diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..c6c8b36
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fdefc8c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.DS_Store
+*.log
+.nyc_output/
+coverage/
+node_modules/
+yarn.lock
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..43c97e7
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+package-lock=false
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..404abb2
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+coverage/
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..ec88751
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: node_js
+node_js:
+  - lts/dubnium
+  - node
+after_success: bash <(curl -s https://codecov.io/bash)
diff --git a/build.js b/build.js
new file mode 100644
index 0000000..62eaec9
--- /dev/null
+++ b/build.js
@@ -0,0 +1,160 @@
+'use strict'
+
+var fs = require('fs')
+var path = require('path')
+var fetch = require('node-fetch')
+var fromXml = require('xast-util-from-xml')
+var visit = require('unist-util-visit')
+var normalize = require('bcp-47/lib/normalize')
+
+var own = {}.hasOwnProperty
+
+var endpoint =
+  'https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/supplementalMetadata.xml'
+
+fetch(endpoint)
+  .then(res => res.text())
+  .then(onbody, console.error)
+
+function onbody(doc) {
+  var fields = []
+  var match = []
+  var defaults = []
+  var many = {}
+  var suffix = 'Alias'
+  var seenHeploc = false
+  var ignore = [
+    // Subdivisions (ISO 3166-2) are not used in BCP 47 tags.
+    'subdivision',
+    // Timezones.
+    'zone'
+  ]
+
+  visit(fromXml(doc), 'element', onelement)
+
+  write('defaults', defaults)
+  write('fields', fields)
+  write('many', many)
+  write('matches', match)
+
+  /* eslint-disable-next-line complexity */
+  function onelement(node) {
+    var name = node.name
+    var pos = name.indexOf(suffix)
+    var from
+    var to
+
+    if (name === 'defaultContent') {
+      defaults = defaults.concat(clean(node.attributes.locales))
+    }
+
+    if (pos === -1) {
+      return
+    }
+
+    name = name.slice(0, pos)
+
+    if (name === 'territory') {
+      name = 'region'
+    }
+
+    if (name === 'variant') {
+      name = 'variants'
+    }
+
+    if (ignore.includes(name)) {
+      return
+    }
+
+    from = clean(node.attributes.type)
+    to = clean(node.attributes.replacement)
+
+    if (from.length === 1) {
+      from = from[0]
+    } else {
+      throw new Error('Cannot map from many: ' + from)
+    }
+
+    if (to.length === 1) {
+      to = to[0]
+    } else {
+      if (!many[name]) {
+        many[name] = {}
+      }
+
+      many[name][from] = to
+      return
+    }
+
+    if (name === 'region' && from.length === 3 && isNaN(from)) {
+      console.log(
+        'ISO 3166-1 alpha 3 codes cannot be represented in BCP 47: %s',
+        from
+      )
+      return
+    }
+
+    if (name === 'language') {
+      if (own.call(normalize, from)) {
+        console.warn('Ignoring normalized value: %s -> %s', from, to)
+        return
+      }
+
+      match.push({from, to})
+    } else if (name === 'variants') {
+      if (from === 'aaland' && to === 'ax') {
+        fields.push({
+          from: {field: name, value: from},
+          to: {field: 'region', value: to}
+        })
+      } else if (from === 'heploc' && to === 'alalc97') {
+        if (seenHeploc) {
+          console.warn('Ignoring double heploc alias')
+          return
+        }
+
+        seenHeploc = true
+        fields.push({
+          from: {field: name, value: from},
+          to: {field: name, value: to}
+        })
+      } else if (from === 'polytoni' && to === 'polyton') {
+        fields.push({
+          from: {field: name, value: from},
+          to: {field: name, value: to}
+        })
+      } else if (
+        (from === 'arevela' && to === 'hy') ||
+        (from === 'arevmda' && to === 'hyw')
+      ) {
+        fields.push({
+          from: {field: name, value: from},
+          to: {field: 'language', value: to}
+        })
+      } else {
+        console.warn('Ignoring unknown variant alias', from, to)
+      }
+    } else {
+      fields.push({
+        from: {field: name, value: from},
+        to: {field: name, value: to}
+      })
+    }
+  }
+}
+
+function clean(value) {
+  return value
+    .toLowerCase()
+    .replace(/_/g, '-')
+    .replace(/\s+/g, ' ')
+    .trim()
+    .split(' ')
+}
+
+function write(name, values) {
+  fs.writeFileSync(
+    path.join('lib', name + '.json'),
+    JSON.stringify(values, null, 2) + '\n'
+  )
+}
diff --git a/funding.yml b/funding.yml
new file mode 100644
index 0000000..dee132d
--- /dev/null
+++ b/funding.yml
@@ -0,0 +1 @@
+github: wooorm
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..3541ac5
--- /dev/null
+++ b/index.js
@@ -0,0 +1,3 @@
+'use strict'
+
+module.exports = require('./lib')
diff --git a/lib/defaults.json b/lib/defaults.json
new file mode 100644
index 0000000..6659dfa
--- /dev/null
+++ b/lib/defaults.json
@@ -0,0 +1,308 @@
+[
+  "aa-et",
+  "af-za",
+  "agq-cm",
+  "ak-gh",
+  "am-et",
+  "an-es",
+  "ar-001",
+  "arn-cl",
+  "as-in",
+  "asa-tz",
+  "ast-es",
+  "az-arab-ir",
+  "az-cyrl-az",
+  "az-latn",
+  "az-latn-az",
+  "ba-ru",
+  "bas-cm",
+  "be-by",
+  "bem-zm",
+  "bez-tz",
+  "bg-bg",
+  "bgn-pk",
+  "blt-vn",
+  "bm-ml",
+  "bm-nkoo-ml",
+  "bn-bd",
+  "bo-cn",
+  "br-fr",
+  "brx-in",
+  "bs-cyrl-ba",
+  "bs-latn",
+  "bs-latn-ba",
+  "bss-cm",
+  "byn-er",
+  "ca-es",
+  "cad-us",
+  "cch-ng",
+  "ccp-bd",
+  "ce-ru",
+  "ceb-ph",
+  "cgg-ug",
+  "chr-us",
+  "cic-us",
+  "ckb-iq",
+  "co-fr",
+  "cs-cz",
+  "cu-ru",
+  "cv-ru",
+  "cy-gb",
+  "da-dk",
+  "dav-ke",
+  "de-de",
+  "dje-ne",
+  "dsb-de",
+  "dua-cm",
+  "dv-mv",
+  "dyo-sn",
+  "dz-bt",
+  "ebu-ke",
+  "ee-gh",
+  "el-gr",
+  "en-dsrt-us",
+  "en-us",
+  "eo-001",
+  "es-es",
+  "et-ee",
+  "eu-es",
+  "ewo-cm",
+  "fa-ir",
+  "ff-adlm-gn",
+  "ff-latn",
+  "ff-latn-sn",
+  "fi-fi",
+  "fil-ph",
+  "fo-fo",
+  "fr-fr",
+  "fur-it",
+  "fy-nl",
+  "ga-ie",
+  "gaa-gh",
+  "gd-gb",
+  "gez-et",
+  "gl-es",
+  "gn-py",
+  "gsw-ch",
+  "gu-in",
+  "guz-ke",
+  "gv-im",
+  "ha-arab-ng",
+  "ha-ng",
+  "haw-us",
+  "he-il",
+  "hi-in",
+  "hi-latn-in",
+  "hr-hr",
+  "hsb-de",
+  "hu-hu",
+  "hy-am",
+  "ia-001",
+  "id-id",
+  "ife-tg",
+  "ig-ng",
+  "ii-cn",
+  "io-001",
+  "is-is",
+  "it-it",
+  "iu-ca",
+  "iu-latn-ca",
+  "ja-jp",
+  "jbo-001",
+  "jgo-cm",
+  "jmc-tz",
+  "jv-id",
+  "ka-ge",
+  "kab-dz",
+  "kaj-ng",
+  "kam-ke",
+  "kcg-ng",
+  "kde-tz",
+  "kea-cv",
+  "ken-cm",
+  "khq-ml",
+  "ki-ke",
+  "kk-kz",
+  "kkj-cm",
+  "kl-gl",
+  "kln-ke",
+  "km-kh",
+  "kn-in",
+  "ko-kr",
+  "kok-in",
+  "kpe-lr",
+  "ks-arab",
+  "ks-arab-in",
+  "ks-deva-in",
+  "ksb-tz",
+  "ksf-cm",
+  "ksh-de",
+  "ku-tr",
+  "kw-gb",
+  "ky-kg",
+  "lag-tz",
+  "lb-lu",
+  "lg-ug",
+  "lkt-us",
+  "ln-cd",
+  "lo-la",
+  "lrc-ir",
+  "lt-lt",
+  "lu-cd",
+  "luo-ke",
+  "luy-ke",
+  "lv-lv",
+  "mai-in",
+  "mas-ke",
+  "mer-ke",
+  "mfe-mu",
+  "mg-mg",
+  "mgh-mz",
+  "mgo-cm",
+  "mi-nz",
+  "mk-mk",
+  "ml-in",
+  "mn-mn",
+  "mn-mong-cn",
+  "mni-beng",
+  "mni-beng-in",
+  "mni-mtei-in",
+  "moh-ca",
+  "mr-in",
+  "ms-arab-my",
+  "ms-my",
+  "mt-mt",
+  "mua-cm",
+  "mus-us",
+  "my-mm",
+  "myv-ru",
+  "mzn-ir",
+  "naq-na",
+  "nb-no",
+  "nd-zw",
+  "nds-de",
+  "ne-np",
+  "nl-nl",
+  "nmg-cm",
+  "nn-no",
+  "nnh-cm",
+  "nqo-gn",
+  "nr-za",
+  "nso-za",
+  "nus-ss",
+  "ny-mw",
+  "nyn-ug",
+  "oc-fr",
+  "om-et",
+  "or-in",
+  "os-ge",
+  "osa-us",
+  "pa-arab-pk",
+  "pa-guru",
+  "pa-guru-in",
+  "pcm-ng",
+  "pl-pl",
+  "prg-001",
+  "ps-af",
+  "pt-br",
+  "qu-pe",
+  "quc-gt",
+  "rm-ch",
+  "rn-bi",
+  "ro-ro",
+  "rof-tz",
+  "ru-ru",
+  "rw-rw",
+  "rwk-tz",
+  "sa-in",
+  "sah-ru",
+  "saq-ke",
+  "sat-deva-in",
+  "sat-olck",
+  "sat-olck-in",
+  "sbp-tz",
+  "sc-it",
+  "scn-it",
+  "sd-arab",
+  "sd-arab-pk",
+  "sd-deva-in",
+  "sdh-ir",
+  "se-no",
+  "seh-mz",
+  "ses-ml",
+  "sg-cf",
+  "shi-latn-ma",
+  "shi-tfng",
+  "shi-tfng-ma",
+  "si-lk",
+  "sid-et",
+  "sk-sk",
+  "sl-si",
+  "sma-se",
+  "smj-se",
+  "smn-fi",
+  "sms-fi",
+  "sn-zw",
+  "so-so",
+  "sq-al",
+  "sr-cyrl",
+  "sr-cyrl-rs",
+  "sr-latn-rs",
+  "ss-za",
+  "ssy-er",
+  "st-za",
+  "su-latn",
+  "su-latn-id",
+  "sv-se",
+  "sw-tz",
+  "syr-iq",
+  "szl-pl",
+  "ta-in",
+  "te-in",
+  "teo-ug",
+  "tg-tj",
+  "th-th",
+  "ti-et",
+  "tig-er",
+  "tk-tm",
+  "tn-za",
+  "to-to",
+  "tr-tr",
+  "trv-tw",
+  "ts-za",
+  "tt-ru",
+  "twq-ne",
+  "tzm-ma",
+  "ug-cn",
+  "uk-ua",
+  "ur-pk",
+  "uz-arab-af",
+  "uz-cyrl-uz",
+  "uz-latn",
+  "uz-latn-uz",
+  "vai-latn-lr",
+  "vai-vaii",
+  "vai-vaii-lr",
+  "ve-za",
+  "vi-vn",
+  "vo-001",
+  "vun-tz",
+  "wa-be",
+  "wae-ch",
+  "wal-et",
+  "wbp-au",
+  "wo-sn",
+  "xh-za",
+  "xog-ug",
+  "yav-cm",
+  "yi-001",
+  "yo-ng",
