+      throwError(state, 'duplication of %YAML directive');
+    }
+
+    if (args.length !== 1) {
+      throwError(state, 'YAML directive accepts exactly one argument');
+    }
+
+    match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
+
+    if (match === null) {
+      throwError(state, 'ill-formed argument of the YAML directive');
+    }
+
+    major = parseInt(match[1], 10);
+    minor = parseInt(match[2], 10);
+
+    if (major !== 1) {
+      throwError(state, 'unacceptable YAML version of the document');
+    }
+
+    state.version = args[0];
+    state.checkLineBreaks = (minor < 2);
+
+    if (minor !== 1 && minor !== 2) {
+      throwWarning(state, 'unsupported YAML version of the document');
+    }
+  },
+
+  TAG: function handleTagDirective(state, name, args) {
+
+    var handle, prefix;
+
+    if (args.length !== 2) {
+      throwError(state, 'TAG directive accepts exactly two arguments');
+    }
+
+    handle = args[0];
+    prefix = args[1];
+
+    if (!PATTERN_TAG_HANDLE.test(handle)) {
+      throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
+    }
+
+    if (_hasOwnProperty.call(state.tagMap, handle)) {
+      throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
+    }
+
+    if (!PATTERN_TAG_URI.test(prefix)) {
+      throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
+    }
+
+    try {
+      prefix = decodeURIComponent(prefix);
+    } catch (err) {
+      throwError(state, 'tag prefix is malformed: ' + prefix);
+    }
+
+    state.tagMap[handle] = prefix;
+  }
+};
+
+
+function captureSegment(state, start, end, checkJson) {
+  var _position, _length, _character, _result;
+
+  if (start < end) {
+    _result = state.input.slice(start, end);
+
+    if (checkJson) {
+      for (_position = 0, _length = _result.length; _position < _length; _position += 1) {
+        _character = _result.charCodeAt(_position);
+        if (!(_character === 0x09 ||
+              (0x20 <= _character && _character <= 0x10FFFF))) {
+          throwError(state, 'expected valid JSON character');
+        }
+      }
+    } else if (PATTERN_NON_PRINTABLE.test(_result)) {
+      throwError(state, 'the stream contains non-printable characters');
+    }
+
+    state.result += _result;
+  }
+}
+
+function mergeMappings(state, destination, source, overridableKeys) {
+  var sourceKeys, key, index, quantity;
+
+  if (!common.isObject(source)) {
+    throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
+  }
+
+  sourceKeys = Object.keys(source);
+
+  for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
+    key = sourceKeys[index];
+
+    if (!_hasOwnProperty.call(destination, key)) {
+      destination[key] = source[key];
+      overridableKeys[key] = true;
+    }
+  }
+}
+
+function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode,
+  startLine, startLineStart, startPos) {
+
+  var index, quantity;
+
+  // The output is a plain object here, so keys can only be strings.
+  // We need to convert keyNode to a string, but doing so can hang the process
+  // (deeply nested arrays that explode exponentially using aliases).
+  if (Array.isArray(keyNode)) {
+    keyNode = Array.prototype.slice.call(keyNode);
+
+    for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
+      if (Array.isArray(keyNode[index])) {
+        throwError(state, 'nested arrays are not supported inside keys');
+      }
+
+      if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
+        keyNode[index] = '[object Object]';
+      }
+    }
+  }
+
+  // Avoid code execution in load() via toString property
+  // (still use its own toString for arrays, timestamps,
+  // and whatever user schema extensions happen to have @@toStringTag)
+  if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
+    keyNode = '[object Object]';
+  }
+
+
+  keyNode = String(keyNode);
+
+  if (_result === null) {
+    _result = {};
+  }
+
+  if (keyTag === 'tag:yaml.org,2002:merge') {
+    if (Array.isArray(valueNode)) {
+      for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
+        mergeMappings(state, _result, valueNode[index], overridableKeys);
+      }
+    } else {
+      mergeMappings(state, _result, valueNode, overridableKeys);
+    }
+  } else {
+    if (!state.json &&
+        !_hasOwnProperty.call(overridableKeys, keyNode) &&
+        _hasOwnProperty.call(_result, keyNode)) {
+      state.line = startLine || state.line;
+      state.lineStart = startLineStart || state.lineStart;
+      state.position = startPos || state.position;
+      throwError(state, 'duplicated mapping key');
+    }
+
+    // used for this specific key only because Object.defineProperty is slow
+    if (keyNode === '__proto__') {
+      Object.defineProperty(_result, keyNode, {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value: valueNode
+      });
+    } else {
+      _result[keyNode] = valueNode;
+    }
+    delete overridableKeys[keyNode];
+  }
+
+  return _result;
+}
+
+function readLineBreak(state) {
+  var ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x0A/* LF */) {
+    state.position++;
+  } else if (ch === 0x0D/* CR */) {
+    state.position++;
+    if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
+      state.position++;
+    }
+  } else {
+    throwError(state, 'a line break is expected');
+  }
+
+  state.line += 1;
+  state.lineStart = state.position;
+  state.firstTabInLine = -1;
+}
+
+function skipSeparationSpace(state, allowComments, checkIndent) {
+  var lineBreaks = 0,
+      ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    while (is_WHITE_SPACE(ch)) {
+      if (ch === 0x09/* Tab */ && state.firstTabInLine === -1) {
+        state.firstTabInLine = state.position;
+      }
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (allowComments && ch === 0x23/* # */) {
+      do {
+        ch = state.input.charCodeAt(++state.position);
+      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
+    }
+
+    if (is_EOL(ch)) {
+      readLineBreak(state);
+
+      ch = state.input.charCodeAt(state.position);
+      lineBreaks++;
+      state.lineIndent = 0;
+
+      while (ch === 0x20/* Space */) {
+        state.lineIndent++;
+        ch = state.input.charCodeAt(++state.position);
+      }
+    } else {
+      break;
+    }
+  }
+
+  if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
+    throwWarning(state, 'deficient indentation');
+  }
+
+  return lineBreaks;
+}
+
+function testDocumentSeparator(state) {
+  var _position = state.position,
+      ch;
+
+  ch = state.input.charCodeAt(_position);
+
+  // Condition state.position === state.lineStart is tested
+  // in parent on each call, for efficiency. No needs to test here again.
+  if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
+      ch === state.input.charCodeAt(_position + 1) &&
+      ch === state.input.charCodeAt(_position + 2)) {
+
+    _position += 3;
+
+    ch = state.input.charCodeAt(_position);
+
+    if (ch === 0 || is_WS_OR_EOL(ch)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function writeFoldedLines(state, count) {
+  if (count === 1) {
+    state.result += ' ';
+  } else if (count > 1) {
+    state.result += common.repeat('\n', count - 1);
+  }
+}
+
+
+function readPlainScalar(state, nodeIndent, withinFlowCollection) {
+  var preceding,
+      following,
+      captureStart,
+      captureEnd,
+      hasPendingContent,
+      _line,
+      _lineStart,
+      _lineIndent,
+      _kind = state.kind,
+      _result = state.result,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (is_WS_OR_EOL(ch)      ||
+      is_FLOW_INDICATOR(ch) ||
+      ch === 0x23/* # */    ||
+      ch === 0x26/* & */    ||
+      ch === 0x2A/* * */    ||
+      ch === 0x21/* ! */    ||
+      ch === 0x7C/* | */    ||
+      ch === 0x3E/* > */    ||
+      ch === 0x27/* ' */    ||
+      ch === 0x22/* " */    ||
+      ch === 0x25/* % */    ||
+      ch === 0x40/* @ */    ||
+      ch === 0x60/* ` */) {
+    return false;
+  }
+
+  if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (is_WS_OR_EOL(following) ||
+        withinFlowCollection && is_FLOW_INDICATOR(following)) {
+      return false;
+    }
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  captureStart = captureEnd = state.position;
+  hasPendingContent = false;
+
+  while (ch !== 0) {
+    if (ch === 0x3A/* : */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following) ||
+          withinFlowCollection && is_FLOW_INDICATOR(following)) {
+        break;
+      }
+
+    } else if (ch === 0x23/* # */) {
+      preceding = state.input.charCodeAt(state.position - 1);
+
+      if (is_WS_OR_EOL(preceding)) {
+        break;
+      }
+
+    } else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
+               withinFlowCollection && is_FLOW_INDICATOR(ch)) {
+      break;
+
+    } else if (is_EOL(ch)) {
+      _line = state.line;
+      _lineStart = state.lineStart;
+      _lineIndent = state.lineIndent;
+      skipSeparationSpace(state, false, -1);
+
+      if (state.lineIndent >= nodeIndent) {
+        hasPendingContent = true;
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      } else {
+        state.position = captureEnd;
+        state.line = _line;
+        state.lineStart = _lineStart;
+        state.lineIndent = _lineIndent;
+        break;
+      }
+    }
+
+    if (hasPendingContent) {
+      captureSegment(state, captureStart, captureEnd, false);
+      writeFoldedLines(state, state.line - _line);
+      captureStart = captureEnd = state.position;
+      hasPendingContent = false;
+    }
+
+    if (!is_WHITE_SPACE(ch)) {
+      captureEnd = state.position + 1;
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  captureSegment(state, captureStart, captureEnd, false);
+
+  if (state.result) {
+    return true;
+  }
+
+  state.kind = _kind;
+  state.result = _result;
+  return false;
+}
+
+function readSingleQuotedScalar(state, nodeIndent) {
+  var ch,
+      captureStart, captureEnd;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x27/* ' */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x27/* ' */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (ch === 0x27/* ' */) {
+        captureStart = state.position;
+        state.position++;
+        captureEnd = state.position;
+      } else {
+        return true;
+      }
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a single quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a single quoted scalar');
+}
+
+function readDoubleQuotedScalar(state, nodeIndent) {
+  var captureStart,
+      captureEnd,
+      hexLength,
+      hexResult,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x22/* " */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x22/* " */) {
+      captureSegment(state, captureStart, state.position, true);
+      state.position++;
+      return true;
+
+    } else if (ch === 0x5C/* \ */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (is_EOL(ch)) {
+        skipSeparationSpace(state, false, nodeIndent);
+
+        // TODO: rework to inline fn with no type cast?
