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+# bcp-47
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+
+Parse and stringify [BCP 47][spec] language tags.
+
+## Contents
+
+*   [What is this?](#what-is-this)
+*   [When should I use this?](#when-should-i-use-this)
+*   [Install](#install)
+*   [Use](#use)
+*   [API](#api)
+    *   [`parse(tag[, options])`](#parsetag-options)
+    *   [`stringify(schema)`](#stringifyschema)
+    *   [`Schema`](#schema)
+    *   [`function warning(reason, code, offset)`](#function-warningreason-code-offset)
+*   [Types](#types)
+*   [Compatibility](#compatibility)
+*   [Security](#security)
+*   [Related](#related)
+*   [Contribute](#contribute)
+*   [License](#license)
+
+## What is this?
+
+This is a package that can parse BCP 47 language tags to an object representing
+them, and serialize those objects back into language tags.
+It supports a forgiving mode to handle incorrect BCP 47 tags and can emit
+warnings about problems in incorrect tags.
+
+## When should I use this?
+
+You can use this package if you need to access the data stored in BCP 47
+language tags.
+You can also use this package if you want to check (lint) or manipulate tags.
+
+## Install
+
+This package is [ESM only][esm].
+In Node.js (version 12.20+, 14.14+, or 16.0+), install with [npm][]:
+
+```sh
+npm install bcp-47
+```
+
+In Deno with [Skypack][]:
+
+```js
+import * as bcp47 from 'https://cdn.skypack.dev/bcp-47@2?dts'
+```
+
+In browsers with [Skypack][]:
+
+```html
+<script type="module">
+  import * as bcp47 from 'https://cdn.skypack.dev/bcp-47@2?min'
+</script>
+```
+
+## Use
+
+```js
+import {parse, stringify} from 'bcp-47'
+
+const schema = parse('hy-Latn-IT-arevela')
+
+console.log(schema)
+console.log(stringify(schema))
+```
+
+Yields:
+
+```js
+{ language: 'hy',
+  extendedLanguageSubtags: [],
+  script: 'Latn',
+  region: 'IT',
+  variants: ['arevela'],
+  extensions: [],
+  privateuse: [],
+  irregular: null,
+  regular: null }
+'hy-Latn-IT-arevela'
+```
+
+## API
+
+This package exports the following identifiers: `parse` and `stringify`.
+There is no default export.
+
+### `parse(tag[, options])`
+
+Parse a BCP 47 tag into a language schema.
+Note that the algorithm is case insensitive.
+
+###### `options.normalize`
+
+Whether to normalize legacy tags when possible (`boolean`, default:
+`true`).
+For example, `i-klingon` does not match the BCP 47 language algorithm but is
+considered valid by BCP 47 nonetheless.
+It is suggested to use `tlh` instead (the ISO 639-3 code for Klingon).
+When `normalize` is `true`, passing `i-klingon` or other deprecated tags, is
+handled as if their suggested valid tag was given instead.
+
+###### `options.forgiving`
+
+By default, when an error is encountered, an empty object is returned.
+When in forgiving mode, all found values up to the point of the error
+are included (`boolean`, default: `false`).
+So, for example, where by default `en-GB-abcdefghi` an empty object is returned
+(as the language variant is too long), in `forgiving` mode the `language` of
+`schema` is populated with `en` and the `region` is populated with `GB`.
+
+###### `options.warning`
+
+When given, `warning` is called when an error is encountered
+([`Function`][warning]).
+
+###### Returns
+
+Parsed BCP 47 language tag ([`Schema`][schema]).
+
+###### Throws
+
+When `tag` is `null` or `undefined`.
+
+### `stringify(schema)`
+
+Compile a [`schema`][schema] to a BCP 47 language tag.
+
+###### Returns
+
+BCP 47 language tag (`string`).
+
+### `Schema`
+
+A schema represents a language tag.
+A schema is deemed empty when it has neither `language`, `irregular`, `regular`,
+nor `privateuse` (where an empty `privateuse` array is handled as no
+`privateuse` as well).
+
+###### `schema.language`
+
+Two or three character [ISO 639][iso-639] language code, four character reserved
+language code, or 5 to 8 (inclusive) characters registered language subtag
+(`string`).
+For example, `en` (English) or `cmn` (Mandarin Chinese).
+
+###### `schema.extendedLanguageSubtags`
+
+Selected three-character [ISO 639][iso-639] codes(`Array<string>`), such as
+`yue` in `zh-yue-HK` (Chinese, Cantonese, as used in Hong Kong SAR).
+
+###### `schema.script`
+
+Four character [ISO 15924][iso-15924] script code (`string`), such as `Latn` in
+`hy-Latn-IT-arevela` (Eastern Armenian written in Latin script, as used in
+Italy).
+
+###### `schema.region`
+
+Two alphabetical character [ISO 3166-1][iso-3166-1] code or three digit
+[UN M49][un-m49] code (`string`).
+For example, `CN` in `cmn-Hans-CN` (Mandarin Chinese, Simplified script, as used
+in China) or `419` in `es-419` (Spanish as used in Latin America and the
+Caribbean).
+
+###### `schema.variants`
+
+5 to 8 (inclusive) character language variants (`Array<string>`), such as
+`rozaj` and `biske` in `sl-rozaj-biske` (San Giorgio dialect of Resian dialect
+of Slovenian).