+  "yue-hans-cn",
+  "yue-hant",
+  "yue-hant-hk",
+  "zgh-ma",
+  "zh-hans",
+  "zh-hans-cn",
+  "zh-hant-tw",
+  "zu-za"
+]
diff --git a/lib/fields.json b/lib/fields.json
new file mode 100644
index 0000000..6da8920
--- /dev/null
+++ b/lib/fields.json
@@ -0,0 +1,3232 @@
+[
+  {
+    "from": {
+      "field": "script",
+      "value": "qaai"
+    },
+    "to": {
+      "field": "script",
+      "value": "zinh"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "bu"
+    },
+    "to": {
+      "field": "region",
+      "value": "mm"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "ct"
+    },
+    "to": {
+      "field": "region",
+      "value": "ki"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "dd"
+    },
+    "to": {
+      "field": "region",
+      "value": "de"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "dy"
+    },
+    "to": {
+      "field": "region",
+      "value": "bj"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "fx"
+    },
+    "to": {
+      "field": "region",
+      "value": "fr"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "hv"
+    },
+    "to": {
+      "field": "region",
+      "value": "bf"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "jt"
+    },
+    "to": {
+      "field": "region",
+      "value": "um"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "mi"
+    },
+    "to": {
+      "field": "region",
+      "value": "um"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "nh"
+    },
+    "to": {
+      "field": "region",
+      "value": "vu"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "nq"
+    },
+    "to": {
+      "field": "region",
+      "value": "aq"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "pu"
+    },
+    "to": {
+      "field": "region",
+      "value": "um"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "pz"
+    },
+    "to": {
+      "field": "region",
+      "value": "pa"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "qu"
+    },
+    "to": {
+      "field": "region",
+      "value": "eu"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "rh"
+    },
+    "to": {
+      "field": "region",
+      "value": "zw"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "tp"
+    },
+    "to": {
+      "field": "region",
+      "value": "tl"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "uk"
+    },
+    "to": {
+      "field": "region",
+      "value": "gb"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "vd"
+    },
+    "to": {
+      "field": "region",
+      "value": "vn"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "wk"
+    },
+    "to": {
+      "field": "region",
+      "value": "um"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "yd"
+    },
+    "to": {
+      "field": "region",
+      "value": "ye"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "zr"
+    },
+    "to": {
+      "field": "region",
+      "value": "cd"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "230"
+    },
+    "to": {
+      "field": "region",
+      "value": "et"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "280"
+    },
+    "to": {
+      "field": "region",
+      "value": "de"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "736"
+    },
+    "to": {
+      "field": "region",
+      "value": "sd"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "886"
+    },
+    "to": {
+      "field": "region",
+      "value": "ye"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "958"
+    },
+    "to": {
+      "field": "region",
+      "value": "aa"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "020"
+    },
+    "to": {
+      "field": "region",
+      "value": "ad"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "784"
+    },
+    "to": {
+      "field": "region",
+      "value": "ae"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "004"
+    },
+    "to": {
+      "field": "region",
+      "value": "af"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "028"
+    },
+    "to": {
+      "field": "region",
+      "value": "ag"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "660"
+    },
+    "to": {
+      "field": "region",
+      "value": "ai"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "008"
+    },
+    "to": {
+      "field": "region",
+      "value": "al"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "051"
+    },
+    "to": {
+      "field": "region",
+      "value": "am"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "024"
+    },
+    "to": {
+      "field": "region",
+      "value": "ao"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "010"
+    },
+    "to": {
+      "field": "region",
+      "value": "aq"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "032"
+    },
+    "to": {
+      "field": "region",
+      "value": "ar"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "016"
+    },
+    "to": {
+      "field": "region",
+      "value": "as"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
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+      "value": "sx"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "760"
+    },
+    "to": {
+      "field": "region",
+      "value": "sy"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "748"
+    },
+    "to": {
+      "field": "region",
+      "value": "sz"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "796"
+    },
+    "to": {
+      "field": "region",
+      "value": "tc"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "148"
+    },
+    "to": {
+      "field": "region",
+      "value": "td"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "260"
+    },
+    "to": {
+      "field": "region",
+      "value": "tf"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "768"
+    },
+    "to": {
+      "field": "region",
+      "value": "tg"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "764"
+    },
+    "to": {
+      "field": "region",
+      "value": "th"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "762"
+    },
+    "to": {
+      "field": "region",
+      "value": "tj"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "772"
+    },
+    "to": {
+      "field": "region",
+      "value": "tk"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "626"
+    },
+    "to": {
+      "field": "region",
+      "value": "tl"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "795"
+    },
+    "to": {
+      "field": "region",
+      "value": "tm"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "788"
+    },
+    "to": {
+      "field": "region",
+      "value": "tn"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "776"
+    },
+    "to": {
+      "field": "region",
+      "value": "to"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "792"
+    },
+    "to": {
+      "field": "region",
+      "value": "tr"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "780"
+    },
+    "to": {
+      "field": "region",
+      "value": "tt"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "798"
+    },
+    "to": {
+      "field": "region",
+      "value": "tv"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "158"
+    },
+    "to": {
+      "field": "region",
+      "value": "tw"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "834"
+    },
+    "to": {
+      "field": "region",
+      "value": "tz"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "804"
+    },
+    "to": {
+      "field": "region",
+      "value": "ua"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "800"
+    },
+    "to": {
+      "field": "region",
+      "value": "ug"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "581"
+    },
+    "to": {
+      "field": "region",
+      "value": "um"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "840"
+    },
+    "to": {
+      "field": "region",
+      "value": "us"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "858"
+    },
+    "to": {
+      "field": "region",
+      "value": "uy"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "860"
+    },
+    "to": {
+      "field": "region",
+      "value": "uz"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "336"
+    },
+    "to": {
+      "field": "region",
+      "value": "va"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "670"
+    },
+    "to": {
+      "field": "region",
+      "value": "vc"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "862"
+    },
+    "to": {
+      "field": "region",
+      "value": "ve"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "092"
+    },
+    "to": {
+      "field": "region",
+      "value": "vg"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "850"
+    },
+    "to": {
+      "field": "region",
+      "value": "vi"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "704"
+    },
+    "to": {
+      "field": "region",
+      "value": "vn"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "548"
+    },
+    "to": {
+      "field": "region",