+      } else if (ch < 256 && simpleEscapeCheck[ch]) {
+        state.result += simpleEscapeMap[ch];
+        state.position++;
+
+      } else if ((tmp = escapedHexLen(ch)) > 0) {
+        hexLength = tmp;
+        hexResult = 0;
+
+        for (; hexLength > 0; hexLength--) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if ((tmp = fromHexCode(ch)) >= 0) {
+            hexResult = (hexResult << 4) + tmp;
+
+          } else {
+            throwError(state, 'expected hexadecimal character');
+          }
+        }
+
+        state.result += charFromCodepoint(hexResult);
+
+        state.position++;
+
+      } else {
+        throwError(state, 'unknown escape sequence');
+      }
+
+      captureStart = captureEnd = state.position;
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a double quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a double quoted scalar');
+}
+
+function readFlowCollection(state, nodeIndent) {
+  var readNext = true,
+      _line,
+      _lineStart,
+      _pos,
+      _tag     = state.tag,
+      _result,
+      _anchor  = state.anchor,
+      following,
+      terminator,
+      isPair,
+      isExplicitPair,
+      isMapping,
+      overridableKeys = Object.create(null),
+      keyNode,
+      keyTag,
+      valueNode,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x5B/* [ */) {
+    terminator = 0x5D;/* ] */
+    isMapping = false;
+    _result = [];
+  } else if (ch === 0x7B/* { */) {
+    terminator = 0x7D;/* } */
+    isMapping = true;
+    _result = {};
+  } else {
+    return false;
+  }
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  while (ch !== 0) {
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === terminator) {
+      state.position++;
+      state.tag = _tag;
+      state.anchor = _anchor;
+      state.kind = isMapping ? 'mapping' : 'sequence';
+      state.result = _result;
+      return true;
+    } else if (!readNext) {
+      throwError(state, 'missed comma between flow collection entries');
+    } else if (ch === 0x2C/* , */) {
+      // "flow collection entries can never be completely empty", as per YAML 1.2, section 7.4
+      throwError(state, "expected the node content, but found ','");
+    }
+
+    keyTag = keyNode = valueNode = null;
+    isPair = isExplicitPair = false;
+
+    if (ch === 0x3F/* ? */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following)) {
+        isPair = isExplicitPair = true;
+        state.position++;
+        skipSeparationSpace(state, true, nodeIndent);
+      }
+    }
+
+    _line = state.line; // Save the current line.
+    _lineStart = state.lineStart;
+    _pos = state.position;
+    composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+    keyTag = state.tag;
+    keyNode = state.result;
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
+      isPair = true;
+      ch = state.input.charCodeAt(++state.position);
+      skipSeparationSpace(state, true, nodeIndent);
+      composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+      valueNode = state.result;
+    }
+
+    if (isMapping) {
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos);
+    } else if (isPair) {
+      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos));
+    } else {
+      _result.push(keyNode);
+    }
+
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x2C/* , */) {
+      readNext = true;
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      readNext = false;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a flow collection');
+}
+
+function readBlockScalar(state, nodeIndent) {
+  var captureStart,
+      folding,
+      chomping       = CHOMPING_CLIP,
+      didReadContent = false,
+      detectedIndent = false,
+      textIndent     = nodeIndent,
+      emptyLines     = 0,
+      atMoreIndented = false,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x7C/* | */) {
+    folding = false;
+  } else if (ch === 0x3E/* > */) {
+    folding = true;
+  } else {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+
+  while (ch !== 0) {
+    ch = state.input.charCodeAt(++state.position);
+
+    if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
+      if (CHOMPING_CLIP === chomping) {
+        chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
+      } else {
+        throwError(state, 'repeat of a chomping mode identifier');
+      }
+
+    } else if ((tmp = fromDecimalCode(ch)) >= 0) {
+      if (tmp === 0) {
+        throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
+      } else if (!detectedIndent) {
+        textIndent = nodeIndent + tmp - 1;
+        detectedIndent = true;
+      } else {
+        throwError(state, 'repeat of an indentation width identifier');
+      }
+
+    } else {
+      break;
+    }
+  }
+
+  if (is_WHITE_SPACE(ch)) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (is_WHITE_SPACE(ch));
+
+    if (ch === 0x23/* # */) {
+      do { ch = state.input.charCodeAt(++state.position); }
+      while (!is_EOL(ch) && (ch !== 0));
+    }
+  }
+
+  while (ch !== 0) {
+    readLineBreak(state);
+    state.lineIndent = 0;
+
+    ch = state.input.charCodeAt(state.position);
+
+    while ((!detectedIndent || state.lineIndent < textIndent) &&
+           (ch === 0x20/* Space */)) {
+      state.lineIndent++;
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (!detectedIndent && state.lineIndent > textIndent) {
+      textIndent = state.lineIndent;
+    }
+
+    if (is_EOL(ch)) {
+      emptyLines++;
+      continue;
+    }
+
+    // End of the scalar.
+    if (state.lineIndent < textIndent) {
+
+      // Perform the chomping.
+      if (chomping === CHOMPING_KEEP) {
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+      } else if (chomping === CHOMPING_CLIP) {
+        if (didReadContent) { // i.e. only if the scalar is not empty.
+          state.result += '\n';
+        }
+      }
+
+      // Break this `while` cycle and go to the funciton's epilogue.
+      break;
+    }
+
+    // Folded style: use fancy rules to handle line breaks.
+    if (folding) {
+
+      // Lines starting with white space characters (more-indented lines) are not folded.
+      if (is_WHITE_SPACE(ch)) {
+        atMoreIndented = true;
+        // except for the first content line (cf. Example 8.1)
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+
+      // End of more-indented block.
+      } else if (atMoreIndented) {
+        atMoreIndented = false;
+        state.result += common.repeat('\n', emptyLines + 1);
+
+      // Just one line break - perceive as the same line.
+      } else if (emptyLines === 0) {
+        if (didReadContent) { // i.e. only if we have already read some scalar content.
+          state.result += ' ';
+        }
+
+      // Several line breaks - perceive as different lines.
+      } else {
+        state.result += common.repeat('\n', emptyLines);
+      }
+
+    // Literal style: just add exact number of line breaks between content lines.
+    } else {
+      // Keep all line breaks except the header line break.
