Improve code quality and write tests

node_modules/browserslist/index.js

@@ -0,0 +1,996 @@
+var jsReleases = require('node-releases/data/processed/envs.json')
+var agents = require('caniuse-lite/dist/unpacker/agents').agents
+var jsEOL = require('node-releases/data/release-schedule/release-schedule.json')
+var path = require('path')
+var e2c = require('electron-to-chromium/versions')
+
+var BrowserslistError = require('./error')
+var env = require('./node') // Will load browser.js in webpack
+
+var FLOAT_RANGE = /^\d+(\.\d+)?(-\d+(\.\d+)?)*$/
+var YEAR = 365.259641 * 24 * 60 * 60 * 1000
+
+var QUERY_OR = 1
+var QUERY_AND = 2
+
+function isVersionsMatch (versionA, versionB) {
+  return (versionA + '.').indexOf(versionB + '.') === 0
+}
+
+function isEolReleased (name) {
+  var version = name.slice(1)
+  return jsReleases.some(function (i) {
+    return isVersionsMatch(i.version, version)
+  })
+}
+
+function normalize (versions) {
+  return versions.filter(function (version) {
+    return typeof version === 'string'
+  })
+}
+
+function normalizeElectron (version) {
+  var versionToUse = version
+  if (version.split('.').length === 3) {
+    versionToUse = version
+      .split('.')
+      .slice(0, -1)
+      .join('.')
+  }
+  return versionToUse
+}
+
+function nameMapper (name) {
+  return function mapName (version) {
+    return name + ' ' + version
+  }
+}
+
+function getMajor (version) {
+  return parseInt(version.split('.')[0])
+}
+
+function getMajorVersions (released, number) {
+  if (released.length === 0) return []
+  var minimum = getMajor(released[released.length - 1]) - parseInt(number) + 1
+  var selected = []
+  for (var i = released.length - 1; i >= 0; i--) {
+    if (minimum > getMajor(released[i])) break
+    selected.unshift(released[i])
+  }
+  return selected
+}
+
+function uniq (array) {
+  var filtered = []
+  for (var i = 0; i < array.length; i++) {
+    if (filtered.indexOf(array[i]) === -1) filtered.push(array[i])
+  }
+  return filtered
+}
+
+// Helpers
+
+function fillUsage (result, name, data) {
+  for (var i in data) {
+    result[name + ' ' + i] = data[i]
+  }
+}
+
+function generateFilter (sign, version) {
+  version = parseFloat(version)
+  if (sign === '>') {
+    return function (v) {
+      return parseFloat(v) > version
+    }
+  } else if (sign === '>=') {
+    return function (v) {
+      return parseFloat(v) >= version
+    }
+  } else if (sign === '<') {
+    return function (v) {
+      return parseFloat(v) < version
+    }
+  } else {
+    return function (v) {
+      return parseFloat(v) <= version
+    }
+  }
+}
+
+function generateSemverFilter (sign, version) {
+  version = version.split('.').map(parseSimpleInt)
+  version[1] = version[1] || 0
+  version[2] = version[2] || 0
+  if (sign === '>') {
+    return function (v) {
+      v = v.split('.').map(parseSimpleInt)
+      return compareSemver(v, version) > 0
+    }
+  } else if (sign === '>=') {
+    return function (v) {
+      v = v.split('.').map(parseSimpleInt)
+      return compareSemver(v, version) >= 0
+    }
+  } else if (sign === '<') {
+    return function (v) {
+      v = v.split('.').map(parseSimpleInt)
+      return compareSemver(version, v) > 0
+    }
+  } else {
+    return function (v) {
+      v = v.split('.').map(parseSimpleInt)
+      return compareSemver(version, v) >= 0
+    }
+  }
+}
+
+function parseSimpleInt (x) {
+  return parseInt(x)
+}
+
+function compare (a, b) {
+  if (a < b) return -1
+  if (a > b) return +1
+  return 0
+}
+
+function compareSemver (a, b) {
+  return (
+    compare(a[0], b[0]) ||
+    compare(a[1], b[1]) ||
+    compare(a[2], b[2])
+  )
+}
+
+function resolveVersion (data, version) {
+  if (data.versions.indexOf(version) !== -1) {
+    return version
+  } else if (browserslist.versionAliases[data.name][version]) {
+    return browserslist.versionAliases[data.name][version]
+  } else {
+    return false