+      "value": "vu"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "876"
+    },
+    "to": {
+      "field": "region",
+      "value": "wf"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "882"
+    },
+    "to": {
+      "field": "region",
+      "value": "ws"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "973"
+    },
+    "to": {
+      "field": "region",
+      "value": "xa"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "974"
+    },
+    "to": {
+      "field": "region",
+      "value": "xb"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "975"
+    },
+    "to": {
+      "field": "region",
+      "value": "xc"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "976"
+    },
+    "to": {
+      "field": "region",
+      "value": "xd"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "977"
+    },
+    "to": {
+      "field": "region",
+      "value": "xe"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "978"
+    },
+    "to": {
+      "field": "region",
+      "value": "xf"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "979"
+    },
+    "to": {
+      "field": "region",
+      "value": "xg"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "980"
+    },
+    "to": {
+      "field": "region",
+      "value": "xh"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "981"
+    },
+    "to": {
+      "field": "region",
+      "value": "xi"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "982"
+    },
+    "to": {
+      "field": "region",
+      "value": "xj"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "983"
+    },
+    "to": {
+      "field": "region",
+      "value": "xk"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "984"
+    },
+    "to": {
+      "field": "region",
+      "value": "xl"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "985"
+    },
+    "to": {
+      "field": "region",
+      "value": "xm"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "986"
+    },
+    "to": {
+      "field": "region",
+      "value": "xn"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "987"
+    },
+    "to": {
+      "field": "region",
+      "value": "xo"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "988"
+    },
+    "to": {
+      "field": "region",
+      "value": "xp"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "989"
+    },
+    "to": {
+      "field": "region",
+      "value": "xq"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "990"
+    },
+    "to": {
+      "field": "region",
+      "value": "xr"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "991"
+    },
+    "to": {
+      "field": "region",
+      "value": "xs"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "992"
+    },
+    "to": {
+      "field": "region",
+      "value": "xt"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "993"
+    },
+    "to": {
+      "field": "region",
+      "value": "xu"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "994"
+    },
+    "to": {
+      "field": "region",
+      "value": "xv"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "995"
+    },
+    "to": {
+      "field": "region",
+      "value": "xw"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "996"
+    },
+    "to": {
+      "field": "region",
+      "value": "xx"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "997"
+    },
+    "to": {
+      "field": "region",
+      "value": "xy"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "998"
+    },
+    "to": {
+      "field": "region",
+      "value": "xz"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "720"
+    },
+    "to": {
+      "field": "region",
+      "value": "ye"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "887"
+    },
+    "to": {
+      "field": "region",
+      "value": "ye"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "175"
+    },
+    "to": {
+      "field": "region",
+      "value": "yt"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "710"
+    },
+    "to": {
+      "field": "region",
+      "value": "za"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "894"
+    },
+    "to": {
+      "field": "region",
+      "value": "zm"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "716"
+    },
+    "to": {
+      "field": "region",
+      "value": "zw"
+    }
+  },
+  {
+    "from": {
+      "field": "region",
+      "value": "999"
+    },
+    "to": {
+      "field": "region",
+      "value": "zz"
+    }
+  },
+  {
+    "from": {
+      "field": "variants",
+      "value": "aaland"
+    },
+    "to": {
+      "field": "region",
+      "value": "ax"
+    }
+  },
+  {
+    "from": {
+      "field": "variants",
+      "value": "polytoni"
+    },
+    "to": {
+      "field": "variants",
+      "value": "polyton"
+    }
+  },
+  {
+    "from": {
+      "field": "variants",
+      "value": "heploc"
+    },
+    "to": {
+      "field": "variants",
+      "value": "alalc97"
+    }
+  },
+  {
+    "from": {
+      "field": "variants",
+      "value": "arevela"
+    },
+    "to": {
+      "field": "language",
+      "value": "hy"
+    }
+  },
+  {
+    "from": {
+      "field": "variants",
+      "value": "arevmda"
+    },
+    "to": {
+      "field": "language",
+      "value": "hyw"
+    }
+  }
+]
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..a1065b5
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,223 @@
+'use strict'
+
+var bcp47 = require('bcp-47')
+var match = require('bcp-47-match')
+var matches = require('./matches.json')
+var fields = require('./fields.json')
+var defaults = require('./defaults.json')
+var many = require('./many.json')
+
+module.exports = normalize
+
+var own = {}.hasOwnProperty
+
+var parse = bcp47.parse
+var stringify = bcp47.stringify
+
+var collator = new Intl.Collator()
+
+function normalize(value, options) {
+  var opts = options || {}
+  var forgiving = opts.forgiving
+  var warning = opts.warning
+  // 1. normalize and lowercase the tag (`sgn-be-fr` -> `sfb`).
+  var schema = parse(String(value || '').toLowerCase(), {forgiving, warning})
+  var tag = stringify(schema)
+  // 2. Do fancy, expensive replaces (`ha-latn-gh` -> `ha-gh`).
+  var length = matches.length
+  var index = -1
+  var d
+
+  if (tag === '') {
+    return tag
+  }
+
+  while (++index < length) {
+    d = matches[index]
+    if (match.extendedFilter(tag, d.from).length !== 0) {
+      replace(schema, d.from, d.to)
+      tag = stringify(schema)
+    }
+  }
+
+  // 3. Do basic field replaces (`en-840` -> `en-us`).
+  length = fields.length
+  index = -1
+
+  while (++index < length) {
+    d = fields[index]
+
+    if (remove(schema, d.from.field, d.from.value)) {
+      add(schema, d.to.field, d.to.value)
+    }
+  }
+
+  // 4. Remove defaults (`nl-nl` -> `nl`).
+  tag = stringify(schema)
+  length = defaults.length
+  index = -1
+
+  while (++index < length) {
+    d = defaults[index]
+
+    if (
+      d === tag ||
+      (tag.charAt(d.length) === '-' && tag.slice(0, d.length) === d)
+    ) {
+      tag = d.slice(0, d.lastIndexOf('-')) + tag.slice(d.length)
+    }
+  }
+
+  // 5. Add proper casing back.
+  schema = parse(tag)
+
+  // 6. Sort extensions on singleton.
+  schema.extensions.sort(compareSingleton)
+
+  // 7. Warn if fields (currently only regions) should be updated but have
+  // multiple choices.
+  if (warning) {
+    for (d in many) {
+      if (own.call(many[d], schema[d])) {
+        warning(
+          'Deprecated ' +
+            d +
+            ' `' +
+            schema[d] +
+            '`, expected one of `' +
+            many[d][schema[d]].join('`, `') +
+            '`',
+          null,
+          7
+        )
+      }
+    }
+  }
+
+  // Format script (ISO 15924) as titlecase (example: `Latn`):
+  if (schema.script !== null) {
+    schema.script =
+      schema.script.charAt(0).toUpperCase() + schema.script.slice(1)
+  }
+
+  // Format region (ISO 3166) as uppercase (note: this doesn’t affect numeric
+  // codes, which is fine):
+  if (schema.region !== null) {
+    schema.region = schema.region.toUpperCase()
+  }
+
+  return stringify(schema)
+}
+
+function replace(schema, from, to) {
+  var left = parse(from)
+  var right = parse(to)
+  var removed = []
+  var key
+
+  // Remove values from `from`:
+  for (key in left) {
+    if (defined(left[key]) && remove(schema, key, left[key])) {
+      removed.push(key)
+    }
+  }
+
+  // Add values from `to`:
+  for (key in right) {
+    // Only add values that are defined on `to`, and that were either removed by
+    // `from` or are currently empty.
+    if (
+      defined(right[key]) &&
+      (removed.indexOf(key) !== -1 || !defined(schema[key]))
+    ) {
+      add(schema, key, right[key])
+    }
+  }
+}
+
+function remove(obj, key, value) {
+  var removed = false
+  var current
+  var result
+  var length
+  var index
+  var val
+
+  /* istanbul ignore else - this is currently done by wrapping code, so else is
+   * never reached.