+
+###### `schema.extensions`
+
+List of extensions (`Array<Object>`), each an object containing a one character
+`singleton`, and a list of `extensions` (`string`).
+`singleton` cannot be `x` (case insensitive) and `extensions` must be between
+two and eight (inclusive) characters.
+For example, an extension would be `u-co-phonebk` in `de-DE-u-co-phonebk`
+(German, as used in Germany, using German phonebook sort order), where `u` is
+the `singleton` and `co` and `phonebk` are its extensions.
+
+###### `schema.privateuse`
+
+List of private-use subtags (`Array<string>`), where each subtag must be between
+one and eight (inclusive) characters.
+
+###### `schema.regular`
+
+One of the `regular` tags (`string`): tags that are seen as something different
+by the algorithm.
+Valid values are:
+
+*   `art-lojban`
+*   `cel-gaulish`
+*   `no-bok`
+*   `no-nyn`
+*   `zh-guoyu`
+*   `zh-hakka`
+*   `zh-min`
+*   `zh-min-nan`
+*   `zh-xiang`
+
+###### `schema.irregular`
+
+One of the `irregular` tags (`string`): tags that are seen as invalid by the
+algorithm).
+Valid values are:
+
+*   `en-GB-oed`
+*   `i-ami`
+*   `i-bnn`
+*   `i-default`
+*   `i-enochian`
+*   `i-hak`
+*   `i-klingon`
+*   `i-lux`
+*   `i-mingo`
+*   `i-navajo`
+*   `i-pwn`
+*   `i-tao`
+*   `i-tay`
+*   `i-tsu`
+*   `sgn-BE-FR`
+*   `sgn-BE-NL`
+*   `sgn-CH-DE`
+
+### `function warning(reason, code, offset)`
+
+Called when an error occurs.
+
+###### Parameters
+
+*   `reason` (`string`)
+    — English reason for failure
+*   `code` (`number`)
+    — code for failure
+*   `offset` (`number`)
+    — index-based place where the error occurred in the tag
+
+###### Warnings
+
+| code | reason                                                                 |
+| :--- | :--------------------------------------------------------------------- |
+| 1    | Too long variant, expected at most 8 characters                        |
+| 2    | Too long extension, expected at most 8 characters                      |
+| 3    | Too many extended language subtags, expected at most 3 subtags         |
+| 4    | Empty extension, extensions must have at least 2 characters of content |
+| 5    | Too long private-use area, expected at most 8 characters               |
+| 6    | Found superfluous content after tag                                    |
+
+## Types
+
+This package is fully typed with [TypeScript][].
+It exports additional `Schema`, `Extension`, `Warning`, and `Options` types that
+model their respective interfaces.
+
+## Compatibility
+
+This package is at least compatible with all maintained versions of Node.js.
+As of now, that is Node.js 12.20+, 14.14+, and 16.0+.
+It also works in Deno and modern browsers.
+
+## Security
+
+This package is safe.
+
+## Related
+
+*   [`wooorm/bcp-47-match`](https://github.com/wooorm/bcp-47-match)
+    — match BCP 47 language tags with language ranges per RFC 4647
+*   [`wooorm/bcp-47-normalize`](https://github.com/wooorm/bcp-47-normalize)
+    — normalize, canonicalize, and format BCP 47 tags
+*   [`wooorm/iso-3166`](https://github.com/wooorm/iso-3166)
+    — ISO 3166 codes
+*   [`wooorm/iso-639-2`](https://github.com/wooorm/iso-639-2)
+    — ISO 639-2 codes
+*   [`wooorm/iso-639-3`](https://github.com/wooorm/iso-639-3)
+    — ISO 639-3 codes
+*   [`wooorm/iso-15924`](https://github.com/wooorm/iso-15924)
+    — ISO 15924 codes
+*   [`wooorm/un-m49`](https://github.com/wooorm/un-m49)
+    — UN M49 codes
+
+## Contribute
+
+Yes please!
+See [How to Contribute to Open Source][contribute].
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definitions -->
+
+[build-badge]: https://github.com/wooorm/bcp-47/workflows/main/badge.svg
+
+[build]: https://github.com/wooorm/bcp-47/actions
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/wooorm/bcp-47.svg
+
+[coverage]: https://codecov.io/github/wooorm/bcp-47
+
+[downloads-badge]: https://img.shields.io/npm/dm/bcp-47.svg
+
+[downloads]: https://www.npmjs.com/package/bcp-47
+
+[size-badge]: https://img.shields.io/bundlephobia/minzip/bcp-47.svg
+
+[size]: https://bundlephobia.com/result?p=bcp-47
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[skypack]: https://www.skypack.dev
+
+[license]: license
+
+[author]: https://wooorm.com
+
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
+[typescript]: https://www.typescriptlang.org
+
+[contribute]: https://opensource.guide/how-to-contribute/
+
+[spec]: https://tools.ietf.org/rfc/bcp/bcp47.html
+
+[warning]: #function-warningreason-code-offset
+
+[schema]: #schema
+
+[iso-639]: https://en.wikipedia.org/wiki/ISO_639
+
+[iso-15924]: https://en.wikipedia.org/wiki/ISO_15924
+
+[iso-3166-1]: https://en.wikipedia.org/wiki/ISO_3166-1
+
+[un-m49]: https://en.wikipedia.org/wiki/UN_M.49