+  }
+}
+
+function normalizeVersion (data, version, context) {
+  var resolved = resolveVersion(data, version)
+  if (
+    !resolved &&
+    context.mobileToDesktop &&
+    browserslist.desktopNames[data.name]
+  ) {
+    var alias = checkName(browserslist.desktopNames[data.name])
+    resolved = resolveVersion(alias, version)
+  }
+  if (resolved) {
+    return resolved
+  } else if (data.versions.length === 1) {
+    return data.versions[0]
+  } else {
+    return false
+  }
+}
+
+function filterByYear (since) {
+  since = since / 1000
+  return Object.keys(agents).reduce(function (selected, name) {
+    var data = byName(name)
+    if (!data) return selected
+    var versions = Object.keys(data.releaseDate).filter(function (v) {
+      return data.releaseDate[v] >= since
+    })
+    return selected.concat(versions.map(nameMapper(data.name)))
+  }, [])
+}
+
+function byName (name) {
+  name = name.toLowerCase()
+  name = browserslist.aliases[name] || name
+  return browserslist.data[name]
+}
+
+function checkName (name) {
+  var data = byName(name)
+  if (!data) throw new BrowserslistError('Unknown browser ' + name)
+  return data
+}
+
+function unknownQuery (query) {
+  return new BrowserslistError(
+    'Unknown browser query `' + query + '`. ' +
+    'Maybe you are using old Browserslist or made typo in query.'
+  )
+}
+
+function filterAndroid (list, versions) {
+  var released = browserslist.data.android.released
+  var firstEvergreen = 37
+  var last = released[released.length - 1]
+  var diff = last - firstEvergreen - versions // First Android Evergreen
+  if (diff > 0) {
+    return list.slice(-1)
+  } else {
+    return list.slice(diff - 1)
+  }
+}
+
+/**
+ * Resolves queries into a browser list.
+ * @param {string|string[]} queries Queries to combine.
+ * Either an array of queries or a long string of queries.
+ * @param {object} [context] Optional arguments to
+ * the select function in `queries`.
+ * @returns {string[]} A list of browsers
+ */
+function resolve (queries, context) {
+  if (Array.isArray(queries)) {
+    queries = flatten(queries.map(parse))
+  } else {
+    queries = parse(queries)
+  }
+
+  return queries.reduce(function (result, query, index) {
+    var selection = query.queryString
+
+    var isExclude = selection.indexOf('not ') === 0
+    if (isExclude) {
+      if (index === 0) {
+        throw new BrowserslistError(
+          'Write any browsers query (for instance, `defaults`) ' +
+          'before `' + selection + '`')
+      }
+      selection = selection.slice(4)
+    }
+
+    for (var i = 0; i < QUERIES.length; i++) {
+      var type = QUERIES[i]
+      var match = selection.match(type.regexp)
+      if (match) {
+        var args = [context].concat(match.slice(1))
+        var array = type.select.apply(browserslist, args).map(function (j) {
+          var parts = j.split(' ')
+          if (parts[1] === '0') {
+            return parts[0] + ' ' + byName(parts[0]).versions[0]
+          } else {
+            return j
+          }
+        })
+
+        switch (query.type) {
+          case QUERY_AND:
+            if (isExclude) {
+              return result.filter(function (j) {
+                return array.indexOf(j) === -1
+              })
+            } else {
+              return result.filter(function (j) {
+                return array.indexOf(j) !== -1
+              })
+            }
+          case QUERY_OR:
+          default:
+            if (isExclude) {
+              var filter = { }
+              array.forEach(function (j) {
+                filter[j] = true
+              })
+              return result.filter(function (j) {
+                return !filter[j]
+              })
+            }
+            return result.concat(array)
+        }
+      }
+    }
+
+    throw unknownQuery(selection)
+  }, [])
+}
+
+/**
+ * Return array of browsers by selection queries.