+   * However, that could change in the future, so leave this guard here. */
+  if (value) {
+    current = obj[key]
+    result = current
+
+    if (array(current)) {
+      result = []
+      length = current.length
+      index = -1
+      while (++index < length) {
+        val = current[index]
+
+        if (value.indexOf(val) === -1) {
+          result.push(val)
+        } else {
+          removed = true
+        }
+      }
+    } else if (current === value) {
+      result = null
+      removed = true
+    }
+
+    obj[key] = result
+  }
+
+  return removed
+}
+
+function add(obj, key, value) {
+  var current = obj[key]
+  var list
+  var length
+  var index
+  var val
+
+  if (array(current)) {
+    list = [].concat(value)
+    length = list.length
+    index = -1
+
+    while (++index < length) {
+      val = list[index]
+
+      /* istanbul ignore else - this currently can’t happen, but guard for the
+       * future. */
+      if (current.indexOf(val) === -1) {
+        current.push(val)
+      }
+    }
+  } else {
+    obj[key] = value
+  }
+}
+
+function defined(value) {
+  return value !== null && value.length !== 0
+}
+
+function array(value) {
+  return value !== null && typeof value === 'object'
+}
+
+function compareSingleton(left, right) {
+  return compare(singleton(left), singleton(right))
+}
+
+function compare(left, right) {
+  /* istanbul ignore next - equality can’t happen in BCP 47 tags, but let’s keep
+   * it in as a guard. */
+  return left === right ? 0 : collator.compare(left, right)
+}
+
+function singleton(value) {
+  return value.singleton
+}
diff --git a/lib/many.json b/lib/many.json
new file mode 100644
index 0000000..51b741c
--- /dev/null
+++ b/lib/many.json
@@ -0,0 +1,157 @@
+{
+  "region": {
+    "172": [
+      "ru",
+      "am",
+      "az",
+      "by",
+      "ge",
+      "kg",
+      "kz",
+      "md",
+      "tj",
+      "tm",
+      "ua",
+      "uz"
+    ],
+    "200": [
+      "cz",
+      "sk"
+    ],
+    "530": [
+      "cw",
+      "sx",
+      "bq"
+    ],
+    "532": [
+      "cw",
+      "sx",
+      "bq"
+    ],
+    "536": [
+      "sa",
+      "iq"
+    ],
+    "582": [
+      "fm",
+      "mh",
+      "mp",
+      "pw"
+    ],
+    "810": [
+      "ru",
+      "am",
+      "az",
+      "by",
+      "ee",
+      "ge",
+      "kz",
+      "kg",
+      "lv",
+      "lt",
+      "md",
+      "tj",
+      "tm",
+      "ua",
+      "uz"
+    ],
+    "830": [
+      "je",
+      "gg"
+    ],
+    "890": [
+      "rs",
+      "me",
+      "si",
+      "hr",
+      "mk",
+      "ba"
+    ],
+    "891": [
+      "rs",
+      "me"
+    ],
+    "an": [
+      "cw",
+      "sx",
+      "bq"
+    ],
+    "cs": [
+      "rs",
+      "me"
+    ],
+    "fq": [
+      "aq",
+      "tf"
+    ],
+    "nt": [
+      "sa",
+      "iq"
+    ],
+    "pc": [
+      "fm",
+      "mh",
+      "mp",
+      "pw"
+    ],
+    "su": [
+      "ru",
+      "am",
+      "az",
+      "by",
+      "ee",
+      "ge",
+      "kz",
+      "kg",
+      "lv",
+      "lt",
+      "md",
+      "tj",
+      "tm",
+      "ua",
+      "uz"
+    ],
+    "yu": [
+      "rs",
+      "me"
+    ],
+    "062": [
+      "034",
+      "143"
+    ],
+    "ant": [
+      "cw",
+      "sx",
+      "bq"
+    ],
+    "scg": [
+      "rs",
+      "me"
+    ],
+    "ntz": [
+      "sa",
+      "iq"
+    ],
+    "sun": [
+      "ru",
+      "am",
+      "az",
+      "by",
+      "ee",
+      "ge",
+      "kz",
+      "kg",
+      "lv",
+      "lt",
+      "md",
+      "tj",
+      "tm",
+      "ua",
+      "uz"
+    ],
+    "yug": [
+      "rs",
+      "me"
+    ]
+  }
+}
diff --git a/lib/matches.json b/lib/matches.json
new file mode 100644
index 0000000..8d69800
--- /dev/null
+++ b/lib/matches.json
@@ -0,0 +1,1582 @@
+[
+  {
+    "from": "in",
+    "to": "id"
+  },
+  {
+    "from": "iw",
+    "to": "he"
+  },
+  {
+    "from": "ji",
+    "to": "yi"
+  },
+  {
+    "from": "jw",
+    "to": "jv"
+  },
+  {
+    "from": "mo",
+    "to": "ro"
+  },
+  {
+    "from": "scc",
+    "to": "sr"
+  },
+  {
+    "from": "scr",
+    "to": "hr"
+  },
+  {
+    "from": "aam",
+    "to": "aas"
+  },
+  {
+    "from": "adp",
+    "to": "dz"
+  },
+  {
+    "from": "aue",
+    "to": "ktz"
+  },
+  {
+    "from": "ayx",
+    "to": "nun"
+  },
+  {
+    "from": "bgm",
+    "to": "bcg"
+  },
+  {
+    "from": "bjd",
+    "to": "drl"
+  },
+  {
+    "from": "ccq",
+    "to": "rki"
+  },
+  {
+    "from": "cjr",
+    "to": "mom"
+  },
+  {
+    "from": "cka",
+    "to": "cmr"
+  },
+  {
+    "from": "cmk",
+    "to": "xch"
+  },
+  {
+    "from": "coy",
+    "to": "pij"
+  },
+  {
+    "from": "cqu",
+    "to": "quh"
+  },
+  {
+    "from": "drh",
+    "to": "mn"
+  },
+  {
+    "from": "drw",
+    "to": "fa-af"
+  },
+  {
+    "from": "gav",
+    "to": "dev"
+  },
+  {
+    "from": "gfx",
+    "to": "vaj"
+  },
+  {
+    "from": "ggn",
+    "to": "gvr"
+  },
+  {
+    "from": "gti",
+    "to": "nyc"
+  },
+  {
+    "from": "guv",
+    "to": "duz"
+  },
+  {
+    "from": "hrr",
+    "to": "jal"
+  },
+  {
+    "from": "ibi",
+    "to": "opa"
+  },
+  {
+    "from": "ilw",
+    "to": "gal"
+  },
+  {
+    "from": "jeg",
+    "to": "oyb"
+  },
+  {
+    "from": "kgc",
+    "to": "tdf"
+  },
+  {
+    "from": "kgh",
+    "to": "kml"
+  },
+  {
+    "from": "koj",
+    "to": "kwv"
+  },
+  {
+    "from": "krm",
+    "to": "bmf"
+  },
+  {
+    "from": "ktr",
+    "to": "dtp"
+  },
+  {
+    "from": "kvs",
+    "to": "gdj"
+  },
+  {
+    "from": "kwq",
+    "to": "yam"
+  },
+  {
+    "from": "kxe",
+    "to": "tvd"
+  },
+  {
+    "from": "kzj",
+    "to": "dtp"
+  },
+  {
+    "from": "kzt",
+    "to": "dtp"
+  },
+  {
+    "from": "lii",
+    "to": "raq"
+  },
+  {
+    "from": "lmm",
+    "to": "rmx"
+  },
+  {
+    "from": "meg",
+    "to": "cir"
+  },
+  {
+    "from": "mst",
+    "to": "mry"
+  },
+  {
+    "from": "mwj",
+    "to": "vaj"
+  },
+  {
+    "from": "myt",
+    "to": "mry"
+  },
+  {
+    "from": "nad",
+    "to": "xny"
+  },
+  {
+    "from": "ncp",
+    "to": "kdz"
+  },
+  {
+    "from": "nnx",
+    "to": "ngv"
+  },
+  {
+    "from": "nts",
+    "to": "pij"
+  },
+  {
+    "from": "oun",
+    "to": "vaj"
+  },
+  {
+    "from": "pcr",
+    "to": "adx"
+  },
+  {
+    "from": "pmc",
+    "to": "huw"
+  },
+  {
+    "from": "pmu",
+    "to": "phr"
+  },
+  {
+    "from": "ppa",
+    "to": "bfy"
+  },
+  {
+    "from": "ppr",
+    "to": "lcq"
+  },
+  {
+    "from": "pry",
+    "to": "prt"
+  },
+  {
+    "from": "puz",
+    "to": "pub"
+  },
+  {
+    "from": "sca",
+    "to": "hle"
+  },
+  {
+    "from": "skk",
+    "to": "oyb"
+  },
+  {
+    "from": "tdu",
+    "to": "dtp"
+  },
+  {
+    "from": "thc",
+    "to": "tpo"
+  },
+  {
+    "from": "thx",
+    "to": "oyb"
+  },
+  {
+    "from": "tie",
+    "to": "ras"
+  },
+  {
+    "from": "tkk",
+    "to": "twm"
+  },
+  {
+    "from": "tlw",
+    "to": "weo"
+  },
+  {
+    "from": "tmp",
+    "to": "tyj"
+  },
+  {
+    "from": "tne",
+    "to": "kak"
+  },
+  {
+    "from": "tnf",
+    "to": "fa-af"
