basant307/AI_Governance_Project

1var feature = require('caniuse-lite/dist/unpacker/feature').default2var region = require('caniuse-lite/dist/unpacker/region').default3var fs = require('fs')4var path = require('path')5 6var BrowserslistError = require('./error')7 8var IS_SECTION = /^\s*\[(.+)]\s*$/9var CONFIG_PATTERN = /^browserslist-config-/10var SCOPED_CONFIG__PATTERN = /@[^/]+(?:\/[^/]+)?\/browserslist-config(?:-|$|\/)/11var FORMAT =12  'Browserslist config should be a string or an array ' +13  'of strings with browser queries'14var PATHTYPE_UNKNOWN = 'unknown'15var PATHTYPE_DIR = 'directory'16var PATHTYPE_FILE = 'file'17 18var dataTimeChecked = false19var statCache = {}20var configPathCache = {}21var parseConfigCache = {}22 23function checkExtend(name) {24  var use = ' Use `dangerousExtend` option to disable.'25  if (!CONFIG_PATTERN.test(name) && !SCOPED_CONFIG__PATTERN.test(name)) {26    throw new BrowserslistError(27      'Browserslist config needs `browserslist-config-` prefix. ' + use28    )29  }30  if (name.replace(/^@[^/]+\//, '').indexOf('.') !== -1) {31    throw new BrowserslistError(32      '`.` not allowed in Browserslist config name. ' + use33    )34  }35  if (name.indexOf('node_modules') !== -1) {36    throw new BrowserslistError(37      '`node_modules` not allowed in Browserslist config.' + use38    )39  }40}41 42function getPathType(filepath) {43  var stats44  try {45    stats = fs.existsSync(filepath) && fs.statSync(filepath)46  } catch (err) {47    /* c8 ignore start */48    if (49      err.code !== 'ENOENT' &&50      err.code !== 'EACCES' &&51      err.code !== 'ERR_ACCESS_DENIED'52    ) {53      throw err54    }55    /* c8 ignore end */56  }57 58  if (stats && stats.isDirectory()) return PATHTYPE_DIR59  if (stats && stats.isFile()) return PATHTYPE_FILE60 61  return PATHTYPE_UNKNOWN62}63 64function isFile(file) {65  return getPathType(file) === PATHTYPE_FILE66}67 68function isDirectory(dir) {69  return getPathType(dir) === PATHTYPE_DIR70}71 72function eachParent(file, callback, cache) {73  var loc = path.resolve(file)74  var pathsForCacheResult = []75  var result76  do {77    if (!pathInRoot(loc)) {78      break79    }80    if (cache && loc in cache) {81      result = cache[loc]82      break83    }84    pathsForCacheResult.push(loc)85 86    if (!isDirectory(loc)) {87      continue88    }89 90    var locResult = callback(loc)91    if (typeof locResult !== 'undefined') {92      result = locResult93      break94    }95  } while (loc !== (loc = path.dirname(loc)))96 97  if (cache && !process.env.BROWSERSLIST_DISABLE_CACHE) {98    pathsForCacheResult.forEach(function (cachePath) {99      cache[cachePath] = result100    })101  }102  return result103}104 105function pathInRoot(p) {106  if (!process.env.BROWSERSLIST_ROOT_PATH) return true107  var rootPath = path.resolve(process.env.BROWSERSLIST_ROOT_PATH)108  if (path.relative(rootPath, p).substring(0, 2) === '..') {109    return false110  }111  return true112}113 114function check(section) {115  if (Array.isArray(section)) {116    for (var i = 0; i < section.length; i++) {117      if (typeof section[i] !== 'string') {118        throw new BrowserslistError(FORMAT)119      }120    }121  } else if (typeof section !== 'string') {122    throw new BrowserslistError(FORMAT)123  }124}125 126function pickEnv(config, opts) {127  if (typeof config !== 'object') return config128 129  var name130  if (typeof opts.env === 'string') {131    name = opts.env132  } else if (process.env.BROWSERSLIST_ENV) {133    name = process.env.BROWSERSLIST_ENV134  } else if (process.env.NODE_ENV) {135    name = process.env.NODE_ENV136  } else {137    name = 'production'138  }139 140  if (opts.throwOnMissing) {141    if (name && name !== 'defaults' && !config[name]) {142      throw new BrowserslistError(143        'Missing config for Browserslist environment `' + name + '`'144      )145    }146  }147 148  return config[name] || config.defaults149}150 151function parsePackage(file) {152  var text = fs153    .readFileSync(file)154    .toString()155    .replace(/^\uFEFF/m, '')156  var list157  if (text.indexOf('"browserslist"') >= 0) {158    list = JSON.parse(text).browserslist159  } else if (text.indexOf('"browserlist"') >= 0) {160    var config = JSON.parse(text)161    if (config.browserlist && !config.browserslist) {162      throw new BrowserslistError(163        '`browserlist` key instead of `browserslist` in ' + file164      )165    }166  }167  if (Array.isArray(list) || typeof list === 'string') {168    list = { defaults: list }169  }170  for (var i in list) {171    check(list[i])172  }173 174  return list175}176 177function parsePackageOrReadConfig(file) {178  if (file in parseConfigCache) {179    return parseConfigCache[file]180  }181 182  var isPackage = path.basename(file) === 'package.json'183  