+ *
+ * @param {(string|string[])} [queries=browserslist.defaults] Browser queries.
+ * @param {object} [opts] Options.
+ * @param {string} [opts.path="."] Path to processed file.
+ *                                 It will be used to find config files.
+ * @param {string} [opts.env="production"] Processing environment.
+ *                                         It will be used to take right
+ *                                         queries from config file.
+ * @param {string} [opts.config] Path to config file with queries.
+ * @param {object} [opts.stats] Custom browser usage statistics
+ *                              for "> 1% in my stats" query.
+ * @param {boolean} [opts.ignoreUnknownVersions=false] Do not throw on unknown
+ *                                                     version in direct query.
+ * @param {boolean} [opts.dangerousExtend] Disable security checks
+ *                                         for extend query.
+ * @param {boolean} [opts.mobileToDesktop] Alias mobile browsers to the desktop
+ *                                         version when Can I Use doesn't have
+ *                                         data about the specified version.
+ * @returns {string[]} Array with browser names in Can I Use.
+ *
+ * @example
+ * browserslist('IE >= 10, IE 8') //=> ['ie 11', 'ie 10', 'ie 8']
+ */
+function browserslist (queries, opts) {
+  if (typeof opts === 'undefined') opts = { }
+
+  if (typeof opts.path === 'undefined') {
+    opts.path = path.resolve ? path.resolve('.') : '.'
+  }
+
+  if (typeof queries === 'undefined' || queries === null) {
+    var config = browserslist.loadConfig(opts)
+    if (config) {
+      queries = config
+    } else {
+      queries = browserslist.defaults
+    }
+  }
+
+  if (!(typeof queries === 'string' || Array.isArray(queries))) {
+    throw new BrowserslistError(
+      'Browser queries must be an array or string. Got ' + typeof queries + '.')
+  }
+
+  var context = {
+    ignoreUnknownVersions: opts.ignoreUnknownVersions,
+    dangerousExtend: opts.dangerousExtend,
+    mobileToDesktop: opts.mobileToDesktop
+  }
+
+  env.oldDataWarning(browserslist.data)
+  var stats = env.getStat(opts, browserslist.data)
+  if (stats) {
+    context.customUsage = { }
+    for (var browser in stats) {
+      fillUsage(context.customUsage, browser, stats[browser])
+    }
+  }
+
+  var result = resolve(queries, context).sort(function (name1, name2) {
+    name1 = name1.split(' ')
+    name2 = name2.split(' ')
+    if (name1[0] === name2[0]) {
+      if (FLOAT_RANGE.test(name1[1]) && FLOAT_RANGE.test(name2[1])) {
+        return parseFloat(name2[1]) - parseFloat(name1[1])
+      } else {
+        return compare(name2[1], name1[1])
+      }
+    } else {
+      return compare(name1[0], name2[0])
+    }
+  })
+
+  return uniq(result)
+}
+
+function parse (queries) {
+  var qs = []
+  do {
+    queries = doMatch(queries, qs)
+  } while (queries)
+  return qs