+  },
+  {
+    "from": "tsf",
+    "to": "taj"
+  },
+  {
+    "from": "uok",
+    "to": "ema"
+  },
+  {
+    "from": "xba",
+    "to": "cax"
+  },
+  {
+    "from": "xia",
+    "to": "acn"
+  },
+  {
+    "from": "xkh",
+    "to": "waw"
+  },
+  {
+    "from": "xsj",
+    "to": "suj"
+  },
+  {
+    "from": "ybd",
+    "to": "rki"
+  },
+  {
+    "from": "yma",
+    "to": "lrr"
+  },
+  {
+    "from": "ymt",
+    "to": "mtm"
+  },
+  {
+    "from": "yos",
+    "to": "zom"
+  },
+  {
+    "from": "yuu",
+    "to": "yug"
+  },
+  {
+    "from": "asd",
+    "to": "snz"
+  },
+  {
+    "from": "dit",
+    "to": "dif"
+  },
+  {
+    "from": "llo",
+    "to": "ngt"
+  },
+  {
+    "from": "myd",
+    "to": "aog"
+  },
+  {
+    "from": "nns",
+    "to": "nbr"
+  },
+  {
+    "from": "no-bokmal",
+    "to": "nb"
+  },
+  {
+    "from": "no-nynorsk",
+    "to": "nn"
+  },
+  {
+    "from": "aa-saaho",
+    "to": "ssy"
+  },
+  {
+    "from": "sh",
+    "to": "sr-latn"
+  },
+  {
+    "from": "cnr",
+    "to": "sr-me"
+  },
+  {
+    "from": "no",
+    "to": "nb"
+  },
+  {
+    "from": "tl",
+    "to": "fil"
+  },
+  {
+    "from": "az-az",
+    "to": "az-latn-az"
+  },
+  {
+    "from": "bs-ba",
+    "to": "bs-latn-ba"
+  },
+  {
+    "from": "ha-latn-gh",
+    "to": "ha-gh"
+  },
+  {
+    "from": "ha-latn-ne",
+    "to": "ha-ne"
+  },
+  {
+    "from": "ha-latn-ng",
+    "to": "ha-ng"
+  },
+  {
+    "from": "kk-cyrl-kz",
+    "to": "kk-kz"
+  },
+  {
+    "from": "ky-cyrl-kg",
+    "to": "ky-kg"
+  },
+  {
+    "from": "ks-arab-in",
+    "to": "ks-in"
+  },
+  {
+    "from": "mn-cyrl-mn",
+    "to": "mn-mn"
+  },
+  {
+    "from": "ms-latn-bn",
+    "to": "ms-bn"
+  },
+  {
+    "from": "ms-latn-my",
+    "to": "ms-my"
+  },
+  {
+    "from": "ms-latn-sg",
+    "to": "ms-sg"
+  },
+  {
+    "from": "pa-in",
+    "to": "pa-guru-in"
+  },
+  {
+    "from": "pa-pk",
+    "to": "pa-arab-pk"
+  },
+  {
+    "from": "shi-ma",
+    "to": "shi-tfng-ma"
+  },
+  {
+    "from": "sr-ba",
+    "to": "sr-cyrl-ba"
+  },
+  {
+    "from": "sr-me",
+    "to": "sr-latn-me"
+  },
+  {
+    "from": "sr-rs",
+    "to": "sr-cyrl-rs"
+  },
+  {
+    "from": "sr-xk",
+    "to": "sr-cyrl-xk"
+  },
+  {
+    "from": "tzm-latn-ma",
+    "to": "tzm-ma"
+  },
+  {
+    "from": "ug-arab-cn",
+    "to": "ug-cn"
+  },
+  {
+    "from": "uz-af",
+    "to": "uz-arab-af"
+  },
+  {
+    "from": "uz-uz",
+    "to": "uz-latn-uz"
+  },
+  {
+    "from": "vai-lr",
+    "to": "vai-vaii-lr"
+  },
+  {
+    "from": "yue-cn",
+    "to": "yue-hans-cn"
+  },
+  {
+    "from": "yue-hk",
+    "to": "yue-hant-hk"
+  },
+  {
+    "from": "zh-cn",
+    "to": "zh-hans-cn"
+  },
+  {
+    "from": "zh-hk",
+    "to": "zh-hant-hk"
+  },
+  {
+    "from": "zh-mo",
+    "to": "zh-hant-mo"
+  },
+  {
+    "from": "zh-sg",
+    "to": "zh-hans-sg"
+  },
+  {
+    "from": "zh-tw",
+    "to": "zh-hant-tw"
+  },
+  {
+    "from": "aju",
+    "to": "jrb"
+  },
+  {
+    "from": "als",
+    "to": "sq"
+  },
+  {
+    "from": "arb",
+    "to": "ar"
+  },
+  {
+    "from": "ayr",
+    "to": "ay"
+  },
+  {
+    "from": "azj",
+    "to": "az"
+  },
+  {
+    "from": "bcc",
+    "to": "bal"
+  },
+  {
+    "from": "bcl",
+    "to": "bik"
+  },
+  {
+    "from": "bxk",
+    "to": "luy"
+  },
+  {
+    "from": "bxr",
+    "to": "bua"
+  },
+  {
+    "from": "cld",
+    "to": "syr"
+  },
+  {
+    "from": "cmn",
+    "to": "zh"
+  },
+  {
+    "from": "cwd",
+    "to": "cr"
+  },
+  {
+    "from": "dgo",
+    "to": "doi"
+  },
+  {
+    "from": "dhd",
+    "to": "mwr"
+  },
+  {
+    "from": "dik",
+    "to": "din"
+  },
+  {
+    "from": "diq",
+    "to": "zza"
+  },
+  {
+    "from": "lbk",
+    "to": "bnc"
+  },
+  {
+    "from": "ekk",
+    "to": "et"
+  },
+  {
+    "from": "emk",
+    "to": "man"
+  },
+  {
+    "from": "esk",
+    "to": "ik"
+  },
+  {
+    "from": "fat",
+    "to": "ak"
+  },
+  {
+    "from": "fuc",
+    "to": "ff"
+  },
+  {
+    "from": "gaz",
+    "to": "om"
+  },
+  {
+    "from": "gbo",
+    "to": "grb"
+  },
+  {
+    "from": "gno",
+    "to": "gon"
+  },
+  {
+    "from": "gug",
+    "to": "gn"
+  },
+  {
+    "from": "gya",
+    "to": "gba"
+  },
+  {
+    "from": "hdn",
+    "to": "hai"
+  },
+  {
+    "from": "hea",
+    "to": "hmn"
+  },
+  {
+    "from": "ike",
+    "to": "iu"
+  },
+  {
+    "from": "kmr",
+    "to": "ku"
+  },
+  {
+    "from": "knc",
+    "to": "kr"
+  },
+  {
+    "from": "kng",
+    "to": "kg"
+  },
+  {
+    "from": "knn",
+    "to": "kok"
+  },
+  {
+    "from": "kpv",
+    "to": "kv"
+  },
+  {
+    "from": "lvs",
+    "to": "lv"
+  },
+  {
+    "from": "mhr",
+    "to": "chm"
+  },
+  {
+    "from": "mup",
+    "to": "raj"
+  },
+  {
+    "from": "khk",
+    "to": "mn"
+  },
+  {
+    "from": "npi",
+    "to": "ne"
+  },
+  {
+    "from": "ojg",
+    "to": "oj"
+  },
+  {
+    "from": "ory",
+    "to": "or"
+  },
+  {
+    "from": "pbu",
+    "to": "ps"
+  },
+  {
+    "from": "pes",
+    "to": "fa"
+  },
+  {
+    "from": "plt",
+    "to": "mg"
+  },
+  {
+    "from": "pnb",
+    "to": "lah"
+  },
+  {
+    "from": "quz",
+    "to": "qu"
+  },
+  {
+    "from": "rmy",
+    "to": "rom"
+  },
+  {
+    "from": "spy",
+    "to": "kln"
+  },
+  {
+    "from": "src",
+    "to": "sc"
+  },
+  {
+    "from": "swh",
+    "to": "sw"
+  },
+  {
+    "from": "ttq",
+    "to": "tmh"
+  },
+  {
+    "from": "tw",
+    "to": "ak"
+  },
+  {
+    "from": "umu",
+    "to": "del"
+  },
+  {
+    "from": "uzn",
+    "to": "uz"
+  },
+  {
+    "from": "xpe",
+    "to": "kpe"
+  },
+  {
+    "from": "xsl",
+    "to": "den"
+  },
+  {
+    "from": "ydd",
+    "to": "yi"
+  },
+  {
+    "from": "zai",
+    "to": "zap"
+  },
+  {
+    "from": "zsm",
+    "to": "ms"
+  },
+  {
+    "from": "zyb",
+    "to": "za"
+  },
+  {
+    "from": "him",
+    "to": "srx"
+  },
+  {
+    "from": "mnk",
+    "to": "man"
+  },
+  {
+    "from": "bh",
+    "to": "bho"
+  },
+  {
+    "from": "prs",
+    "to": "fa-af"
+  },
+  {
+    "from": "swc",
+    "to": "sw-cd"
+  },
+  {
+    "from": "aar",
+    "to": "aa"
+  },
+  {
+    "from": "abk",
+    "to": "ab"
+  },
+  {
+    "from": "ave",
+    "to": "ae"
+  },
+  {
+    "from": "afr",
+    "to": "af"
+  },
+  {
+    "from": "aka",
+    "to": "ak"
+  },
+  {
+    "from": "amh",
+    "to": "am"
+  },
+  {
+    "from": "arg",
+    "to": "an"
+  },
+  {
+    "from": "ara",
+    "to": "ar"
+  },
+  {
+    "from": "asm",
+    "to": "as"
+  },
+  {
+    "from": "ava",
+    "to": "av"
+  },
+  {
+    "from": "aym",
+    "to": "ay"
+  },
+  {
+    "from": "aze",
+    "to": "az"
+  },
+  {
+    "from": "bak",
+    "to": "ba"
+  },
+  {
+    "from": "bel",
+    "to": "be"
+  },
+  {
+    "from": "bul",
+    "to": "bg"
+  },
+  {
+    "from": "bih",
+    "to": "bho"
+  },
+  {
+    "from": "bis",
+    "to": "bi"
+  },
+  {
+    "from": "bam",
+    "to": "bm"
+  },
+  {
+    "from": "ben",
+    "to": "bn"
+  },
+  {
+    "from": "bod",
+    "to": "bo"
+  },
+  {
+    "from": "bre",
+    "to": "br"
+  },
+  {
+    "from": "bos",
+    "to": "bs"
+  },
+  {
