Changed from static to 11ty!

3 files changed, 7727 insertions, 0 deletions

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=" ... ").length),n-i>l&&(n=i+l-(a=" ...").length),{str:o+e.slice(t,n).replace(/\t/g,"→")+a,pos:i-t+o.length}}function l(e,t){return n.repeat(" ",t-e.length)+e}var c=function(e,t){if(t=Object.create(t||null),!e.buffer)return null;t.maxLength||(t.maxLength=79),"number"!=typeof t.indent&&(t.indent=1),"number"!=typeof t.linesBefore&&(t.linesBefore=3),"number"!=typeof t.linesAfter&&(t.linesAfter=2);for(var i,r=/\r?\n|\r|\0/g,o=[0],c=[],s=-1;i=r.exec(e.buffer);)c.push(i.index),o.push(i.index+i[0].length),e.position<=i.index&&s<0&&(s=o.length-2);s<0&&(s=o.length-1);var u,p,f="",d=Math.min(e.line+t.linesAfter,c.length).toString().length,h=t.maxLength-(t.indent+d+3);for(u=1;u<=t.linesBefore&&!(s-u<0);u++)p=a(e.buffer,o[s-u],c[s-u],e.position-(o[s]-o[s-u]),h),f=n.repeat(" ",t.indent)+l((e.line-u+1).toString(),d)+" | "+p.str+"\n"+f;for(p=a(e.buffer,o[s],c[s],e.position,h),f+=n.repeat(" ",t.indent)+l((e.line+1).toString(),d)+" | "+p.str+"\n",f+=n.repeat("-",t.indent+d+3+p.pos)+"^\n",u=1;u<=t.linesAfter&&!(s+u>=c.length);u++)p=a(e.buffer,o[s+u],c[s+u],e.position-(o[s]-o[s+u]),h),f+=n.repeat(" ",t.indent)+l((e.line+u+1).toString(),d)+" | "+p.str+"\n";return f.replace(/\n$/,"")},s=["kind","multi","resolve","construct","instanceOf","predicate","represent","representName","defaultStyle","styleAliases"],u=["scalar","sequence","mapping"];var p=function(e,t){if(t=t||{},Object.keys(t).forEach((function(t){if(-1===s.indexOf(t))throw new o('Unknown option "'+t+'" is met in definition of "'+e+'" YAML type.')})),this.options=t,this.tag=e,this.kind=t.kind||null,this.resolve=t.resolve||function(){return!0},this.construct=t.construct||function(e){return e},this.instanceOf=t.instanceOf||null,this.predicate=t.predicate||null,this.represent=t.represent||null,this.representName=t.representName||null,this.defaultStyle=t.defaultStyle||null,this.multi=t.multi||!1,this.styleAliases=function(e){var t={};return null!==e&&Object.keys(e).forEach((function(n){e[n].forEach((function(e){t[String(e)]=n}))})),t}(t.styleAliases||null),-1===u.indexOf(this.kind))throw new o('Unknown kind "'+this.kind+'" is specified for "'+e+'" YAML type.')};function f(e,t){var n=[];return e[t].forEach((function(e){var t=n.length;n.forEach((function(n,i){n.tag===e.tag&&n.kind===e.kind&&n.multi===e.multi&&(t=i)})),n[t]=e})),n}function d(e){return this.extend(e)}d.prototype.extend=function(e){var t=[],n=[];if(e instanceof p)n.push(e);else if(Array.isArray(e))n=n.concat(e);else{if(!e||!Array.isArray(e.implicit)&&!Array.isArray(e.explicit))throw new o("Schema.extend argument should be a Type, [ Type ], or a schema definition ({ implicit: [...], explicit: [...] })");e.implicit&&(t=t.concat(e.implicit)),e.explicit&&(n=n.concat(e.explicit))}t.forEach((function(e){if(!(e instanceof p))throw new o("Specified list of YAML types (or a single Type object) contains a non-Type object.");if(e.loadKind&&"scalar"!==e.loadKind)throw new o("There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.");if(e.multi)throw new o("There is a multi type in the implicit list of a schema. Multi tags can only be listed as explicit.")})),n.forEach((function(e){if(!(e instanceof p))throw new o("Specified list of YAML types (or a single Type object) contains a non-Type object.")}));var i=Object.create(d.prototype);return i.implicit=(this.implicit||[]).concat(t),i.explicit=(this.explicit||[]).concat(n),i.compiledImplicit=f(i,"implicit"),i.compiledExplicit=f(i,"explicit"),i.compiledTypeMap=function(){var e,t,n={scalar:{},sequence:{},mapping:{},fallback:{},multi:{scalar:[],sequence:[],mapping:[],fallback:[]}};function i(e){e.multi?