+}
+
+function doMatch (string, qs) {
+  var or = /^(?:,\s*|\s+OR\s+)(.*)/i
+  var and = /^\s+AND\s+(.*)/i
+
+  return find(string, function (parsed, n, max) {
+    if (and.test(parsed)) {
+      qs.unshift({ type: QUERY_AND, queryString: parsed.match(and)[1] })
+      return true
+    } else if (or.test(parsed)) {
+      qs.unshift({ type: QUERY_OR, queryString: parsed.match(or)[1] })
+      return true
+    } else if (n === max) {
+      qs.unshift({ type: QUERY_OR, queryString: parsed.trim() })
+      return true
+    }
+    return false
+  })
+}
+
+function find (string, predicate) {
+  for (var n = 1, max = string.length; n <= max; n++) {
+    var parsed = string.substr(-n, n)
+    if (predicate(parsed, n, max)) {
+      return string.slice(0, -n)
+    }
+  }
+  return ''
+}
+
+function flatten (array) {
+  if (!Array.isArray(array)) return [array]
+  return array.reduce(function (a, b) {
+    return a.concat(flatten(b))
+  }, [])
+}
+
+// Will be filled by Can I Use data below
+browserslist.data = { }
+browserslist.usage = {
+  global: { },
+  custom: null
+}
+
+// Default browsers query
+browserslist.defaults = [
+  '> 0.5%',
+  'last 2 versions',
+  'Firefox ESR',
+  'not dead'
+]
+
+// Browser names aliases
+browserslist.aliases = {
+  fx: 'firefox',
+  ff: 'firefox',
+  ios: 'ios_saf',
+  explorer: 'ie',
+  blackberry: 'bb',
+  explorermobile: 'ie_mob',
+  operamini: 'op_mini',
+  operamobile: 'op_mob',
+  chromeandroid: 'and_chr',
+  firefoxandroid: 'and_ff',
+  ucandroid: 'and_uc',
+  qqandroid: 'and_qq'
+}
+
+// Can I Use only provides a few versions for some browsers (e.g. and_chr).
+// Fallback to a similar browser for unknown versions
+browserslist.desktopNames = {
+  and_chr: 'chrome',
+  and_ff: 'firefox',
+  ie_mob: 'ie',
+  op_mob: 'opera'
+}
+
+// Aliases to work with joined versions like `ios_saf 7.0-7.1`
+browserslist.versionAliases = { }
+
+browserslist.clearCaches = env.clearCaches
+browserslist.parseConfig = env.parseConfig
+browserslist.readConfig = env.readConfig
+browserslist.findConfig = env.findConfig
+browserslist.loadConfig = env.loadConfig
+
+/**
+ * Return browsers market coverage.
+ *
+ * @param {string[]} browsers Browsers names in Can I Use.
+ * @param {string|object} [stats="global"] Which statistics should be used.
+ *                                         Country code or custom statistics.
+ *                                         Pass `"my stats"` to load statistics
+ *                                         from Browserslist files.
+ *
+ * @return {number} Total market coverage for all selected browsers.
+ *
+ * @example
+ * browserslist.coverage(browserslist('> 1% in US'), 'US') //=> 83.1
+ */
+browserslist.coverage = function (browsers, stats) {
+  var data
+  if (typeof stats === 'undefined') {
+    data = browserslist.usage.global
+  } else if (stats === 'my stats') {
+    var opts = {}
+    opts.path = path.resolve ? path.resolve('.') : '.'