+    "from": "cat",
+    "to": "ca"
+  },
+  {
+    "from": "che",
+    "to": "ce"
+  },
+  {
+    "from": "cha",
+    "to": "ch"
+  },
+  {
+    "from": "cos",
+    "to": "co"
+  },
+  {
+    "from": "cre",
+    "to": "cr"
+  },
+  {
+    "from": "ces",
+    "to": "cs"
+  },
+  {
+    "from": "chu",
+    "to": "cu"
+  },
+  {
+    "from": "chv",
+    "to": "cv"
+  },
+  {
+    "from": "cym",
+    "to": "cy"
+  },
+  {
+    "from": "dan",
+    "to": "da"
+  },
+  {
+    "from": "deu",
+    "to": "de"
+  },
+  {
+    "from": "div",
+    "to": "dv"
+  },
+  {
+    "from": "dzo",
+    "to": "dz"
+  },
+  {
+    "from": "ewe",
+    "to": "ee"
+  },
+  {
+    "from": "ell",
+    "to": "el"
+  },
+  {
+    "from": "eng",
+    "to": "en"
+  },
+  {
+    "from": "epo",
+    "to": "eo"
+  },
+  {
+    "from": "spa",
+    "to": "es"
+  },
+  {
+    "from": "est",
+    "to": "et"
+  },
+  {
+    "from": "eus",
+    "to": "eu"
+  },
+  {
+    "from": "fas",
+    "to": "fa"
+  },
+  {
+    "from": "ful",
+    "to": "ff"
+  },
+  {
+    "from": "fin",
+    "to": "fi"
+  },
+  {
+    "from": "fij",
+    "to": "fj"
+  },
+  {
+    "from": "fao",
+    "to": "fo"
+  },
+  {
+    "from": "fra",
+    "to": "fr"
+  },
+  {
+    "from": "fry",
+    "to": "fy"
+  },
+  {
+    "from": "gle",
+    "to": "ga"
+  },
+  {
+    "from": "gla",
+    "to": "gd"
+  },
+  {
+    "from": "glg",
+    "to": "gl"
+  },
+  {
+    "from": "grn",
+    "to": "gn"
+  },
+  {
+    "from": "guj",
+    "to": "gu"
+  },
+  {
+    "from": "glv",
+    "to": "gv"
+  },
+  {
+    "from": "hau",
+    "to": "ha"
+  },
+  {
+    "from": "heb",
+    "to": "he"
+  },
+  {
+    "from": "hin",
+    "to": "hi"
+  },
+  {
+    "from": "hmo",
+    "to": "ho"
+  },
+  {
+    "from": "hrv",
+    "to": "hr"
+  },
+  {
+    "from": "hat",
+    "to": "ht"
+  },
+  {
+    "from": "hun",
+    "to": "hu"
+  },
+  {
+    "from": "hye",
+    "to": "hy"
+  },
+  {
+    "from": "her",
+    "to": "hz"
+  },
+  {
+    "from": "ina",
+    "to": "ia"
+  },
+  {
+    "from": "ind",
+    "to": "id"
+  },
+  {
+    "from": "ile",
+    "to": "ie"
+  },
+  {
+    "from": "ibo",
+    "to": "ig"
+  },
+  {
+    "from": "iii",
+    "to": "ii"
+  },
+  {
+    "from": "ipk",
+    "to": "ik"
+  },
+  {
+    "from": "ido",
+    "to": "io"
+  },
+  {
+    "from": "isl",
+    "to": "is"
+  },
+  {
+    "from": "ita",
+    "to": "it"
+  },
+  {
+    "from": "iku",
+    "to": "iu"
+  },
+  {
+    "from": "jpn",
+    "to": "ja"
+  },
+  {
+    "from": "jav",
+    "to": "jv"
+  },
+  {
+    "from": "kat",
+    "to": "ka"
+  },
+  {
+    "from": "kon",
+    "to": "kg"
+  },
+  {
+    "from": "kik",
+    "to": "ki"
+  },
+  {
+    "from": "kua",
+    "to": "kj"
+  },
+  {
+    "from": "kaz",
+    "to": "kk"
+  },
+  {
+    "from": "kal",
+    "to": "kl"
+  },
+  {
+    "from": "khm",
+    "to": "km"
+  },
+  {
+    "from": "kan",
+    "to": "kn"
+  },
+  {
+    "from": "kor",
+    "to": "ko"
+  },
+  {
+    "from": "kau",
+    "to": "kr"
+  },
+  {
+    "from": "kas",
+    "to": "ks"
+  },
+  {
+    "from": "kur",
+    "to": "ku"
+  },
+  {
+    "from": "kom",
+    "to": "kv"
+  },
+  {
+    "from": "cor",
+    "to": "kw"
+  },
+  {
+    "from": "kir",
+    "to": "ky"
+  },
+  {
+    "from": "lat",
+    "to": "la"
+  },
+  {
+    "from": "ltz",
+    "to": "lb"
+  },
+  {
+    "from": "lug",
+    "to": "lg"
+  },
+  {
+    "from": "lim",
+    "to": "li"
+  },
+  {
+    "from": "lin",
+    "to": "ln"
+  },
+  {
+    "from": "lao",
+    "to": "lo"
+  },
+  {
+    "from": "lit",
+    "to": "lt"
+  },
+  {
+    "from": "lub",
+    "to": "lu"
+  },
+  {
+    "from": "lav",
+    "to": "lv"
+  },
+  {
+    "from": "mlg",
+    "to": "mg"
+  },
+  {
+    "from": "mah",
+    "to": "mh"
+  },
+  {
+    "from": "mri",
+    "to": "mi"
+  },
+  {
+    "from": "mkd",
+    "to": "mk"
+  },
+  {
+    "from": "mal",
+    "to": "ml"
+  },
+  {
+    "from": "mon",
+    "to": "mn"
+  },
+  {
+    "from": "mol",
+    "to": "ro"
+  },
+  {
+    "from": "mar",
+    "to": "mr"
+  },
+  {
+    "from": "msa",
+    "to": "ms"
+  },
+  {
+    "from": "mlt",
+    "to": "mt"
+  },
+  {
+    "from": "mya",
+    "to": "my"
+  },
+  {
+    "from": "nau",
+    "to": "na"
+  },
+  {
+    "from": "nob",
+    "to": "nb"
+  },
+  {
+    "from": "nde",
+    "to": "nd"
+  },
+  {
+    "from": "nep",
+    "to": "ne"
+  },
+  {
+    "from": "ndo",
+    "to": "ng"
+  },
+  {
+    "from": "nld",
+    "to": "nl"
+  },
+  {
+    "from": "nno",
+    "to": "nn"
+  },
+  {
+    "from": "nor",
+    "to": "nb"
+  },
+  {
+    "from": "nbl",
+    "to": "nr"
+  },
+  {
+    "from": "nav",
+    "to": "nv"
+  },
+  {
+    "from": "nya",
+    "to": "ny"
+  },
+  {
+    "from": "oci",
+    "to": "oc"
+  },
+  {
+    "from": "oji",
+    "to": "oj"
+  },
+  {
+    "from": "orm",
+    "to": "om"
+  },
+  {
+    "from": "ori",
+    "to": "or"
+  },
+  {
+    "from": "oss",
+    "to": "os"
+  },
+  {
+    "from": "pan",
+    "to": "pa"
+  },
+  {
+    "from": "pli",
+    "to": "pi"
+  },
+  {
+    "from": "pol",
+    "to": "pl"
+  },
+  {
+    "from": "pus",
+    "to": "ps"
+  },
+  {
+    "from": "por",
+    "to": "pt"
+  },
+  {
+    "from": "que",
+    "to": "qu"
+  },
+  {
+    "from": "roh",
+    "to": "rm"
+  },
+  {
+    "from": "run",
+    "to": "rn"
+  },
+  {
+    "from": "ron",
+    "to": "ro"
+  },
+  {
+    "from": "rus",
+    "to": "ru"
+  },
+  {
+    "from": "kin",
+    "to": "rw"
+  },
+  {
+    "from": "san",
+    "to": "sa"
+  },
+  {
+    "from": "srd",
+    "to": "sc"
+  },
+  {
+    "from": "snd",
+    "to": "sd"
+  },
+  {
+    "from": "sme",
+    "to": "se"
+  },
+  {
+    "from": "sag",
+    "to": "sg"
+  },
+  {
+    "from": "hbs",
+    "to": "sr-latn"
+  },
+  {
+    "from": "sin",
+    "to": "si"
+  },
+  {
+    "from": "slk",
+    "to": "sk"
+  },
+  {
+    "from": "slv",
+    "to": "sl"
+  },
+  {
+    "from": "smo",
+    "to": "sm"
+  },
+  {
+    "from": "sna",
+    "to": "sn"
+  },
+  {
+    "from": "som",
+    "to": "so"
+  },
+  {
+    "from": "sqi",
+    "to": "sq"
+  },
+  {
+    "from": "srp",
+    "to": "sr"
+  },
+  {
+    "from": "ssw",
+    "to": "ss"
+  },
+  {
+    "from": "sot",
+    "to": "st"
+  },
+  {
+    "from": "sun",
+    "to": "su"
+  },
+  {
+    "from": "swe",
+    "to": "sv"
+  },
+  {
+    "from": "swa",
+    "to": "sw"
+  },
+  {
+    "from": "tam",
+    "to": "ta"
+  },
+  {
+    "from": "tel",
+    "to": "te"
+  },
+  {
+    "from": "tgk",
+    "to": "tg"
+  },
+  {
+    "from": "tha",
+    "to": "th"
+  },
+  {
+    "from": "tir",
+    "to": "ti"
+  },
+  {
+    "from": "tuk",
+    "to": "tk"
+  },
+  {
+    "from": "tgl",
+    "to": "fil"
+  },
+  {
+    "from": "tsn",
+    "to": "tn"
+  },
+  {
+    "from": "ton",
+    "to": "to"
+  },
+  {
+    "from": "tur",
+    "to": "tr"
+  },
+  {
+    "from": "tso",
+    "to": "ts"
+  },
+  {
+    "from": "tat",
+    "to": "tt"
+  },
+  {
+    "from": "twi",
+    "to": "ak"
+  },
+  {
+    "from": "tah",
+    "to": "ty"
+  },
+  {
+    "from": "uig",
+    "to": "ug"
+  },
+  {
+    "from": "ukr",
+    "to": "uk"