+      state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+    }
+
+    didReadContent = true;
+    detectedIndent = true;
+    emptyLines = 0;
+    captureStart = state.position;
+
+    while (!is_EOL(ch) && (ch !== 0)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    captureSegment(state, captureStart, state.position, false);
+  }
+
+  return true;
+}
+
+function readBlockSequence(state, nodeIndent) {
+  var _line,
+      _tag      = state.tag,
+      _anchor   = state.anchor,
+      _result   = [],
+      following,
+      detected  = false,
+      ch;
+
+  // there is a leading tab before this token, so it can't be a block sequence/mapping;
+  // it can still be flow sequence/mapping or a scalar
+  if (state.firstTabInLine !== -1) return false;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    if (state.firstTabInLine !== -1) {
+      state.position = state.firstTabInLine;
+      throwError(state, 'tab characters must not be used in indentation');
+    }
+
+    if (ch !== 0x2D/* - */) {
+      break;
+    }
+
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (!is_WS_OR_EOL(following)) {
+      break;
+    }
+
+    detected = true;
+    state.position++;
+
+    if (skipSeparationSpace(state, true, -1)) {
+      if (state.lineIndent <= nodeIndent) {
+        _result.push(null);
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      }
+    }
+
+    _line = state.line;
+    composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
+    _result.push(state.result);
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+      throwError(state, 'bad indentation of a sequence entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'sequence';
+    state.result = _result;
+    return true;
+  }
+  return false;
+}
+
+function readBlockMapping(state, nodeIndent, flowIndent) {
+  var following,
+      allowCompact,
+      _line,
+      _keyLine,
+      _keyLineStart,
+      _keyPos,
+      _tag          = state.tag,
+      _anchor       = state.anchor,
+      _result       = {},
+      overridableKeys = Object.create(null),
+      keyTag        = null,
+      keyNode       = null,
+      valueNode     = null,
+      atExplicitKey = false,
+      detected      = false,
+      ch;
+
+  // there is a leading tab before this token, so it can't be a block sequence/mapping;
+  // it can still be flow sequence/mapping or a scalar
+  if (state.firstTabInLine !== -1) return false;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    if (!atExplicitKey && state.firstTabInLine !== -1) {
+      state.position = state.firstTabInLine;
+      throwError(state, 'tab characters must not be used in indentation');
+    }
+
+    following = state.input.charCodeAt(state.position + 1);
+    _line = state.line; // Save the current line.
+
+    //
+    // Explicit notation case. There are two separate blocks:
+    // first for the key (denoted by "?") and second for the value (denoted by ":")
+    //
+    if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
+
+      if (ch === 0x3F/* ? */) {
+        if (atExplicitKey) {
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+          keyTag = keyNode = valueNode = null;
+        }
+
+        detected = true;
+        atExplicitKey = true;
+        allowCompact = true;
+
+      } else if (atExplicitKey) {
+        // i.e. 0x3A/* : */ === character after the explicit key.
+        atExplicitKey = false;
+        allowCompact = true;
+
+      } else {
+        throwError(state, 'incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line');
+      }
+
+      state.position += 1;
+      ch = following;
+
+    //
+    // Implicit notation case. Flow-style node as the key first, then ":", and the value.
+    //
+    } else {
+      _keyLine = state.line;
+      _keyLineStart = state.lineStart;
+      _keyPos = state.position;
+
+      if (!composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+        // Neither implicit nor explicit notation.
+        // Reading is done. Go to the epilogue.
+        break;
+      }
+
+      if (state.line === _line) {
+        ch = state.input.charCodeAt(state.position);
+
+        while (is_WHITE_SPACE(ch)) {
+          ch = state.input.charCodeAt(++state.position);
+        }
+
+        if (ch === 0x3A/* : */) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if (!is_WS_OR_EOL(ch)) {
+            throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
+          }
+
+          if (atExplicitKey) {
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+            keyTag = keyNode = valueNode = null;
+          }
+
+          detected = true;
+          atExplicitKey = false;
+          allowCompact = false;
+          keyTag = state.tag;
+          keyNode = state.result;
+
+        } else if (detected) {
+          throwError(state, 'can not read an implicit mapping pair; a colon is missed');
+
+        } else {
+          state.tag = _tag;
+          state.anchor = _anchor;
+          return true; // Keep the result of `composeNode`.
+        }
+
+      } else if (detected) {
+        throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');
+
+      } else {
+        state.tag = _tag;
+        state.anchor = _anchor;
+        return true; // Keep the result of `composeNode`.
+      }
+    }
+
+    //
+    // Common reading code for both explicit and implicit notations.
+    //
+    if (state.line === _line || state.lineIndent > nodeIndent) {
+      if (atExplicitKey) {
+        _keyLine = state.line;
+        _keyLineStart = state.lineStart;
+        _keyPos = state.position;
+      }
+
+      if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
+        if (atExplicitKey) {
+          keyNode = state.result;
+        } else {
+          valueNode = state.result;
+        }
+      }
+
+      if (!atExplicitKey) {
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _keyLine, _keyLineStart, _keyPos);
+        keyTag = keyNode = valueNode = null;
+      }
+
+      skipSeparationSpace(state, true, -1);
+      ch = state.input.charCodeAt(state.position);
+    }
+
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+      throwError(state, 'bad indentation of a mapping entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  //
+  // Epilogue.
+  //
+
+  // Special case: last mapping's node contains only the key in explicit notation.
+  if (atExplicitKey) {
+    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
+  }
+
+  // Expose the resulting mapping.
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'mapping';
+    state.result = _result;
+  }
+
+  return detected;
+}
+
+function readTagProperty(state) {
+  var _position,
+      isVerbatim = false,
+      isNamed    = false,
+      tagHandle,
+      tagName,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x21/* ! */) return false;
+
+  if (state.tag !== null) {
+    throwError(state, 'duplication of a tag property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  if (ch === 0x3C/* < */) {
+    isVerbatim = true;
+    ch = state.input.charCodeAt(++state.position);
+
+  } else if (ch === 0x21/* ! */) {
+    isNamed = true;
+    tagHandle = '!!';
+    ch = state.input.charCodeAt(++state.position);
+
+  } else {
+    tagHandle = '!';
+  }
+
+  _position = state.position;
+
+  if (isVerbatim) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (ch !== 0 && ch !== 0x3E/* > */);
+
+    if (state.position < state.length) {
+      tagName = state.input.slice(_position, state.position);
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      throwError(state, 'unexpected end of the stream within a verbatim tag');
+    }
+  } else {
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+
+      if (ch === 0x21/* ! */) {
+        if (!isNamed) {
+          tagHandle = state.input.slice(_position - 1, state.position + 1);
+
+          if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
+            throwError(state, 'named tag handle cannot contain such characters');
+          }
+
+          isNamed = true;
+          _position = state.position + 1;
+        } else {
+          throwError(state, 'tag suffix cannot contain exclamation marks');
+        }
+      }
+
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    tagName = state.input.slice(_position, state.position);
+
+    if (PATTERN_FLOW_INDICATORS.test(tagName)) {
+      throwError(state, 'tag suffix cannot contain flow indicator characters');
+    }
+  }
+
+  if (tagName && !PATTERN_TAG_URI.test(tagName)) {
+    throwError(state, 'tag name cannot contain such characters: ' + tagName);
+  }
+
+  try {
+    tagName = decodeURIComponent(tagName);
+  } catch (err) {
+    throwError(state, 'tag name is malformed: ' + tagName);
+  }
+
+  if (isVerbatim) {
+    state.tag = tagName;
+
+  } else if (_hasOwnProperty.call(state.tagMap, tagHandle)) {
+    state.tag = state.tagMap[tagHandle] + tagName;
+
+  } else if (tagHandle === '!') {
+    state.tag = '!' + tagName;
+
+  } else if (tagHandle === '!!') {
+    state.tag = 'tag:yaml.org,2002:' + tagName;
+
+  } else {
+    throwError(state, 'undeclared tag handle "' + tagHandle + '"');
+  }
+
+  return true;
+}
+
+function readAnchorProperty(state) {
+  var _position,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x26/* & */) return false;
+
+  if (state.anchor !== null) {
+    throwError(state, 'duplication of an anchor property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an anchor node must contain at least one character');