+    var customStats = env.getStat(opts)
+    if (!customStats) {
+      throw new BrowserslistError('Custom usage statistics was not provided')
+    }
+    data = {}
+    for (var browser in customStats) {
+      fillUsage(data, browser, customStats[browser])
+    }
+  } else if (typeof stats === 'string') {
+    if (stats.length > 2) {
+      stats = stats.toLowerCase()
+    } else {
+      stats = stats.toUpperCase()
+    }
+    env.loadCountry(browserslist.usage, stats)
+    data = browserslist.usage[stats]
+  } else {
+    if ('dataByBrowser' in stats) {
+      stats = stats.dataByBrowser
+    }
+    data = { }
+    for (var name in stats) {
+      for (var version in stats[name]) {
+        data[name + ' ' + version] = stats[name][version]
+      }
+    }
+  }
+
+  return browsers.reduce(function (all, i) {
+    var usage = data[i]
+    if (usage === undefined) {
+      usage = data[i.replace(/ \S+$/, ' 0')]
+    }
+    return all + (usage || 0)
+  }, 0)
+}
+
+var QUERIES = [
+  {
+    regexp: /^last\s+(\d+)\s+major\s+versions?$/i,
+    select: function (context, versions) {
+      return Object.keys(agents).reduce(function (selected, name) {
+        var data = byName(name)
+        if (!data) return selected
+        var list = getMajorVersions(data.released, versions)
+        list = list.map(nameMapper(data.name))
+        if (data.name === 'android') list = filterAndroid(list, versions)
+        return selected.concat(list)
+      }, [])
+    }
+  },
+  {
+    regexp: /^last\s+(\d+)\s+versions?$/i,
+    select: function (context, versions) {
+      return Object.keys(agents).reduce(function (selected, name) {
+        var data = byName(name)
+        if (!data) return selected
+        var list = data.released.slice(-versions)
+        list = list.map(nameMapper(data.name))
+        if (data.name === 'android') list = filterAndroid(list, versions)
+        return selected.concat(list)
+      }, [])
+    }
+  },
+  {
+    regexp: /^last\s+(\d+)\s+electron\s+major\s+versions?$/i,
+    select: function (context, versions) {
+      var validVersions = getMajorVersions(Object.keys(e2c).reverse(), versions)
+      return validVersions.map(function (i) {
+        return 'chrome ' + e2c[i]
+      })
+    }
+  },
+  {
+    regexp: /^last\s+(\d+)\s+(\w+)\s+major\s+versions?$/i,
+    select: function (context, versions, name) {
+      var data = checkName(name)
+      var validVersions = getMajorVersions(data.released, versions)
+      var list = validVersions.map(nameMapper(data.name))
+      if (data.name === 'android') list = filterAndroid(list, versions)
+      return list
+    }
+  },
+  {
+    regexp: /^last\s+(\d+)\s+electron\s+versions?$/i,
+    select: function (context, versions) {
+      return Object.keys(e2c).reverse().slice(-versions).map(function (i) {
+        return 'chrome ' + e2c[i]
+      })
+    }
+  },
+  {
+    regexp: /^last\s+(\d+)\s+(\w+)\s+versions?$/i,
+    select: function (context, versions, name) {
+      var data = checkName(name)
+      var list = data.released.slice(-versions).map(nameMapper(data.name))
+      if (data.name === 'android') list = filterAndroid(list, versions)
+      return list
+    }
+  },
+  {
+    regexp: /^unreleased\s+versions$/i,
+    select: function () {
+      return Object.keys(agents).reduce(function (selected, name) {
+        var data = byName(name)
+        if (!data) return selected
+        var list = data.versions.filter(function (v) {
+          return data.released.indexOf(v) === -1
+        })
+        list = list.map(nameMapper(data.name))
+        return selected.concat(list)
+      }, [])
+    }
+  },
+  {
+    regexp: /^unreleased\s+electron\s+versions?$/i,
+    select: function () {
+      return []
+    }
+  },
+  {
+    regexp: /^unreleased\s+(\w+)\s+versions?$/i,
+    select: function (context, name) {