+  },
+  {
+    "from": "urd",
+    "to": "ur"
+  },
+  {
+    "from": "uzb",
+    "to": "uz"
+  },
+  {
+    "from": "ven",
+    "to": "ve"
+  },
+  {
+    "from": "vie",
+    "to": "vi"
+  },
+  {
+    "from": "vol",
+    "to": "vo"
+  },
+  {
+    "from": "wln",
+    "to": "wa"
+  },
+  {
+    "from": "wol",
+    "to": "wo"
+  },
+  {
+    "from": "xho",
+    "to": "xh"
+  },
+  {
+    "from": "yid",
+    "to": "yi"
+  },
+  {
+    "from": "yor",
+    "to": "yo"
+  },
+  {
+    "from": "zha",
+    "to": "za"
+  },
+  {
+    "from": "zho",
+    "to": "zh"
+  },
+  {
+    "from": "zul",
+    "to": "zu"
+  },
+  {
+    "from": "alb",
+    "to": "sq"
+  },
+  {
+    "from": "arm",
+    "to": "hy"
+  },
+  {
+    "from": "baq",
+    "to": "eu"
+  },
+  {
+    "from": "bur",
+    "to": "my"
+  },
+  {
+    "from": "chi",
+    "to": "zh"
+  },
+  {
+    "from": "cze",
+    "to": "cs"
+  },
+  {
+    "from": "dut",
+    "to": "nl"
+  },
+  {
+    "from": "fre",
+    "to": "fr"
+  },
+  {
+    "from": "geo",
+    "to": "ka"
+  },
+  {
+    "from": "ger",
+    "to": "de"
+  },
+  {
+    "from": "gre",
+    "to": "el"
+  },
+  {
+    "from": "ice",
+    "to": "is"
+  },
+  {
+    "from": "mac",
+    "to": "mk"
+  },
+  {
+    "from": "mao",
+    "to": "mi"
+  },
+  {
+    "from": "may",
+    "to": "ms"
+  },
+  {
+    "from": "per",
+    "to": "fa"
+  },
+  {
+    "from": "rum",
+    "to": "ro"
+  },
+  {
+    "from": "slo",
+    "to": "sk"
+  },
+  {
+    "from": "tib",
+    "to": "bo"
+  },
+  {
+    "from": "wel",
+    "to": "cy"
+  }
+]
diff --git a/license b/license
new file mode 100644
index 0000000..3937235
--- /dev/null
+++ b/license
@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) 2020 Titus Wormer <tituswormer@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..8569ea8
--- /dev/null
+++ b/package.json
@@ -0,0 +1,82 @@
+{
+  "name": "bcp-47-normalize",
+  "version": "0.0.0",
+  "description": "Normalize, canonicalize, and format BCP 47 tags",
+  "license": "MIT",
+  "keywords": [
+    "bcp",
+    "47",
+    "bcp47",
+    "bcp-47",
+    "language",
+    "region",
+    "script",
+    "tag",
+    "subtag",
+    "format",
+    "pretty",
+    "normal",
+    "canonical"
+  ],
+  "repository": "wooorm/bcp-47-normalize",
+  "bugs": "https://github.com/wooorm/bcp-47-normalize/issues",
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/sponsors/wooorm"
+  },
+  "author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
+  "contributors": [
+    "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
+  ],
+  "files": [
+    "index.js",
+    "lib/"
+  ],
+  "dependencies": {
+    "bcp-47": "^1.0.0",
+    "bcp-47-match": "^1.0.0"
+  },
+  "devDependencies": {
+    "node-fetch": "^2.0.0",
+    "nyc": "^15.0.0",
+    "prettier": "^1.0.0",
+    "remark-cli": "^7.0.0",
+    "remark-preset-wooorm": "^6.0.0",
+    "tape": "^4.0.0",
+    "unist-util-visit": "^2.0.0",
+    "xast-util-from-xml": "^1.0.0",
+    "xo": "^0.26.0"
+  },
+  "scripts": {
+    "format": "remark . -qfo && prettier --write \"**/*.js\" && xo --fix",
+    "test-api": "node test",
+    "test-coverage": "nyc --reporter lcov tape test.js",
+    "test": "npm run format && npm run test-coverage"
+  },
+  "prettier": {
+    "tabWidth": 2,
+    "useTabs": false,
+    "singleQuote": true,
+    "bracketSpacing": false,
+    "semi": false,
+    "trailingComma": "none"
+  },
+  "xo": {
+    "prettier": true,
+    "esnext": false,
+    "rules": {
+      "unicorn/prefer-includes": "off"
+    }
+  },
+  "nyc": {
+    "check-coverage": true,
+    "lines": 100,
+    "functions": 100,
+    "branches": 100
+  },
+  "remarkConfig": {
+    "plugins": [
+      "preset-wooorm"
+    ]
+  }
+}
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..bdcbf80
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,132 @@
+# bcp-47-normalize
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+
+Normalize, canonicalize, and format [BCP 47][spec] tags.
+
+## Install
+
+[npm][]:
+
+```sh
+npm install bcp-47-normalize
+```
+
+## Use
+
+```js
+var normalize = require('bcp-47-normalize')
+
+var tags = [
+  'de-de-1901',
+  'en-gb',
+  'en-us',
+  'en-bu',
+  'hy-arevmda',
+  'nld-nl',
+  'no-nyn',
+  'pt-br',
+  'pt-pt',
+  'zh-hans-cn'
+]
+
+tags.forEach(function(tag) {
+  console.log('%s -> %s', tag, normalize(tag))
+})
+```
+
+Yields:
+
+```txt
+de-de-1901 -> de-1901
+en-gb -> en-GB
+en-us -> en
+en-bu -> en-MM
+hy-arevmda -> hyw
+nld-nl -> nl
+no-nyn -> nn
+pt-br -> pt
+pt-pt -> pt-PT
+zh-hans-cn -> zh-CN
+```
+
+## API
+
+### `normalize(tag[, options])`
+
+Normalize the given BCP 47 tag according to [Unicode CLDR suggestions][alias].
+
+###### `options.forgiving`
+
+Passed to `bcp-47` as [`options.forgiving`][forgiving].
+
+###### `options.warning`
+
+Passed to `bcp-47` as [`options.warning`][warning].
+
+One additional warning is given:
+
+| code | reason                                                     |
+| :--- | :--------------------------------------------------------- |
+| 7    | Deprecated region `CURRENT`, expected one of `SUGGESTIONS` |
+
+This warning is only given if the region cannot be automatically fixed (when
+regions split into multiple regions).
+
+###### Returns
+
+`string` — Normal, canonical, and pretty [BCP 47][spec] tag.
+
+## Related
+
+*   [`bcp-47`](https://github.com/wooorm/bcp-47-match)
+    — Parse and stringify BCP 47 language tags
+*   [`bcp-47-match`](https://github.com/wooorm/bcp-47-match)
+    — Match BCP 47 language tags with language ranges per RFC 4647
+*   [`iso-639-2`](https://github.com/wooorm/iso-639-2)
+    — ISO 639-2 codes
+*   [`iso-639-3`](https://github.com/wooorm/iso-639-3)
+    — ISO 639-3 codes
+*   [`iso-15924`](https://github.com/wooorm/iso-15924)
+    — ISO 15924 codes
+*   [`un-m49`](https://github.com/wooorm/un-m49)
+    — UN M49 codes
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definitions -->
+
+[build-badge]: https://img.shields.io/travis/wooorm/bcp-47-normalize.svg
+
+[build]: https://travis-ci.org/wooorm/bcp-47-normalize
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/wooorm/bcp-47-normalize.svg
+
+[coverage]: https://codecov.io/github/wooorm/bcp-47-normalize
+
+[downloads-badge]: https://img.shields.io/npm/dm/bcp-47-normalize.svg
+
+[downloads]: https://www.npmjs.com/package/bcp-47-normalize
+
+[size-badge]: https://img.shields.io/bundlephobia/minzip/bcp-47-normalize.svg
+
+[size]: https://bundlephobia.com/result?p=bcp-47-normalize
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[license]: license
+
+[author]: https://wooorm.com
+
+[spec]: https://tools.ietf.org/html/bcp47
+
+[alias]: https://github.com/unicode-org/cldr/blob/4b1225ead2ca9bc7a969a271b9931f137040d2bf/common/supplemental/supplementalMetadata.xml#L32
+
+[forgiving]: https://github.com/wooorm/bcp-47#optionsforgiving
+
+[warning]: https://github.com/wooorm/bcp-47#optionswarning
diff --git a/test.js b/test.js
new file mode 100644
index 0000000..d5dc7f4
--- /dev/null
+++ b/test.js
@@ -0,0 +1,268 @@
+'use strict'
+
+var test = require('tape')
+var normalize = require('.')