(n.multi[e.kind].push(e),n.multi.fallback.push(e)):n[e.kind][e.tag]=n.fallback[e.tag]=e}for(e=0,t=arguments.length;e<t;e+=1)arguments[e].forEach(i);return n}(i.compiledImplicit,i.compiledExplicit),i};var h=d,g=new p("tag:yaml.org,2002:str",{kind:"scalar",construct:function(e){return null!==e?e:""}}),m=new p("tag:yaml.org,2002:seq",{kind:"sequence",construct:function(e){return null!==e?e:[]}}),y=new p("tag:yaml.org,2002:map",{kind:"mapping",construct:function(e){return null!==e?e:{}}}),b=new h({explicit:[g,m,y]});var A=new p("tag:yaml.org,2002:null",{kind:"scalar",resolve:function(e){if(null===e)return!0;var t=e.length;return 1===t&&"~"===e||4===t&&("null"===e||"Null"===e||"NULL"===e)},construct:function(){return null},predicate:function(e){return null===e},represent:{canonical:function(){return"~"},lowercase:function(){return"null"},uppercase:function(){return"NULL"},camelcase:function(){return"Null"},empty:function(){return""}},defaultStyle:"lowercase"});var v=new p("tag:yaml.org,2002:bool",{kind:"scalar",resolve:function(e){if(null===e)return!1;var t=e.length;return 4===t&&("true"===e||"True"===e||"TRUE"===e)||5===t&&("false"===e||"False"===e||"FALSE"===e)},construct:function(e){return"true"===e||"True"===e||"TRUE"===e},predicate:function(e){return"[object Boolean]"===Object.prototype.toString.call(e)},represent:{lowercase:function(e){return e?"true":"false"},uppercase:function(e){return e?"TRUE":"FALSE"},camelcase:function(e){return e?"True":"False"}},defaultStyle:"lowercase"});function w(e){return 48<=e&&e<=55}function k(e){return 48<=e&&e<=57}var C=new p("tag:yaml.org,2002:int",{kind:"scalar",resolve:function(e){if(null===e)return!1;var t,n,i=e.length,r=0,o=!1;if(!i)return!1;if("-"!==(t=e[r])&&"+"!==t||(t=e[++r]),"0"===t){if(r+1===i)return!0;if("b"===(t=e[++r])){for(r++;r<i;r++)if("_"!==(t=e[r])){if("0"!==t&&"1"!==t)return!1;o=!0}return o&&"_"!==t}if("x"===t){for(r++;r<i;r++)if("_"!==(t=e[r])){if(!(48<=(n=e.charCodeAt(r))&&n<=57||65<=n&&n<=70||97<=n&&n<=102))return!1;o=!0}return o&&"_"!==t}if("o"===t){for(r++;r<i;r++)if("_"!==(t=e[r])){if(!w(e.charCodeAt(r)))return!1;o=!0}return o&&"_"!==t}}if("_"===t)return!1;for(;r<i;r++)if("_"!==(t=e[r])){if(!k(e.charCodeAt(r)))return!1;o=!0}return!(!o||"_"===t)},construct:function(e){var 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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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"),l+=e.dump+(e.condenseFlow?'"':"")+":"+(e.condenseFlow?"":" "),Ve(e,t,a,!1,!1)&&(c+=l+=e.dump));e.tag=s,e.dump="{"+c+"}"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else if("[object Array]"===s)i&&0!==e.dump.length?(e.noArrayIndent&&!l&&t>0?$e(e,t-1,e.dump,r):$e(e,t,e.dump,r),f&&(e.dump="&ref_"+p+e.dump)):(!function(e,t,n){var i,r,o,a="",l=e.tag;for(i=0,r=n.length;i<r;i+=1)o=n[i],e.replacer&&(o=e.replacer.call(n,String(i),o)),(Ve(e,t,o,!1,!1)||void 0===o&&Ve(e,t,null,!1,!1))&&(""!==a&&(a+=","+(e.condenseFlow?"":" ")),a+=e.dump);e.tag=l,e.dump="["+a+"]"}(e,t,e.dump),f&&(e.dump="&ref_"+p+" "+e.dump));else{if("[object String]"!==s){if("[object Undefined]"===s)return!1;if(e.skipInvalid)return!1;throw new o("unacceptable kind of an object to dump "+s)}"?"!==e.tag&&Ke(e,e.dump,t,a,u)}null!==e.tag&&"?"!==e.tag&&(c=encodeURI("!"===e.tag[0]?e.tag.slice(1):e.tag).replace(/!/g,"%21"),c="!"===e.tag[0]?"!"+c:"tag:yaml.org,2002:"===c.slice(0,18)?"!!"+c.slice(18):"!<"+c+">",e.dump=c+" "+e.dump)}return!0}function Ze(e,t){var n,i,r=[],o=[];for(Je(e,r,o),n=0,i=o.length;n<i;n+=1)t.duplicates.push(r[o[n]]);t.usedDuplicates=new Array(i)}function Je(e,t,n){var i,r,o;if(null!==e&&"object"==typeof e)if(-1!==(r=t.indexOf(e)))-1===n.indexOf(r)&&n.push(r);else if(t.push(e),Array.isArray(e))for(r=0,o=e.length;r<o;r+=1)Je(e[r],t,n);else for(r=0,o=(i=Object.keys(e)).length;r<o;r+=1)Je(e[i[r]],t,n)}function Qe(e,t){return function(){throw new Error("Function yaml."+e+" is removed in js-yaml 4. 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 };