+  }
+
+  state.anchor = state.input.slice(_position, state.position);
+  return true;
+}
+
+function readAlias(state) {
+  var _position, alias,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x2A/* * */) return false;
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an alias node must contain at least one character');
+  }
+
+  alias = state.input.slice(_position, state.position);
+
+  if (!_hasOwnProperty.call(state.anchorMap, alias)) {
+    throwError(state, 'unidentified alias "' + alias + '"');
+  }
+
+  state.result = state.anchorMap[alias];
+  skipSeparationSpace(state, true, -1);
+  return true;
+}
+
+function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
+  var allowBlockStyles,
+      allowBlockScalars,
+      allowBlockCollections,
+      indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
+      atNewLine  = false,
+      hasContent = false,
+      typeIndex,
+      typeQuantity,
+      typeList,
+      type,
+      flowIndent,
+      blockIndent;
+
+  if (state.listener !== null) {
+    state.listener('open', state);
+  }
+
+  state.tag    = null;
+  state.anchor = null;
+  state.kind   = null;
+  state.result = null;
+
+  allowBlockStyles = allowBlockScalars = allowBlockCollections =
+    CONTEXT_BLOCK_OUT === nodeContext ||
+    CONTEXT_BLOCK_IN  === nodeContext;
+
+  if (allowToSeek) {
+    if (skipSeparationSpace(state, true, -1)) {
+      atNewLine = true;
+
+      if (state.lineIndent > parentIndent) {
+        indentStatus = 1;
+      } else if (state.lineIndent === parentIndent) {
+        indentStatus = 0;
+      } else if (state.lineIndent < parentIndent) {
+        indentStatus = -1;
+      }
+    }
+  }
+
+  if (indentStatus === 1) {
+    while (readTagProperty(state) || readAnchorProperty(state)) {
+      if (skipSeparationSpace(state, true, -1)) {
+        atNewLine = true;
+        allowBlockCollections = allowBlockStyles;
+
+        if (state.lineIndent > parentIndent) {
+          indentStatus = 1;
+        } else if (state.lineIndent === parentIndent) {
+          indentStatus = 0;
+        } else if (state.lineIndent < parentIndent) {
+          indentStatus = -1;
+        }
+      } else {
+        allowBlockCollections = false;
+      }
+    }
+  }
+
+  if (allowBlockCollections) {
+    allowBlockCollections = atNewLine || allowCompact;
+  }
+
+  if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
+    if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
+      flowIndent = parentIndent;
+    } else {
+      flowIndent = parentIndent + 1;
+    }
+
+    blockIndent = state.position - state.lineStart;
+
+    if (indentStatus === 1) {
+      if (allowBlockCollections &&
+          (readBlockSequence(state, blockIndent) ||
+           readBlockMapping(state, blockIndent, flowIndent)) ||
+          readFlowCollection(state, flowIndent)) {
+        hasContent = true;
+      } else {
+        if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
+            readSingleQuotedScalar(state, flowIndent) ||
+            readDoubleQuotedScalar(state, flowIndent)) {
+          hasContent = true;
+
+        } else if (readAlias(state)) {
+          hasContent = true;
+
+          if (state.tag !== null || state.anchor !== null) {
+            throwError(state, 'alias node should not have any properties');
+          }
+
+        } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
+          hasContent = true;
+
+          if (state.tag === null) {
+            state.tag = '?';
+          }
+        }
+
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    } else if (indentStatus === 0) {
+      // Special case: block sequences are allowed to have same indentation level as the parent.
+      // http://www.yaml.org/spec/1.2/spec.html#id2799784
+      hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
+    }
+  }
+
+  if (state.tag === null) {
+    if (state.anchor !== null) {
+      state.anchorMap[state.anchor] = state.result;
+    }
+
+  } else if (state.tag === '?') {
+    // Implicit resolving is not allowed for non-scalar types, and '?'
+    // non-specific tag is only automatically assigned to plain scalars.
+    //
+    // We only need to check kind conformity in case user explicitly assigns '?'
+    // tag, for example like this: "!<?> [0]"
+    //
+    if (state.result !== null && state.kind !== 'scalar') {
+      throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
+    }
+
+    for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
+      type = state.implicitTypes[typeIndex];
+
+      if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
+        state.result = type.construct(state.result);
+        state.tag = type.tag;
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+        break;
+      }
+    }
+  } else if (state.tag !== '!') {
+    if (_hasOwnProperty.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+      type = state.typeMap[state.kind || 'fallback'][state.tag];
+    } else {
+      // looking for multi type
+      type = null;
+      typeList = state.typeMap.multi[state.kind || 'fallback'];
+
+      for (typeIndex = 0, typeQuantity = typeList.length; typeIndex < typeQuantity; typeIndex += 1) {
+        if (state.tag.slice(0, typeList[typeIndex].tag.length) === typeList[typeIndex].tag) {
+          type = typeList[typeIndex];
+          break;
+        }
+      }
+    }
+
+    if (!type) {
+      throwError(state, 'unknown tag !<' + state.tag + '>');
+    }
+
+    if (state.result !== null && type.kind !== state.kind) {
+      throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+    }
+
+    if (!type.resolve(state.result, state.tag)) { // `state.result` updated in resolver if matched
+      throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+    } else {
+      state.result = type.construct(state.result, state.tag);
+      if (state.anchor !== null) {
+        state.anchorMap[state.anchor] = state.result;
+      }
+    }
+  }
+
+  if (state.listener !== null) {
+    state.listener('close', state);
+  }
+  return state.tag !== null ||  state.anchor !== null || hasContent;
+}
+
+function readDocument(state) {
+  var documentStart = state.position,
+      _position,
+      directiveName,
+      directiveArgs,
+      hasDirectives = false,
+      ch;
+
+  state.version = null;
+  state.checkLineBreaks = state.legacy;
+  state.tagMap = Object.create(null);
+  state.anchorMap = Object.create(null);
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (state.lineIndent > 0 || ch !== 0x25/* % */) {
+      break;
+    }
+
+    hasDirectives = true;
+    ch = state.input.charCodeAt(++state.position);
+    _position = state.position;
+
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    directiveName = state.input.slice(_position, state.position);
+    directiveArgs = [];
+
+    if (directiveName.length < 1) {
+      throwError(state, 'directive name must not be less than one character in length');
+    }
+
+    while (ch !== 0) {
+      while (is_WHITE_SPACE(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      if (ch === 0x23/* # */) {
+        do { ch = state.input.charCodeAt(++state.position); }
+        while (ch !== 0 && !is_EOL(ch));
+        break;
+      }
+
+      if (is_EOL(ch)) break;
+
+      _position = state.position;
+
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      directiveArgs.push(state.input.slice(_position, state.position));
+    }
+
+    if (ch !== 0) readLineBreak(state);
+
+    if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
+      directiveHandlers[directiveName](state, directiveName, directiveArgs);
+    } else {
+      throwWarning(state, 'unknown document directive "' + directiveName + '"');
+    }
+  }
+
+  skipSeparationSpace(state, true, -1);
+
+  if (state.lineIndent === 0 &&
+      state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
+    state.position += 3;
+    skipSeparationSpace(state, true, -1);
+
+  } else if (hasDirectives) {
+    throwError(state, 'directives end mark is expected');
+  }
+
+  composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
+  skipSeparationSpace(state, true, -1);
+
+  if (state.checkLineBreaks &&
+      PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
+    throwWarning(state, 'non-ASCII line breaks are interpreted as content');
+  }
+
+  state.documents.push(state.result);
+
+  if (state.position === state.lineStart && testDocumentSeparator(state)) {
+
+    if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
+      state.position += 3;
+      skipSeparationSpace(state, true, -1);
+    }
+    return;
+  }
+
+  if (state.position < (state.length - 1)) {
+    throwError(state, 'end of the stream or a document separator is expected');
+  } else {
+    return;
+  }
+}
+
+
+function loadDocuments(input, options) {
+  input = String(input);
+  options = options || {};
+
+  if (input.length !== 0) {
+
+    // Add tailing `\n` if not exists
+    if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
+        input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
+      input += '\n';
+    }
+
+    // Strip BOM
+    if (input.charCodeAt(0) === 0xFEFF) {
+      input = input.slice(1);
+    }
+  }
+
+  var state = new State(input, options);
+
+  var nullpos = input.indexOf('\0');
+
+  if (nullpos !== -1) {
+    state.position = nullpos;
+    throwError(state, 'null byte is not allowed in input');
+  }
+
+  // Use 0 as string terminator. That significantly simplifies bounds check.