+
+test('bcp-47-normalize', function(t) {
+  t.test('basic', function(t) {
+    t.equal(normalize(), '', 'should not fail on without a value')
+    t.equal(normalize(''), '', 'should not fail on an empty string')
+    t.equal(normalize('en-us'), 'en', 'should normalize')
+    t.equal(normalize('EN-CYRL-gb'), 'en-Cyrl-GB', 'should fix casing')
+
+    t.equal(
+      normalize('en-gb-abcdefghi'),
+      '',
+      'should return empty if the tag is invalid by default'
+    )
+
+    t.equal(
+      normalize('en-gb-abcdefghi', {forgiving: true}),
+      'en-GB',
+      'should ignore trailing stuff in forgiving mode'
+    )
+
+    t.test('should emit when given a warning function', function(t) {
+      t.plan(1)
+
+      normalize('en-aaa-bbb-ccc-ddd', {warning: warning})
+
+      function warning(reason, code, offset) {
+        t.deepEqual(
+          [reason, code, offset],
+          [
+            'Too many extended language subtags, expected at most 3 subtags',
+            3,
+            14
+          ],
+          'warning'
+        )
+      }
+    })
+
+    t.test('should emit if deprecated tags can’t be fixed', function(t) {
+      t.plan(1)
+
+      normalize('pap-an', {warning: warning})
+
+      function warning(reason, code, offset) {
+        t.deepEqual(
+          [reason, code, offset],
+          ['Deprecated region `an`, expected one of `cw`, `sx`, `bq`', null, 7],
+          'warning'
+        )
+      }
+    })
+
+    t.test('should not emit if there are no deprecated tags', function(t) {
+      var called = false
+
+      t.plan(1)
+
+      normalize('pap-cw', {warning: warning})
+
+      t.equal(called, false, 'warning')
+
+      function warning() {
+        called = true
+      }
+    })
+
+    t.end()
+  })
+
+  t.test('normalize', function(t) {
+    t.equal(
+      normalize('art-lojban'),
+      'jbo',
+      'should normalize a deprecated regular language'
+    )
+
+    t.equal(
+      normalize('i-klingon'),
+      'tlh',
+      'should normalize a deprecated irregular language'
+    )
+
+    t.equal(
+      normalize('in'),
+      'id',
+      'should normalize a deprecated language (two-letter)'
+    )
+
+    t.equal(
+      normalize('krm'),
+      'bmf',
+      'should normalize a deprecated language (three-letter)'
+    )
+
+    t.equal(
+      normalize('no-bokmal'),
+      'nb',
+      'should normalize a deprecated variant'
+    )
+
+    t.equal(normalize('pa-pk'), 'pa-Arab', 'should normalize to add a script')
+
+    t.equal(
+      normalize('ha-latn-gh'),
+      'ha-GH',
+      'should normalize to remove a script'
+    )
+
+    t.equal(normalize('nld'), 'nl', 'should normalize overlong language codes')
+
+    t.equal(normalize('aju'), 'jrb', 'should normalize macrolanguages codes')
+
+    t.equal(normalize('alb'), 'sq', 'should normalize bibliographic codes')
+
+    t.equal(normalize('en-qaai'), 'en-Zinh', 'should normalize scripts')
+
+    t.equal(normalize('en-bu'), 'en-MM', 'should normalize deprecated regions')
+
+    t.equal(normalize('en-784'), 'en-AE', 'should normalize overlong regions')
+
+    t.equal(
+      normalize('sv-aaland'),
+      'sv-AX',
+      'should normalize legacy variants (1)'
+    )
+
+    t.equal(
+      normalize('el-polytoni'),
+      'el-polyton',
+      'should normalize legacy variants (2)'
+    )
+
+    t.equal(
+      normalize('hy-arevela'),
+      'hy',
+      'should normalize legacy variants (3)'
+    )
+
+    t.equal(
+      normalize('hy-arevmda'),
+      'hyw',
+      'should normalize legacy variants (4)'
+    )
+
+    t.equal(
+      normalize('el-polytoni-polyton'),
+      'el-polyton',
+      'should not duplicate new variants (1)'
+    )
+    t.equal(
+      normalize('el-polyton-polytoni'),
+      'el-polyton',
+      'should not duplicate new variants (2)'
+    )
+
+    t.equal(normalize('nl-nl'), 'nl', 'should normalize default regions')
+
+    t.equal(
+      normalize('en-b-warble-a-warble'),
+      'en-a-warble-b-warble',
+      'should canonicalize extension sequences'
+    )
+
+    t.end()
+  })
+
+  t.test('fixtures', function(t) {
+    var fixtures = {
+      afb: 'afb',
+      'ar-afb': 'ar-afb',
+      'art-lojban': 'jbo',
+      ast: 'ast',
+      'az-arab-x-aze-derbend': 'az-Arab-x-aze-derbend',
+      'az-latn': 'az',
+      'cel-gaulish': 'cel-gaulish',
+      'cmn-hans-cn': 'zh-CN',
+      'de-de-1901': 'de-1901',
+      'de-de-x-goethe': 'de-x-goethe',
+      'de-deva': 'de-Deva',
+      'de-deva-de': 'de-Deva-DE',
+      'de-latf-de': 'de-Latf-DE',
+      'de-ch-x-phonebk': 'de-CH-x-phonebk',
+      'de-de-u-co-phonebk': 'de-u-co-phonebk',
+      'de-de': 'de',
+      'de-qaaa': 'de-Qaaa',
+      de: 'de',
+      'eng-840': 'en',
+      'en-840': 'en',
+      'pt-pt': 'pt-PT',
+      'pt-br': 'pt',
+      'az-arab-ir': 'az-Arab',
+      'sl-cyrl-yu-rozaj-solba-1994-b-1234-a-Foobar-x-b-1234-a-Foobar':
+        'sl-Cyrl-YU-rozaj-solba-1994-a-foobar-b-1234-x-b-1234-a-foobar',
+      'en-gb-oed': 'en-GB-oxendict',
+      'en-us-u-islamcal': 'en-u-islamcal',
+      'en-us': 'en',
+      'en-gb': 'en-GB',
+      'en-us-x-twain': 'en-x-twain',
+      'en-a-myext-b-another': 'en-a-myext-b-another',
+      'en-bu': 'en-MM',
+      en: 'en',
+      'es-005': 'es-005',
+      'es-419': 'es-419',
+      'fr-ca': 'fr-CA',
+      fr: 'fr',
+      hak: 'hak',
+      'hy-latn-it-arevela': 'hy-Latn-IT',
+      'i-ami': 'ami',
+      'i-bnn': 'bnn',
+      'i-default': 'i-default',
+      'i-enochian': 'i-enochian',
+      'i-hak': 'hak',
+      'i-klingon': 'tlh',
+      'i-lux': 'lb',
+      'i-mingo': 'i-mingo',
+      'i-navajo': 'nv',
+      'i-pwn': 'pwn',
+      'i-tao': 'tao',
+      'i-tay': 'tay',
+      'i-tsu': 'tsu',
+      ja: 'ja',
+      mas: 'mas',
+      'no-bok': 'nb',
+      'no-nyn': 'nn',
+      'qaa-qaaa-qm-x-southern': 'qaa-Qaaa-QM-x-southern',
+      'sgn-be-fr': 'sfb',
+      'sgn-be-nl': 'vgt',
+      'sgn-ch-de': 'sgg',
+      'sl-it-nedis': 'sl-IT-nedis',
+      'sl-nedis': 'sl-nedis',
+      'sl-rozaj-biske': 'sl-rozaj-biske',
+      'sl-rozaj': 'sl-rozaj',
+      'sr-cyrl': 'sr',
+      'sr-latn-qm': 'sr-Latn-QM',
+      'sr-latn-rs': 'sr-Latn',
+      'sr-latn': 'sr-Latn',
+      'sr-qaaa-rs': 'sr-Qaaa-RS',
+      'x-whatever': 'x-whatever',
+      'yue-hk': 'yue-HK',
+      'zh-cn-a-myext-x-private': 'zh-CN-a-myext-x-private',
+      'zh-hans-cn': 'zh-CN',
+      'zh-hans': 'zh',
+      'zh-hant-hk': 'zh-Hant-HK',
+      'zh-hant': 'zh-Hant',
+      'zh-cmn-hans-cn': 'zh-cmn-Hans-CN',
+      'zh-guoyu': 'zh',
+      'zh-hakka': 'hak',
+      'zh-min-nan': 'nan',
+      'zh-min': 'zh-min',
+      'zh-xiang': 'hsn',
+      'zh-yue-hk': 'zh-yue-Hant-HK',
+      'zh-yue': 'zh-yue'
+    }
+
+    Object.keys(fixtures).forEach(from => {
+      var to = fixtures[from]
+      t.equal(normalize(from), to, '`' + from + '` -> `' + to + '`')
+    })
+
+    t.end()
+  })
+
+  t.end()
+})