var feature = require('caniuse-lite/dist/unpacker/feature').default
var region = require('caniuse-lite/dist/unpacker/region').default
var path = require('path')
var fs = require('fs')
var BrowserslistError = require('./error')
var IS_SECTION = /^\s*\[(.+)]\s*$/
var CONFIG_PATTERN = /^browserslist-config-/
var SCOPED_CONFIG__PATTERN = /@[^/]+\/browserslist-config(-|$|\/)/
var TIME_TO_UPDATE_CANIUSE = 6 * 30 * 24 * 60 * 60 * 1000
var FORMAT =
'Browserslist config should be a string or an array ' +
'of strings with browser queries'
var dataTimeChecked = false
var filenessCache = {}
var configCache = {}
function checkExtend(name) {
var use = ' Use `dangerousExtend` option to disable.'
if (!CONFIG_PATTERN.test(name) && !SCOPED_CONFIG__PATTERN.test(name)) {
throw new BrowserslistError(
'Browserslist config needs `browserslist-config-` prefix. ' + use
)
}
if (name.replace(/^@[^/]+\//, '').indexOf('.') !== -1) {
throw new BrowserslistError(
'`.` not allowed in Browserslist config name. ' + use
)
}
if (name.indexOf('node_modules') !== -1) {
throw new BrowserslistError(
'`node_modules` not allowed in Browserslist config.' + use
)
}
}
function isFile(file) {
if (file in filenessCache) {
return filenessCache[file]
}
var result = fs.existsSync(file) && fs.statSync(file).isFile()
if (!process.env.BROWSERSLIST_DISABLE_CACHE) {
filenessCache[file] = result
}
return result
}
function eachParent(file, callback) {
var dir = isFile(file) ? path.dirname(file) : file
var loc = path.resolve(dir)
do {
var result = callback(loc)
if (typeof result !== 'undefined') return result
} while (loc !== (loc = path.dirname(loc)))
return undefined
}
function check(section) {
if (Array.isArray(section)) {
for (var i = 0; i < section.length; i++) {
if (typeof section[i] !== 'string') {
throw new BrowserslistError(FORMAT)
}
}
} else if (typeof section !== 'string') {
throw new BrowserslistError(FORMAT)
}
}
function pickEnv(config, opts) {
if (typeof config !== 'object') return config
var name
if (typeof opts.env === 'string') {
name = opts.env
} else if (process.env.BROWSERSLIST_ENV) {
name = process.env.BROWSERSLIST_ENV
} else if (process.env.NODE_ENV) {
name = process.env.NODE_ENV
} else {
name = 'production'
}
if (opts.throwOnMissing) {
if (name && name !== 'defaults' && !config[name]) {
throw new BrowserslistError(
'Missing config for Browserslist environment `' + name + '`'
)
}
}
return config[name] || config.defaults
}
function parsePackage(file) {
var config = JSON.parse(
fs
.readFileSync(file)
.toString()
.replace(/^\uFEFF/m, '')
)
if (config.browserlist && !config.browserslist) {
throw new BrowserslistError(
'`browserlist` key instead of `browserslist` in ' + file
)
}
var list = config.browserslist
if (Array.isArray(list) || typeof list === 'string') {
list = { defaults: list }
}
for (var i in list) {
check(list[i])
}
return list
}
function latestReleaseTime(agents) {
var latest = 0
for (var name in agents) {
var dates = agents[name].releaseDate || {}
for (var key in dates) {
if (latest < dates[key]) {
latest = dates[key]
}
}
}
return latest * 1000
}
function normalizeStats(data, stats) {
if (!data) {
data = {}
}
if (stats && 'dataByBrowser' in stats) {
stats = stats.dataByBrowser
}
if (typeof stats !== 'object') return undefined
var normalized = {}
for (var i in stats) {
var versions = Object.keys(stats[i])
if (versions.length === 1 && data[i] && data[i].versions.length === 1) {
var normal = data[i].versions[0]
normalized[i] = {}
normalized[i][normal] = stats[i][versions[0]]
} else {
normalized[i] = stats[i]
}
}
return normalized
}
function normalizeUsageData(usageData, data) {
for (var browser in usageData) {
var browserUsage = usageData[browser]
// eslint-disable-next-line max-len
// https://github.com/browserslist/browserslist/issues/431#issuecomment-565230615
// caniuse-db returns { 0: "percentage" } for `and_*` regional stats
if ('0' in browserUsage) {
var versions = data[browser].versions
browserUsage[versions[versions.length - 1]] = browserUsage[0]
delete browserUsage[0]
}
}
}
module.exports = {
loadQueries: function loadQueries(ctx, name) {
if (!ctx.dangerousExtend && !process.env.BROWSERSLIST_DANGEROUS_EXTEND) {
checkExtend(name)
}
var queries = require(require.resolve(name, { paths: ['.', ctx.path] }))
if (queries) {
if (Array.isArray(queries)) {
return queries
} else if (typeof queries === 'object') {
if (!queries.defaults) queries.defaults = []
return pickEnv(queries, ctx, name)
}
}
throw new BrowserslistError(
'`' +
name +
'` config exports not an array of queries' +
' or an object of envs'
)
},
loadStat: function loadStat(ctx, name, data) {
if (!ctx.dangerousExtend && !process.env.BROWSERSLIST_DANGEROUS_EXTEND) {
checkExtend(name)
}
var stats = require(require.resolve(
path.join(name, 'browserslist-stats.json'),
{ paths: ['.'] }
))
return normalizeStats(data, stats)
},
getStat: function getStat(opts, data) {
var stats
if (opts.stats) {
stats = opts.stats
} else if (process.env.BROWSERSLIST_STATS) {
stats = process.env.BROWSERSLIST_STATS
} else if (opts.path && path.resolve && fs.existsSync) {
stats = eachParent(opts.path, function (dir) {
var file = path.join(dir, 'browserslist-stats.json')
return isFile(file) ? file : undefined
})
}
if (typeof stats === 'string') {
try {
stats = JSON.parse(fs.readFileSync(stats))
} catch (e) {
throw new BrowserslistError("Can't read " + stats)
}
}
return normalizeStats(data, stats)
},
loadConfig: function loadConfig(opts) {
if (process.env.BROWSERSLIST) {
return process.env.BROWSERSLIST
} else if (opts.config || process.env.BROWSERSLIST_CONFIG) {
var file = opts.config || process.env.BROWSERSLIST_CONFIG
if (path.basename(file) === 'package.json') {
return pickEnv(parsePackage(file), opts)
} else {
return pickEnv(module.exports.readConfig(file), opts)
}
} else if (opts.path) {
return pickEnv(module.exports.findConfig(opts.path), opts)
} else {
return undefined
}
},
loadCountry: function loadCountry(usage, country, data) {
var code = country.replace(/[^\w-]/g, '')
if (!usage[code]) {
var compressed
try {
compressed = require('caniuse-lite/data/regions/' + code + '.js')
} catch (e) {
throw new BrowserslistError('Unknown region name `' + code + '`.')