+  state.input += '\0';
+
+  while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
+    state.lineIndent += 1;
+    state.position += 1;
+  }
+
+  while (state.position < (state.length - 1)) {
+    readDocument(state);
+  }
+
+  return state.documents;
+}
+
+
+function loadAll(input, iterator, options) {
+  if (iterator !== null && typeof iterator === 'object' && typeof options === 'undefined') {
+    options = iterator;
+    iterator = null;
+  }
+
+  var documents = loadDocuments(input, options);
+
+  if (typeof iterator !== 'function') {
+    return documents;
+  }
+
+  for (var index = 0, length = documents.length; index < length; index += 1) {
+    iterator(documents[index]);
+  }
+}
+
+
+function load(input, options) {
+  var documents = loadDocuments(input, options);
+
+  if (documents.length === 0) {
+    /*eslint-disable no-undefined*/
+    return undefined;
+  } else if (documents.length === 1) {
+    return documents[0];
+  }
+  throw new YAMLException('expected a single document in the stream, but found more');
+}
+
+
+module.exports.loadAll = loadAll;
+module.exports.load    = load;
diff --git a/node_modules/js-yaml/lib/schema.js b/node_modules/js-yaml/lib/schema.js
new file mode 100644
index 0000000..65b41f4
--- /dev/null
+++ b/node_modules/js-yaml/lib/schema.js
@@ -0,0 +1,121 @@
+'use strict';
+
+/*eslint-disable max-len*/
+
+var YAMLException = require('./exception');
+var Type          = require('./type');
+
+
+function compileList(schema, name) {
+  var result = [];
+
+  schema[name].forEach(function (currentType) {
+    var newIndex = result.length;
+
+    result.forEach(function (previousType, previousIndex) {
+      if (previousType.tag === currentType.tag &&
+          previousType.kind === currentType.kind &&
+          previousType.multi === currentType.multi) {
+
+        newIndex = previousIndex;
+      }
+    });
+
+    result[newIndex] = currentType;
+  });
+
+  return result;
+}
+
+
+function compileMap(/* lists... */) {
+  var result = {
+        scalar: {},
+        sequence: {},
+        mapping: {},
+        fallback: {},
+        multi: {
+          scalar: [],
+          sequence: [],
+          mapping: [],
+          fallback: []
+        }
+      }, index, length;
+
+  function collectType(type) {
+    if (type.multi) {
+      result.multi[type.kind].push(type);
+      result.multi['fallback'].push(type);
+    } else {
+      result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+    }
+  }
+
+  for (index = 0, length = arguments.length; index < length; index += 1) {
+    arguments[index].forEach(collectType);
+  }
+  return result;
+}
+
+
+function Schema(definition) {
+  return this.extend(definition);
+}
+
+
+Schema.prototype.extend = function extend(definition) {
+  var implicit = [];
+  var explicit = [];
+
+  if (definition instanceof Type) {
+    // Schema.extend(type)
+    explicit.push(definition);
+
+  } else if (Array.isArray(definition)) {
+    // Schema.extend([ type1, type2, ... ])
+    explicit = explicit.concat(definition);
+
+  } else if (definition && (Array.isArray(definition.implicit) || Array.isArray(definition.explicit))) {
+    // Schema.extend({ explicit: [ type1, type2, ... ], implicit: [ type1, type2, ... ] })
+    if (definition.implicit) implicit = implicit.concat(definition.implicit);
+    if (definition.explicit) explicit = explicit.concat(definition.explicit);
+
+  } else {
+    throw new YAMLException('Schema.extend argument should be a Type, [ Type ], ' +
+      'or a schema definition ({ implicit: [...], explicit: [...] })');
+  }
+
+  implicit.forEach(function (type) {
+    if (!(type instanceof Type)) {
+      throw new YAMLException('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+    }
+
+    if (type.loadKind && type.loadKind !== 'scalar') {
+      throw new YAMLException('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
+    }
+
+    if (type.multi) {
+      throw new YAMLException('There is a multi type in the implicit list of a schema. Multi tags can only be listed as explicit.');
+    }
+  });
+
+  explicit.forEach(function (type) {
+    if (!(type instanceof Type)) {
+      throw new YAMLException('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+    }
+  });
+
+  var result = Object.create(Schema.prototype);
+
+  result.implicit = (this.implicit || []).concat(implicit);
+  result.explicit = (this.explicit || []).concat(explicit);
+
+  result.compiledImplicit = compileList(result, 'implicit');
+  result.compiledExplicit = compileList(result, 'explicit');
+  result.compiledTypeMap  = compileMap(result.compiledImplicit, result.compiledExplicit);
+
+  return result;
+};
+
+
+module.exports = Schema;
diff --git a/node_modules/js-yaml/lib/schema/core.js b/node_modules/js-yaml/lib/schema/core.js
new file mode 100644
index 0000000..608b26d
--- /dev/null
+++ b/node_modules/js-yaml/lib/schema/core.js
@@ -0,0 +1,11 @@
+// Standard YAML's Core schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2804923
+//
+// NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
+// So, Core schema has no distinctions from JSON schema is JS-YAML.
+
+
+'use strict';
+
+
+module.exports = require('./json');
diff --git a/node_modules/js-yaml/lib/schema/default.js b/node_modules/js-yaml/lib/schema/default.js
new file mode 100644
index 0000000..3af0520
--- /dev/null
+++ b/node_modules/js-yaml/lib/schema/default.js
@@ -0,0 +1,22 @@
+// JS-YAML's default schema for `safeLoad` function.
+// It is not described in the YAML specification.
+//
+// This schema is based on standard YAML's Core schema and includes most of
+// extra types described at YAML tag repository. (http://yaml.org/type/)
+
+
+'use strict';
+
+
+module.exports = require('./core').extend({
+  implicit: [
+    require('../type/timestamp'),
+    require('../type/merge')
+  ],
+  explicit: [
+    require('../type/binary'),
+    require('../type/omap'),
+    require('../type/pairs'),
+    require('../type/set')
+  ]
+});
diff --git a/node_modules/js-yaml/lib/schema/failsafe.js b/node_modules/js-yaml/lib/schema/failsafe.js
new file mode 100644
index 0000000..b7a33eb
--- /dev/null
+++ b/node_modules/js-yaml/lib/schema/failsafe.js
@@ -0,0 +1,17 @@
+// Standard YAML's Failsafe schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2802346
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  explicit: [
+    require('../type/str'),
+    require('../type/seq'),
+    require('../type/map')
+  ]
+});
diff --git a/node_modules/js-yaml/lib/schema/json.js b/node_modules/js-yaml/lib/schema/json.js
new file mode 100644
index 0000000..b73df78
--- /dev/null
+++ b/node_modules/js-yaml/lib/schema/json.js
@@ -0,0 +1,19 @@
+// Standard YAML's JSON schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2803231
+//
+// NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
+// So, this schema is not such strict as defined in the YAML specification.
+// It allows numbers in binary notaion, use `Null` and `NULL` as `null`, etc.