+      var data = checkName(name)
+      return data.versions.filter(function (v) {
+        return data.released.indexOf(v) === -1
+      }).map(nameMapper(data.name))
+    }
+  },
+  {
+    regexp: /^last\s+(\d*.?\d+)\s+years?$/i,
+    select: function (context, years) {
+      return filterByYear(Date.now() - YEAR * years)
+    }
+  },
+  {
+    regexp: /^since (\d+)(?:-(\d+))?(?:-(\d+))?$/i,
+    select: function (context, year, month, date) {
+      year = parseInt(year)
+      month = parseInt(month || '01') - 1
+      date = parseInt(date || '01')
+      return filterByYear(Date.UTC(year, month, date, 0, 0, 0))
+    }
+  },
+  {
+    regexp: /^(>=?|<=?)\s*(\d*\.?\d+)%$/,
+    select: function (context, sign, popularity) {
+      popularity = parseFloat(popularity)
+      var usage = browserslist.usage.global
+      return Object.keys(usage).reduce(function (result, version) {
+        if (sign === '>') {
+          if (usage[version] > popularity) {
+            result.push(version)
+          }
+        } else if (sign === '<') {
+          if (usage[version] < popularity) {
+            result.push(version)
+          }
+        } else if (sign === '<=') {
+          if (usage[version] <= popularity) {
+            result.push(version)
+          }
+        } else if (usage[version] >= popularity) {
+          result.push(version)
+        }
+        return result
+      }, [])
+    }
+  },
+  {
+    regexp: /^(>=?|<=?)\s*(\d*\.?\d+)%\s+in\s+my\s+stats$/,
+    select: function (context, sign, popularity) {
+      popularity = parseFloat(popularity)
+      if (!context.customUsage) {
+        throw new BrowserslistError('Custom usage statistics was not provided')
+      }
+      var usage = context.customUsage
+      return Object.keys(usage).reduce(function (result, version) {
+        if (sign === '>') {
+          if (usage[version] > popularity) {
+            result.push(version)
+          }
+        } else if (sign === '<') {
+          if (usage[version] < popularity) {
+            result.push(version)
+          }
+        } else if (sign === '<=') {
+          if (usage[version] <= popularity) {
+            result.push(version)
+          }
+        } else if (usage[version] >= popularity) {
+          result.push(version)
+        }
+        return result
+      }, [])
+    }
+  },
+  {
+    regexp: /^(>=?|<=?)\s*(\d*\.?\d+)%\s+in\s+((alt-)?\w\w)$/,
+    select: function (context, sign, popularity, place) {
+      popularity = parseFloat(popularity)
+      if (place.length === 2) {
+        place = place.toUpperCase()
+      } else {
+        place = place.toLowerCase()
+      }
+      env.loadCountry(browserslist.usage, place)
+      var usage = browserslist.usage[place]
+      return Object.keys(usage).reduce(function (result, version) {
+        if (sign === '>') {
+          if (usage[version] > popularity) {
+            result.push(version)
+          }
+        } else if (sign === '<') {
+          if (usage[version] < popularity) {
+            result.push(version)
+          }
+        } else if (sign === '<=') {
+          if (usage[version] <= popularity) {
+            result.push(version)
+          }
+        } else if (usage[version] >= popularity) {
+          result.push(version)
+        }
+        return result
+      }, [])
+    }
+  },
+  {
+    regexp: /^cover\s+(\d*\.?\d+)%(\s+in\s+(my\s+stats|(alt-)?\w\w))?$/,
+    select: function (context, coverage, statMode) {
+      coverage = parseFloat(coverage)
+      var usage = browserslist.usage.global
+      if (statMode) {
+        if (statMode.match(/^\s+in\s+my\s+stats$/)) {
+          if (!context.customUsage) {
+            throw new BrowserslistError(
+              'Custom usage statistics was not provided'
+            )
+          }
+          usage = context.customUsage
+        } else {