var result = isPackage ? parsePackage(file) : module.exports.readConfig(file)184 185  if (!process.env.BROWSERSLIST_DISABLE_CACHE) {186    parseConfigCache[file] = result187  }188  return result189}190 191function latestReleaseTime(agents) {192  var latest = 0193  for (var name in agents) {194    var dates = agents[name].releaseDate || {}195    for (var key in dates) {196      if (latest < dates[key]) {197        latest = dates[key]198      }199    }200  }201  return latest * 1000202}203 204function getMonthsPassed(date) {205  var now = new Date()206  var past = new Date(date)207 208  var years = now.getFullYear() - past.getFullYear()209  var months = now.getMonth() - past.getMonth()210 211  return years * 12 + months212}213 214function normalizeStats(data, stats) {215  if (!data) {216    data = {}217  }218  if (stats && 'dataByBrowser' in stats) {219    stats = stats.dataByBrowser220  }221 222  if (typeof stats !== 'object') return undefined223 224  var normalized = {}225  for (var i in stats) {226    var versions = Object.keys(stats[i])227    if (versions.length === 1 && data[i] && data[i].versions.length === 1) {228      var normal = data[i].versions[0]229      normalized[i] = {}230      normalized[i][normal] = stats[i][versions[0]]231    } else {232      normalized[i] = stats[i]233    }234  }235 236  return normalized237}238 239function normalizeUsageData(usageData, data) {240  for (var browser in usageData) {241    var browserUsage = usageData[browser]242    // https://github.com/browserslist/browserslist/issues/431#issuecomment-565230615243    // caniuse-db returns { 0: "percentage" } for `and_*` regional stats244    if ('0' in browserUsage) {245      var versions = data[browser].versions246      browserUsage[versions[versions.length - 1]] = browserUsage[0]247      delete browserUsage[0]248    }249  }250}251 252module.exports = {253  loadQueries: function loadQueries(ctx, name) {254    if (!ctx.dangerousExtend && !process.env.BROWSERSLIST_DANGEROUS_EXTEND) {255      checkExtend(name)256    }257    var queries = require(require.resolve(name, { paths: ['.', ctx.path] }))258    if (typeof queries === 'object' && queries !== null && queries.__esModule) {259      queries = queries.default260    }261    if (queries) {262      if (Array.isArray(queries)) {263        return queries264      } else if (typeof queries === 'object') {265        if (!queries.defaults) queries.defaults = []266        return pickEnv(queries, ctx, name)267      }268    }269    throw new BrowserslistError(270      '`' +271        name +272        '` config exports not an array of queries' +273        ' or an object of envs'274    )275  },276 277  loadStat: function loadStat(ctx, name, data) {278    if (!ctx.dangerousExtend && !process.env.BROWSERSLIST_DANGEROUS_EXTEND) {279      checkExtend(name)280    }281    var stats = require(282      // Use forward slashes for module paths, also on Windows.283      require.resolve(path.posix.join(name, 'browserslist-stats.json'), {284        paths: ['.']285      })286    )287    return normalizeStats(data, stats)288  },289 290  getStat: function getStat(opts, data) {291    var stats292    if (opts.stats) {293      stats = opts.stats294    } else if (process.env.BROWSERSLIST_STATS) {295      stats = process.env.BROWSERSLIST_STATS296    } else if (opts.path && path.resolve && fs.existsSync) {297      stats = eachParent(298        opts.path,299        function (dir) {300          var file = path.join(dir, 'browserslist-stats.json')301          return isFile(file) ? file : undefined302        },303        statCache304      )305    }306    if (typeof stats === 'string') {307      try {308        stats = JSON.parse(fs.readFileSync(stats))309      } catch (e) {310        throw new BrowserslistError("Can't read " + stats)311      }312    }313    return normalizeStats(data, stats)314  },315 316  loadConfig: function loadConfig(opts) {317    if (process.env.BROWSERSLIST) {318      return process.env.BROWSERSLIST319    } else if (opts.config || process.env.BROWSERSLIST_CONFIG) {320      var file = opts.config || process.env.BROWSERSLIST_CONFIG321      return pickEnv(parsePackageOrReadConfig(file), opts)322    } else if (opts.path) {323      return pickEnv(module.exports.findConfig(opts.path), opts)324    } else {325      return undefined326    }327  },328 329  loadCountry: function loadCountry(usage, country, data) {330    var code = country.replace(/[^\w-]/g, '')331    if (!usage[code]) {332      var compressed333      try {334        compressed = require('caniuse-lite/data/regions/' + code + '.js')335      } catch (e) {336        throw new BrowserslistError('Unknown region name `' + code + '`.')337      }338      var usageData = region(compressed)339      normalizeUsageData(usageData, data)340      usage[country] = {}341      for (var i in usageData) {342        for (var j in usageData[i]) {343          usage[country][i + ' ' + j] = usageData[i][j]344        }345      }346    }347  },348 349  loadFeature: function loadFeature(features, name) {350    name = name.replace(/[^\w-]/g, '')351    if (features[name]) return352    var compressed353    try {354      compressed = require('caniuse-lite/data/features/' + name + '.js')355    } catch (e) {356      throw new BrowserslistError('Unknown feature name `' + name + '`.')357    }358    var stats = feature(compressed).stats359    features[name] = {}360    for (var i in stats) {361      features[name][i] = {}362      for (var j in stats[i]) {363        features[name][i][j] = stats[i][j]364      }365    }366  },367 368  parseConfig: function parseConfig(string) {369    var result = { defaults: [] }370    var sections = ['defaults']371 372    string373      .toString()374      .replace(/#[^\n]*/g, '')375      .split(/\n|,/)376      .map(function (line) {377        return line.trim()378      })379      .filter(function (line) {380        return line !== ''381      })382      .forEach(function (line) {383        if (IS_SECTION.test(line)) {384          sections = line.match(IS_SECTION)[1].trim().split(' ')385          sections.forEach(function (section) {386            if (result[section]) {387              throw new BrowserslistError(388                'Duplicate section ' + section + ' in Browserslist config'389              )390            }391            result[section] = []392          })393        } else {394          sections.forEach(function (section) {395            result[section].push(line)396          })397        }398      })399 400    return result401  },402 403  readConfig: function readConfig(file) {404    if (!isFile(file)) {405      throw new BrowserslistError("Can't read " + file + ' config')406    }407 408    return module.exports.parseConfig(fs.readFileSync(file))409  },410 411  findConfigFile: function findConfigFile(from) {412    return eachParent(413      from,414      function (dir) {415        var config = path.join(dir, 'browserslist')416        var pkg = path.join(dir, 'package.json')417        var rc = path.join(dir, '.browserslistrc')418 419        var pkgBrowserslist420        if (isFile(pkg)) {421          try {422            pkgBrowserslist = parsePackage(pkg)423          } catch (e) {424            if (e.name === 'BrowserslistError') throw e425            console.warn(426              '[Browserslist] Could not parse ' + pkg + '. Ignoring it.'427            )428          }429        }430 431        if (isFile(config) && pkgBrowserslist) {432          throw new BrowserslistError(433            dir + ' contains both browserslist and package.json with browsers'434          )435        } else if (isFile(rc) && pkgBrowserslist) {436          throw new BrowserslistError(437            dir +438              ' contains both .browserslistrc and package.json with browsers'439          )440        } else if (isFile(config) && isFile(rc)) {441          throw new BrowserslistError(442            dir + ' contains both .browserslistrc and browserslist'443          )444        } else if (isFile(config)) {445          return config446        } else if (isFile(rc)) {447          return rc448        } else if (pkgBrowserslist) {449          return pkg450        }451      },452      configPathCache453    )454  },455 456  findConfig: function findConfig(from) {457    var configFile = this.findConfigFile(from)458 459    return configFile ? parsePackageOrReadConfig(configFile) : undefined460  },461 462  clearCaches: function clearCaches() {463    dataTimeChecked = false464    statCache = {}465    configPathCache = {}466    parseConfigCache = {}467 468    this.cache = {}469  },470 471  oldDataWarning: function oldDataWarning(agentsObj) {472    if (dataTimeChecked) return473    dataTimeChecked = true474    if (process.env.BROWSERSLIST_IGNORE_OLD_DATA) return475 476    var latest = latestReleaseTime(agentsObj)477    var monthsPassed = getMonthsPassed(latest)478 479    if (latest !== 0 && monthsPassed >= 6) {480      if (process.env.BROWSERSLIST_TRACE_WARNING) {481        console.info('Last browser release in DB: ' + String(new Date(latest)))482        console.trace()483      }484 485      var months = monthsPassed + ' ' + (monthsPassed > 1 ? 'months' : 'month')486      console.warn(487        'Browserslist: browsers data (caniuse-lite) is ' +488          months +489          ' old. Please run:\n' +490          '  npx update-browserslist-db@latest\n' +491          '  Why you should do it regularly: ' +492          'https://github.com/browserslist/update-db#readme'493      )494    }495  },496 497  currentNode: function currentNode() {498    return 'node ' + process.versions.node499  },500 501  env: process.env502}503