+
+
+'use strict';
+
+
+module.exports = require('./failsafe').extend({
+  implicit: [
+    require('../type/null'),
+    require('../type/bool'),
+    require('../type/int'),
+    require('../type/float')
+  ]
+});
diff --git a/node_modules/js-yaml/lib/snippet.js b/node_modules/js-yaml/lib/snippet.js
new file mode 100644
index 0000000..00e2133
--- /dev/null
+++ b/node_modules/js-yaml/lib/snippet.js
@@ -0,0 +1,101 @@
+'use strict';
+
+
+var common = require('./common');
+
+
+// get snippet for a single line, respecting maxLength
+function getLine(buffer, lineStart, lineEnd, position, maxLineLength) {
+  var head = '';
+  var tail = '';
+  var maxHalfLength = Math.floor(maxLineLength / 2) - 1;
+
+  if (position - lineStart > maxHalfLength) {
+    head = ' ... ';
+    lineStart = position - maxHalfLength + head.length;
+  }
+
+  if (lineEnd - position > maxHalfLength) {
+    tail = ' ...';
+    lineEnd = position + maxHalfLength - tail.length;
+  }
+
+  return {
+    str: head + buffer.slice(lineStart, lineEnd).replace(/\t/g, '→') + tail,
+    pos: position - lineStart + head.length // relative position
+  };
+}
+
+
+function padStart(string, max) {
+  return common.repeat(' ', max - string.length) + string;
+}
+
+
+function makeSnippet(mark, options) {
+  options = Object.create(options || null);
+
+  if (!mark.buffer) return null;
+
+  if (!options.maxLength) options.maxLength = 79;
+  if (typeof options.indent      !== 'number') options.indent      = 1;
+  if (typeof options.linesBefore !== 'number') options.linesBefore = 3;
+  if (typeof options.linesAfter  !== 'number') options.linesAfter  = 2;
+
+  var re = /\r?\n|\r|\0/g;
+  var lineStarts = [ 0 ];
+  var lineEnds = [];
+  var match;
+  var foundLineNo = -1;
+
+  while ((match = re.exec(mark.buffer))) {
+    lineEnds.push(match.index);
+    lineStarts.push(match.index + match[0].length);
+
+    if (mark.position <= match.index && foundLineNo < 0) {
+      foundLineNo = lineStarts.length - 2;
+    }
+  }
+
+  if (foundLineNo < 0) foundLineNo = lineStarts.length - 1;
+
+  var result = '', i, line;
+  var lineNoLength = Math.min(mark.line + options.linesAfter, lineEnds.length).toString().length;
+  var maxLineLength = options.maxLength - (options.indent + lineNoLength + 3);
+
+  for (i = 1; i <= options.linesBefore; i++) {
+    if (foundLineNo - i < 0) break;
+    line = getLine(
+      mark.buffer,
+      lineStarts[foundLineNo - i],
+      lineEnds[foundLineNo - i],
+      mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo - i]),
+      maxLineLength
+    );
+    result = common.repeat(' ', options.indent) + padStart((mark.line - i + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n' + result;
+  }
+
+  line = getLine(mark.buffer, lineStarts[foundLineNo], lineEnds[foundLineNo], mark.position, maxLineLength);
+  result += common.repeat(' ', options.indent) + padStart((mark.line + 1).toString(), lineNoLength) +
+    ' | ' + line.str + '\n';
+  result += common.repeat('-', options.indent + lineNoLength + 3 + line.pos) + '^' + '\n';
+
+  for (i = 1; i <= options.linesAfter; i++) {
+    if (foundLineNo + i >= lineEnds.length) break;
+    line = getLine(
+      mark.buffer,
+      lineStarts[foundLineNo + i],
+      lineEnds[foundLineNo + i],
+      mark.position - (lineStarts[foundLineNo] - lineStarts[foundLineNo + i]),
+      maxLineLength
+    );
+    result += common.repeat(' ', options.indent) + padStart((mark.line + i + 1).toString(), lineNoLength) +
+      ' | ' + line.str + '\n';
+  }
+
+  return result.replace(/\n$/, '');
+}
+
+
+module.exports = makeSnippet;
diff --git a/node_modules/js-yaml/lib/type.js b/node_modules/js-yaml/lib/type.js
new file mode 100644
index 0000000..5e57877
--- /dev/null
+++ b/node_modules/js-yaml/lib/type.js
@@ -0,0 +1,66 @@
+'use strict';
+
+var YAMLException = require('./exception');
+
+var TYPE_CONSTRUCTOR_OPTIONS = [
+  'kind',
+  'multi',
+  'resolve',
+  'construct',
+  'instanceOf',
+  'predicate',
+  'represent',
+  'representName',
+  'defaultStyle',
+  'styleAliases'
+];
+
+var YAML_NODE_KINDS = [
+  'scalar',
+  'sequence',
+  'mapping'
+];
+
+function compileStyleAliases(map) {
+  var result = {};
+
+  if (map !== null) {
+    Object.keys(map).forEach(function (style) {
+      map[style].forEach(function (alias) {
+        result[String(alias)] = style;
+      });
+    });
+  }
+
+  return result;
+}
+
+function Type(tag, options) {
+  options = options || {};
+
+  Object.keys(options).forEach(function (name) {
+    if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
+      throw new YAMLException('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
+    }
+  });
+
+  // TODO: Add tag format check.
+  this.options       = options; // keep original options in case user wants to extend this type later
+  this.tag           = tag;
+  this.kind          = options['kind']          || null;
+  this.resolve       = options['resolve']       || function () { return true; };
+  this.construct     = options['construct']     || function (data) { return data; };
+  this.instanceOf    = options['instanceOf']    || null;
+  this.predicate     = options['predicate']     || null;
+  this.represent     = options['represent']     || null;
+  this.representName = options['representName'] || null;
+  this.defaultStyle  = options['defaultStyle']  || null;
+  this.multi         = options['multi']         || false;
+  this.styleAliases  = compileStyleAliases(options['styleAliases'] || null);
+
+  if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
+    throw new YAMLException('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
+  }
+}
+
+module.exports = Type;
diff --git a/node_modules/js-yaml/lib/type/binary.js b/node_modules/js-yaml/lib/type/binary.js
new file mode 100644
index 0000000..e152351
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/binary.js
@@ -0,0 +1,125 @@
+'use strict';
+
+/*eslint-disable no-bitwise*/
+
+
+var Type = require('../type');
+
+
+// [ 64, 65, 66 ] -> [ padding, CR, LF ]
+var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
+
+
+function resolveYamlBinary(data) {
+  if (data === null) return false;
+
+  var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
+
+  // Convert one by one.
+  for (idx = 0; idx < max; idx++) {
+    code = map.indexOf(data.charAt(idx));
+
+    // Skip CR/LF
+    if (code > 64) continue;
+
+    // Fail on illegal characters
+    if (code < 0) return false;
+
+    bitlen += 6;
+  }
+
+  // If there are any bits left, source was corrupted
+  return (bitlen % 8) === 0;
+}
+
+function constructYamlBinary(data) {
+  var idx, tailbits,
+      input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
+      max = input.length,
+      map = BASE64_MAP,
+      bits = 0,
+      result = [];
+
+  // Collect by 6*4 bits (3 bytes)
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 4 === 0) && idx) {
+      result.push((bits >> 16) & 0xFF);
+      result.push((bits >> 8) & 0xFF);
+      result.push(bits & 0xFF);
+    }
+
+    bits = (bits << 6) | map.indexOf(input.charAt(idx));
+  }
+
+  // Dump tail
+
+  tailbits = (max % 4) * 6;
+
+  if (tailbits === 0) {
+    result.push((bits >> 16) & 0xFF);
+    result.push((bits >> 8) & 0xFF);
+    result.push(bits & 0xFF);
+  } else if (tailbits === 18) {
+    result.push((bits >> 10) & 0xFF);
+    result.push((bits >> 2) & 0xFF);
+  } else if (tailbits === 12) {
+    result.push((bits >> 4) & 0xFF);
+  }
+
+  return new Uint8Array(result);
+}
+
+function representYamlBinary(object /*, style*/) {
+  var result = '', bits = 0, idx, tail,
+      max = object.length,
+      map = BASE64_MAP;
+
+  // Convert every three bytes to 4 ASCII characters.