+          var match = statMode.match(/\s+in\s+((alt-)?\w\w)/)
+          var place = match[1]
+          if (place.length === 2) {
+            place = place.toUpperCase()
+          } else {
+            place = place.toLowerCase()
+          }
+          env.loadCountry(browserslist.usage, place)
+          usage = browserslist.usage[place]
+        }
+      }
+      var versions = Object.keys(usage).sort(function (a, b) {
+        return usage[b] - usage[a]
+      })
+      var coveraged = 0
+      var result = []
+      var version
+      for (var i = 0; i <= versions.length; i++) {
+        version = versions[i]
+        if (usage[version] === 0) break
+        coveraged += usage[version]
+        result.push(version)
+        if (coveraged >= coverage) break
+      }
+      return result
+    }
+  },
+  {
+    regexp: /^electron\s+([\d.]+)\s*-\s*([\d.]+)$/i,
+    select: function (context, from, to) {
+      var fromToUse = normalizeElectron(from)
+      var toToUse = normalizeElectron(to)
+      if (!e2c[fromToUse]) {
+        throw new BrowserslistError('Unknown version ' + from + ' of electron')
+      }
+      if (!e2c[toToUse]) {
+        throw new BrowserslistError('Unknown version ' + to + ' of electron')
+      }
+      from = parseFloat(from)
+      to = parseFloat(to)
+      return Object.keys(e2c).filter(function (i) {
+        var parsed = parseFloat(i)
+        return parsed >= from && parsed <= to
+      }).map(function (i) {
+        return 'chrome ' + e2c[i]
+      })
+    }
+  },
+  {
+    regexp: /^(\w+)\s+([\d.]+)\s*-\s*([\d.]+)$/i,
+    select: function (context, name, from, to) {
+      var data = checkName(name)
+      from = parseFloat(normalizeVersion(data, from, context) || from)
+      to = parseFloat(normalizeVersion(data, to, context) || to)
+      function filter (v) {
+        var parsed = parseFloat(v)
+        return parsed >= from && parsed <= to
+      }
+      return data.released.filter(filter).map(nameMapper(data.name))
+    }
+  },
+  {
+    regexp: /^electron\s*(>=?|<=?)\s*([\d.]+)$/i,
+    select: function (context, sign, version) {
+      var versionToUse = normalizeElectron(version)
+      return Object.keys(e2c)
+        .filter(generateFilter(sign, versionToUse))
+        .map(function (i) {
+          return 'chrome ' + e2c[i]
+        })
+    }
+  },
+  {
+    regexp: /^node\s*(>=?|<=?)\s*([\d.]+)$/i,
+    select: function (context, sign, version) {
+      var nodeVersions = jsReleases.filter(function (i) {
+        return i.name === 'nodejs'
+      }).map(function (i) {
+        return i.version
+      })
+      return nodeVersions
+        .filter(generateSemverFilter(sign, version))
+        .map(function (v) {
+          return 'node ' + v
+        })
+    }
+  },
+  {
+    regexp: /^(\w+)\s*(>=?|<=?)\s*([\d.]+)$/,
+    select: function (context, name, sign, version) {
+      var data = checkName(name)
+      var alias = browserslist.versionAliases[data.name][version]
+      if (alias) {
+        version = alias
+      }
+      return data.released
+        .filter(generateFilter(sign, version))
+        .map(function (v) {
+          return data.name + ' ' + v
+        })
+    }
+  },
+  {
+    regexp: /^(firefox|ff|fx)\s+esr$/i,
+    select: function () {
+      return ['firefox 68', 'firefox 60']
+    }
+  },
+  {
+    regexp: /(operamini|op_mini)\s+all/i,
+    select: function () {
+      return ['op_mini all']
+    }
+  },
+  {
+    regexp: /^electron\s+([\d.]+)$/i,
+    select: function (context, version) {
+      var versionToUse = normalizeElectron(version)
+      var chrome = e2c[versionToUse]
+      if (!chrome) {
+        throw new BrowserslistError(
+          'Unknown version ' + version + ' of electron')
+      }
+      return ['chrome ' + chrome]
+    }
+  },
+  {
+    regexp: /^node\s+(\d+(\.\d+)?(\.\d+)?)$/i,