}
var usageData = region(compressed)
normalizeUsageData(usageData, data)
usage[country] = {}
for (var i in usageData) {
for (var j in usageData[i]) {
usage[country][i + ' ' + j] = usageData[i][j]
}
}
}
},
loadFeature: function loadFeature(features, name) {
name = name.replace(/[^\w-]/g, '')
if (features[name]) return
var compressed
try {
compressed = require('caniuse-lite/data/features/' + name + '.js')
} catch (e) {
throw new BrowserslistError('Unknown feature name `' + name + '`.')
}
var stats = feature(compressed).stats
features[name] = {}
for (var i in stats) {
features[name][i] = {}
for (var j in stats[i]) {
features[name][i][j] = stats[i][j]
}
}
},
parseConfig: function parseConfig(string) {
var result = { defaults: [] }
var sections = ['defaults']
string
.toString()
.replace(/#[^\n]*/g, '')
.split(/\n|,/)
.map(function (line) {
return line.trim()
})
.filter(function (line) {
return line !== ''
})
.forEach(function (line) {
if (IS_SECTION.test(line)) {
sections = line.match(IS_SECTION)[1].trim().split(' ')
sections.forEach(function (section) {
if (result[section]) {
throw new BrowserslistError(
'Duplicate section ' + section + ' in Browserslist config'
)
}
result[section] = []
})
} else {
sections.forEach(function (section) {
result[section].push(line)
})
}
})
return result
},
readConfig: function readConfig(file) {
if (!isFile(file)) {
throw new BrowserslistError("Can't read " + file + ' config')
}
return module.exports.parseConfig(fs.readFileSync(file))
},
findConfig: function findConfig(from) {
from = path.resolve(from)
var passed = []
var resolved = eachParent(from, function (dir) {
if (dir in configCache) {
return configCache[dir]
}
passed.push(dir)
var config = path.join(dir, 'browserslist')
var pkg = path.join(dir, 'package.json')
var rc = path.join(dir, '.browserslistrc')
var pkgBrowserslist
if (isFile(pkg)) {
try {
pkgBrowserslist = parsePackage(pkg)
} catch (e) {
if (e.name === 'BrowserslistError') throw e
console.warn(
'[Browserslist] Could not parse ' + pkg + '. Ignoring it.'
)
}
}
if (isFile(config) && pkgBrowserslist) {
throw new BrowserslistError(
dir + ' contains both browserslist and package.json with browsers'
)
} else if (isFile(rc) && pkgBrowserslist) {
throw new BrowserslistError(
dir + ' contains both .browserslistrc and package.json with browsers'
)
} else if (isFile(config) && isFile(rc)) {
throw new BrowserslistError(
dir + ' contains both .browserslistrc and browserslist'
)
} else if (isFile(config)) {
return module.exports.readConfig(config)
} else if (isFile(rc)) {
return module.exports.readConfig(rc)
} else {
return pkgBrowserslist
}
})
if (!process.env.BROWSERSLIST_DISABLE_CACHE) {
passed.forEach(function (dir) {
configCache[dir] = resolved
})
}
return resolved
},
clearCaches: function clearCaches() {
dataTimeChecked = false
filenessCache = {}
configCache = {}
this.cache = {}
},
oldDataWarning: function oldDataWarning(agentsObj) {
if (dataTimeChecked) return
dataTimeChecked = true
if (process.env.BROWSERSLIST_IGNORE_OLD_DATA) return
var latest = latestReleaseTime(agentsObj)
var halfYearAgo = Date.now() - TIME_TO_UPDATE_CANIUSE
if (latest !== 0 && latest < halfYearAgo) {
console.warn(
'Browserslist: caniuse-lite is outdated. Please run:\n' +
' npx update-browserslist-db@latest\n' +
' Why you should do it regularly: ' +
'https://github.com/browserslist/update-db#readme'
)
}
},
currentNode: function currentNode() {
return 'node ' + process.versions.node
},
env: process.env
}