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 3 === 0) && idx) {
+      result += map[(bits >> 18) & 0x3F];
+      result += map[(bits >> 12) & 0x3F];
+      result += map[(bits >> 6) & 0x3F];
+      result += map[bits & 0x3F];
+    }
+
+    bits = (bits << 8) + object[idx];
+  }
+
+  // Dump tail
+
+  tail = max % 3;
+
+  if (tail === 0) {
+    result += map[(bits >> 18) & 0x3F];
+    result += map[(bits >> 12) & 0x3F];
+    result += map[(bits >> 6) & 0x3F];
+    result += map[bits & 0x3F];
+  } else if (tail === 2) {
+    result += map[(bits >> 10) & 0x3F];
+    result += map[(bits >> 4) & 0x3F];
+    result += map[(bits << 2) & 0x3F];
+    result += map[64];
+  } else if (tail === 1) {
+    result += map[(bits >> 2) & 0x3F];
+    result += map[(bits << 4) & 0x3F];
+    result += map[64];
+    result += map[64];
+  }
+
+  return result;
+}
+
+function isBinary(obj) {
+  return Object.prototype.toString.call(obj) ===  '[object Uint8Array]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:binary', {
+  kind: 'scalar',
+  resolve: resolveYamlBinary,
+  construct: constructYamlBinary,
+  predicate: isBinary,
+  represent: representYamlBinary
+});
diff --git a/node_modules/js-yaml/lib/type/bool.js b/node_modules/js-yaml/lib/type/bool.js
new file mode 100644
index 0000000..cb77459
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/bool.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlBoolean(data) {
+  if (data === null) return false;
+
+  var max = data.length;
+
+  return (max === 4 && (data === 'true' || data === 'True' || data === 'TRUE')) ||
+         (max === 5 && (data === 'false' || data === 'False' || data === 'FALSE'));
+}
+
+function constructYamlBoolean(data) {
+  return data === 'true' ||
+         data === 'True' ||
+         data === 'TRUE';
+}
+
+function isBoolean(object) {
+  return Object.prototype.toString.call(object) === '[object Boolean]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:bool', {
+  kind: 'scalar',
+  resolve: resolveYamlBoolean,
+  construct: constructYamlBoolean,
+  predicate: isBoolean,
+  represent: {
+    lowercase: function (object) { return object ? 'true' : 'false'; },
+    uppercase: function (object) { return object ? 'TRUE' : 'FALSE'; },
+    camelcase: function (object) { return object ? 'True' : 'False'; }
+  },
+  defaultStyle: 'lowercase'
+});
diff --git a/node_modules/js-yaml/lib/type/float.js b/node_modules/js-yaml/lib/type/float.js
new file mode 100644
index 0000000..74d77ec
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/float.js
@@ -0,0 +1,97 @@
+'use strict';
+
+var common = require('../common');
+var Type   = require('../type');
+
+var YAML_FLOAT_PATTERN = new RegExp(
+  // 2.5e4, 2.5 and integers
+  '^(?:[-+]?(?:[0-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
+  // .2e4, .2
+  // special case, seems not from spec
+  '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
+  // .inf
+  '|[-+]?\\.(?:inf|Inf|INF)' +
+  // .nan
+  '|\\.(?:nan|NaN|NAN))$');
+
+function resolveYamlFloat(data) {
+  if (data === null) return false;
+
+  if (!YAML_FLOAT_PATTERN.test(data) ||
+      // Quick hack to not allow integers end with `_`
+      // Probably should update regexp & check speed
+      data[data.length - 1] === '_') {
+    return false;
+  }
+
+  return true;
+}
+
+function constructYamlFloat(data) {
+  var value, sign;
+
+  value  = data.replace(/_/g, '').toLowerCase();
+  sign   = value[0] === '-' ? -1 : 1;
+
+  if ('+-'.indexOf(value[0]) >= 0) {
+    value = value.slice(1);
+  }
+
+  if (value === '.inf') {
+    return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
+
+  } else if (value === '.nan') {
+    return NaN;
+  }
+  return sign * parseFloat(value, 10);
+}
+
+
+var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
+
+function representYamlFloat(object, style) {
+  var res;
+
+  if (isNaN(object)) {
+    switch (style) {
+      case 'lowercase': return '.nan';
+      case 'uppercase': return '.NAN';
+      case 'camelcase': return '.NaN';
+    }
+  } else if (Number.POSITIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '.inf';
+      case 'uppercase': return '.INF';
+      case 'camelcase': return '.Inf';
+    }
+  } else if (Number.NEGATIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '-.inf';
+      case 'uppercase': return '-.INF';
+      case 'camelcase': return '-.Inf';
+    }
+  } else if (common.isNegativeZero(object)) {
+    return '-0.0';
+  }
+
+  res = object.toString(10);
+
+  // JS stringifier can build scientific format without dots: 5e-100,
+  // while YAML requres dot: 5.e-100. Fix it with simple hack
+
+  return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
+}
+
+function isFloat(object) {
+  return (Object.prototype.toString.call(object) === '[object Number]') &&
+         (object % 1 !== 0 || common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:float', {
+  kind: 'scalar',
+  resolve: resolveYamlFloat,
+  construct: constructYamlFloat,
+  predicate: isFloat,
+  represent: representYamlFloat,
+  defaultStyle: 'lowercase'
+});
diff --git a/node_modules/js-yaml/lib/type/int.js b/node_modules/js-yaml/lib/type/int.js
new file mode 100644
index 0000000..3fe3a44
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/int.js
@@ -0,0 +1,156 @@
+'use strict';
+
+var common = require('../common');
+var Type   = require('../type');
+
+function isHexCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
+         ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
+         ((0x61/* a */ <= c) && (c <= 0x66/* f */));
+}
+
+function isOctCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
+}
+
+function isDecCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
+}
+
+function resolveYamlInteger(data) {
+  if (data === null) return false;
+
+  var max = data.length,
+      index = 0,
+      hasDigits = false,
+      ch;
+
+  if (!max) return false;
+
+  ch = data[index];
+
+  // sign
+  if (ch === '-' || ch === '+') {
+    ch = data[++index];
+  }
+
+  if (ch === '0') {
+    // 0
+    if (index + 1 === max) return true;
+    ch = data[++index];
+
+    // base 2, base 8, base 16
+
+    if (ch === 'b') {
+      // base 2
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (ch !== '0' && ch !== '1') return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
+    }
+
+
+    if (ch === 'x') {
+      // base 16
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isHexCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
+    }
+
+
+    if (ch === 'o') {
+      // base 8
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isOctCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits && ch !== '_';
+    }
+  }
+
+  // base 10 (except 0)
+
+  // value should not start with `_`;
+  if (ch === '_') return false;
+
+  for (; index < max; index++) {
+    ch = data[index];
+    if (ch === '_') continue;
+    if (!isDecCode(data.charCodeAt(index))) {
+      return false;
+    }
+    hasDigits = true;
+  }
+
+  // Should have digits and should not end with `_`
+  if (!hasDigits || ch === '_') return false;
+
+  return true;
+}
+
+function constructYamlInteger(data) {
+  var value = data, sign = 1, ch;
+
+  if (value.indexOf('_') !== -1) {
+    value = value.replace(/_/g, '');
+  }
+
+  ch = value[0];
+
+  if (ch === '-' || ch === '+') {
+    if (ch === '-') sign = -1;
+    value = value.slice(1);
+    ch = value[0];
+  }
+
+  if (value === '0') return 0;
+
+  if (ch === '0') {
+    if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+    if (value[1] === 'x') return sign * parseInt(value.slice(2), 16);
+    if (value[1] === 'o') return sign * parseInt(value.slice(2), 8);
+  }
+
+  return sign * parseInt(value, 10);
+}
+
+function isInteger(object) {
+  return (Object.prototype.toString.call(object)) === '[object Number]' &&
+         (object % 1 === 0 && !common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:int', {
+  kind: 'scalar',
+  resolve: resolveYamlInteger,
+  construct: constructYamlInteger,
+  predicate: isInteger,
+  represent: {
+    binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
+    octal:       function (obj) { return obj >= 0 ? '0o'  + obj.toString(8) : '-0o'  + obj.toString(8).slice(1); },
+    decimal:     function (obj) { return obj.toString(10); },
+    /* eslint-disable max-len */
+    hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
+  },
+  defaultStyle: 'decimal',
+  styleAliases: {
+    binary:      [ 2,  'bin' ],
+    octal:       [ 8,  'oct' ],
+    decimal:     [ 10, 'dec' ],
+    hexadecimal: [ 16, 'hex' ]
+  }
+});
diff --git a/node_modules/js-yaml/lib/type/map.js b/node_modules/js-yaml/lib/type/map.js
new file mode 100644
index 0000000..f327bee
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/map.js
@@ -0,0 +1,8 @@
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:map', {
+  kind: 'mapping',
+  construct: function (data) { return data !== null ? data : {}; }
+});
diff --git a/node_modules/js-yaml/lib/type/merge.js b/node_modules/js-yaml/lib/type/merge.js
new file mode 100644
index 0000000..ae08a86
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/merge.js
@@ -0,0 +1,12 @@
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlMerge(data) {
+  return data === '<<' || data === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:merge', {
+  kind: 'scalar',
+  resolve: resolveYamlMerge
+});
diff --git a/node_modules/js-yaml/lib/type/null.js b/node_modules/js-yaml/lib/type/null.js