+    select: function (context, version) {
+      var nodeReleases = jsReleases.filter(function (i) {
+        return i.name === 'nodejs'
+      })
+      var matched = nodeReleases.filter(function (i) {
+        return isVersionsMatch(i.version, version)
+      })
+      if (matched.length === 0) {
+        if (context.ignoreUnknownVersions) {
+          return []
+        } else {
+          throw new BrowserslistError(
+            'Unknown version ' + version + ' of Node.js')
+        }
+      }
+      return ['node ' + matched[matched.length - 1].version]
+    }
+  },
+  {
+    regexp: /^current\s+node$/i,
+    select: function (context) {
+      return [env.currentNode(resolve, context)]
+    }
+  },
+  {
+    regexp: /^maintained\s+node\s+versions$/i,
+    select: function (context) {
+      var now = Date.now()
+      var queries = Object.keys(jsEOL).filter(function (key) {
+        return now < Date.parse(jsEOL[key].end) &&
+          now > Date.parse(jsEOL[key].start) &&
+          isEolReleased(key)
+      }).map(function (key) {
+        return 'node ' + key.slice(1)
+      })
+      return resolve(queries, context)
+    }
+  },
+  {
+    regexp: /^phantomjs\s+1.9$/i,
+    select: function () {
+      return ['safari 5']
+    }
+  },
+  {
+    regexp: /^phantomjs\s+2.1$/i,
+    select: function () {
+      return ['safari 6']
+    }
+  },
+  {
+    regexp: /^(\w+)\s+(tp|[\d.]+)$/i,
+    select: function (context, name, version) {
+      if (/^tp$/i.test(version)) version = 'TP'
+      var data = checkName(name)
+      var alias = normalizeVersion(data, version, context)
+      if (alias) {
+        version = alias
+      } else {
+        if (version.indexOf('.') === -1) {
+          alias = version + '.0'
+        } else {
+          alias = version.replace(/\.0$/, '')
+        }
+        alias = normalizeVersion(data, alias, context)
+        if (alias) {
+          version = alias
+        } else if (context.ignoreUnknownVersions) {
+          return []
+        } else {
+          throw new BrowserslistError(
+            'Unknown version ' + version + ' of ' + name)
+        }
+      }
+      return [data.name + ' ' + version]
+    }
+  },
+  {
+    regexp: /^extends (.+)$/i,
+    select: function (context, name) {
+      return resolve(env.loadQueries(context, name), context)
+    }
+  },
+  {
+    regexp: /^defaults$/i,
+    select: function () {
+      return browserslist(browserslist.defaults)
+    }
+  },
+  {
+    regexp: /^dead$/i,
+    select: function (context) {
+      var dead = [
+        'ie <= 10', 'ie_mob <= 10',
+        'bb <= 10',
+        'op_mob <= 12.1',
+        'samsung 4'
+      ]
+      return resolve(dead, context)
+    }
+  },
+  {
+    regexp: /^(\w+)$/i,
+    select: function (context, name) {
+      if (byName(name)) {
+        throw new BrowserslistError(
+          'Specify versions in Browserslist query for browser ' + name)
+      } else {
+        throw unknownQuery(name)
+      }
+    }
+  }
+];
+
+// Get and convert Can I Use data
+
+(function () {
+  for (var name in agents) {
+    var browser = agents[name]
+    browserslist.data[name] = {
+      name: name,
+      versions: normalize(agents[name].versions),
+      released: normalize(agents[name].versions.slice(0, -3)),
+      releaseDate: agents[name].release_date
+    }
+    fillUsage(browserslist.usage.global, name, browser.usage_global)
+
+    browserslist.versionAliases[name] = { }
+    for (var i = 0; i < browser.versions.length; i++) {
+      var full = browser.versions[i]
+      if (!full) continue
+
+      if (full.indexOf('-') !== -1) {
+        var interval = full.split('-')
+        for (var j = 0; j < interval.length; j++) {
+          browserslist.versionAliases[name][interval[j]] = full
+        }
+      }
+    }
+  }
+}())
+
+module.exports = browserslist