new file mode 100644
index 0000000..315ca4e
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/null.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlNull(data) {
+  if (data === null) return true;
+
+  var max = data.length;
+
+  return (max === 1 && data === '~') ||
+         (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
+}
+
+function constructYamlNull() {
+  return null;
+}
+
+function isNull(object) {
+  return object === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:null', {
+  kind: 'scalar',
+  resolve: resolveYamlNull,
+  construct: constructYamlNull,
+  predicate: isNull,
+  represent: {
+    canonical: function () { return '~';    },
+    lowercase: function () { return 'null'; },
+    uppercase: function () { return 'NULL'; },
+    camelcase: function () { return 'Null'; },
+    empty:     function () { return '';     }
+  },
+  defaultStyle: 'lowercase'
+});
diff --git a/node_modules/js-yaml/lib/type/omap.js b/node_modules/js-yaml/lib/type/omap.js
new file mode 100644
index 0000000..b2b5323
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/omap.js
@@ -0,0 +1,44 @@
+'use strict';
+
+var Type = require('../type');
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+var _toString       = Object.prototype.toString;
+
+function resolveYamlOmap(data) {
+  if (data === null) return true;
+
+  var objectKeys = [], index, length, pair, pairKey, pairHasKey,
+      object = data;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+    pairHasKey = false;
+
+    if (_toString.call(pair) !== '[object Object]') return false;
+
+    for (pairKey in pair) {
+      if (_hasOwnProperty.call(pair, pairKey)) {
+        if (!pairHasKey) pairHasKey = true;
+        else return false;
+      }
+    }
+
+    if (!pairHasKey) return false;
+
+    if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
+    else return false;
+  }
+
+  return true;
+}
+
+function constructYamlOmap(data) {
+  return data !== null ? data : [];
+}
+
+module.exports = new Type('tag:yaml.org,2002:omap', {
+  kind: 'sequence',
+  resolve: resolveYamlOmap,
+  construct: constructYamlOmap
+});
diff --git a/node_modules/js-yaml/lib/type/pairs.js b/node_modules/js-yaml/lib/type/pairs.js
new file mode 100644
index 0000000..74b5240
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/pairs.js
@@ -0,0 +1,53 @@
+'use strict';
+
+var Type = require('../type');
+
+var _toString = Object.prototype.toString;
+
+function resolveYamlPairs(data) {
+  if (data === null) return true;
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    if (_toString.call(pair) !== '[object Object]') return false;
+
+    keys = Object.keys(pair);
+
+    if (keys.length !== 1) return false;
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return true;
+}
+
+function constructYamlPairs(data) {
+  if (data === null) return [];
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    keys = Object.keys(pair);
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return result;
+}
+
+module.exports = new Type('tag:yaml.org,2002:pairs', {
+  kind: 'sequence',
+  resolve: resolveYamlPairs,
+  construct: constructYamlPairs
+});
diff --git a/node_modules/js-yaml/lib/type/seq.js b/node_modules/js-yaml/lib/type/seq.js
new file mode 100644
index 0000000..be8f77f
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/seq.js
@@ -0,0 +1,8 @@
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:seq', {
+  kind: 'sequence',
+  construct: function (data) { return data !== null ? data : []; }
+});
diff --git a/node_modules/js-yaml/lib/type/set.js b/node_modules/js-yaml/lib/type/set.js
new file mode 100644
index 0000000..f885a32
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/set.js
@@ -0,0 +1,29 @@
+'use strict';
+
+var Type = require('../type');
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function resolveYamlSet(data) {
+  if (data === null) return true;
+
+  var key, object = data;
+
+  for (key in object) {
+    if (_hasOwnProperty.call(object, key)) {
+      if (object[key] !== null) return false;
+    }
+  }
+
+  return true;
+}
+
+function constructYamlSet(data) {
+  return data !== null ? data : {};
+}
+
+module.exports = new Type('tag:yaml.org,2002:set', {
+  kind: 'mapping',
+  resolve: resolveYamlSet,
+  construct: constructYamlSet
+});
diff --git a/node_modules/js-yaml/lib/type/str.js b/node_modules/js-yaml/lib/type/str.js
new file mode 100644
index 0000000..27acc10
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/str.js
@@ -0,0 +1,8 @@
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:str', {
+  kind: 'scalar',
+  construct: function (data) { return data !== null ? data : ''; }
+});
diff --git a/node_modules/js-yaml/lib/type/timestamp.js b/node_modules/js-yaml/lib/type/timestamp.js
new file mode 100644
index 0000000..8fa9c58
--- /dev/null
+++ b/node_modules/js-yaml/lib/type/timestamp.js
@@ -0,0 +1,88 @@
+'use strict';
+
+var Type = require('../type');
+
+var YAML_DATE_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9])'                    + // [2] month
+  '-([0-9][0-9])$');                   // [3] day
+
+var YAML_TIMESTAMP_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9]?)'                   + // [2] month
+  '-([0-9][0-9]?)'                   + // [3] day
+  '(?:[Tt]|[ \\t]+)'                 + // ...
+  '([0-9][0-9]?)'                    + // [4] hour
+  ':([0-9][0-9])'                    + // [5] minute
+  ':([0-9][0-9])'                    + // [6] second
+  '(?:\\.([0-9]*))?'                 + // [7] fraction
+  '(?:[ \\t]*(Z|([-+])([0-9][0-9]?)' + // [8] tz [9] tz_sign [10] tz_hour
+  '(?::([0-9][0-9]))?))?$');           // [11] tz_minute
+
+function resolveYamlTimestamp(data) {
+  if (data === null) return false;
+  if (YAML_DATE_REGEXP.exec(data) !== null) return true;
+  if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
+  return false;
+}
+
+function constructYamlTimestamp(data) {
+  var match, year, month, day, hour, minute, second, fraction = 0,
+      delta = null, tz_hour, tz_minute, date;
+
+  match = YAML_DATE_REGEXP.exec(data);
+  if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
+
+  if (match === null) throw new Error('Date resolve error');
+
+  // match: [1] year [2] month [3] day
+
+  year = +(match[1]);
+  month = +(match[2]) - 1; // JS month starts with 0
+  day = +(match[3]);
+
+  if (!match[4]) { // no hour
+    return new Date(Date.UTC(year, month, day));
+  }
+
+  // match: [4] hour [5] minute [6] second [7] fraction
+
+  hour = +(match[4]);
+  minute = +(match[5]);
+  second = +(match[6]);
+
+  if (match[7]) {
+    fraction = match[7].slice(0, 3);
+    while (fraction.length < 3) { // milli-seconds
+      fraction += '0';
+    }
+    fraction = +fraction;
+  }
+
+  // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
+
+  if (match[9]) {
+    tz_hour = +(match[10]);
+    tz_minute = +(match[11] || 0);
+    delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
+    if (match[9] === '-') delta = -delta;
+  }
+
+  date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
+
+  if (delta) date.setTime(date.getTime() - delta);
+
+  return date;
+}
+
+function representYamlTimestamp(object /*, style*/) {
+  return object.toISOString();
+}
+
+module.exports = new Type('tag:yaml.org,2002:timestamp', {
+  kind: 'scalar',
+  resolve: resolveYamlTimestamp,
+  construct: constructYamlTimestamp,
+  instanceOf: Date,
+  represent: representYamlTimestamp
+});
diff --git a/node_modules/js-yaml/package.json b/node_modules/js-yaml/package.json
new file mode 100644
index 0000000..17574da
--- /dev/null
+++ b/node_modules/js-yaml/package.json
@@ -0,0 +1,66 @@
+{
+  "name": "js-yaml",
+  "version": "4.1.0",
+  "description": "YAML 1.2 parser and serializer",
+  "keywords": [
+    "yaml",
+    "parser",
+    "serializer",
+    "pyyaml"
+  ],
+  "author": "Vladimir Zapparov <dervus.grim@gmail.com>",
+  "contributors": [
+    "Aleksey V Zapparov <ixti@member.fsf.org> (http://www.ixti.net/)",
+    "Vitaly Puzrin <vitaly@rcdesign.ru> (https://github.com/puzrin)",
+    "Martin Grenfell <martin.grenfell@gmail.com> (http://got-ravings.blogspot.com)"
+  ],
+  "license": "MIT",
+  "repository": "nodeca/js-yaml",
+  "files": [
+    "index.js",
+    "lib/",
+    "bin/",
+    "dist/"
+  ],
+  "bin": {
+    "js-yaml": "bin/js-yaml.js"
+  },
+  "module": "./dist/js-yaml.mjs",
+  "exports": {
+    ".": {
+      "import": "./dist/js-yaml.mjs",
+      "require": "./index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "test": "npm run lint && mocha",
+    "coverage": "npm run lint && nyc mocha && nyc report --reporter html",
+    "demo": "npm run lint && node support/build_demo.js",
+    "gh-demo": "npm run demo && gh-pages -d demo -f",
+    "browserify": "rollup -c support/rollup.config.js",
+    "prepublishOnly": "npm run gh-demo"
+  },
+  "unpkg": "dist/js-yaml.min.js",
+  "jsdelivr": "dist/js-yaml.min.js",
+  "dependencies": {
+    "argparse": "^2.0.1"
+  },
+  "devDependencies": {
+    "@rollup/plugin-commonjs": "^17.0.0",
+    "@rollup/plugin-node-resolve": "^11.0.0",
+    "ansi": "^0.3.1",
+    "benchmark": "^2.1.4",
+    "codemirror": "^5.13.4",
+    "eslint": "^7.0.0",
+    "fast-check": "^2.8.0",
+    "gh-pages": "^3.1.0",
+    "mocha": "^8.2.1",
+    "nyc": "^15.1.0",
+    "rollup": "^2.34.1",
+    "rollup-plugin-node-polyfills": "^0.2.1",
+    "rollup-plugin-terser": "^7.0.2",
+    "shelljs": "^0.8.4"
+  }
+}