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- import browserslist from 'browserslist'
- // convert the browserslist field in package.json to
- // esbuild compatible array of browsers
- export default function browserslistToEsbuild(browserslistConfig, options = {}) {
- if (!browserslistConfig) {
- // the path from where the script is run
- const path = process.cwd()
- // read config if none is passed
- browserslistConfig = browserslist.loadConfig({ path, ...options })
- }
- const SUPPORTED_ESBUILD_TARGETS = [
- 'es',
- 'chrome',
- 'edge',
- 'firefox',
- 'ios',
- 'node',
- 'safari',
- 'opera',
- 'ie',
- ]
- // https://github.com/eBay/browserslist-config/issues/16#issuecomment-863870093
- const UNSUPPORTED = ['android 4']
- const replaces = {
- ios_saf: 'ios',
- android: 'chrome',
- }
- const separator = ' '
- return (
- browserslist(browserslistConfig, options)
- // filter out the unsupported ones
- .filter((b) => !UNSUPPORTED.some((u) => b.startsWith(u)))
- // replaces safari TP with latest safari version
- .map((b) => {
- if (b === 'safari TP') {
- return browserslist('last 1 safari version')[0]
- }
- return b
- })
- // transform into ['chrome', '88']
- .map((b) => b.split(separator))
- // replace the similar browser
- .map((b) => {
- if (replaces[b[0]]) {
- b[0] = replaces[b[0]]
- }
- return b
- })
- // 11.0-12.0 --> 11.0
- .map((b) => {
- if (b[1].includes('-')) {
- b[1] = b[1].slice(0, b[1].indexOf('-'))
- }
- return b
- })
- // 11.0 --> 11
- .map((b) => {
- if (b[1].endsWith('.0')) {
- b[1] = b[1].slice(0, -2)
- }
- return b
- })
- // removes invalid versions that will break esbuild
- // https://github.com/evanw/esbuild/blob/35c0d65b9d4f29a26176404d2890d1b499634e9f/compat-table/src/caniuse.ts#L119-L122
- .filter((b) => /^\d+(\.\d+)*$/.test(b[1]))
- // only get the targets supported by esbuild
- .filter((b) => SUPPORTED_ESBUILD_TARGETS.includes(b[0]))
- // only get the oldest version, assuming that the older version
- // is last in the array
- .reduce((acc, b) => {
- const existingIndex = acc.findIndex((br) => br[0] === b[0])
- if (existingIndex !== -1) {
- acc[existingIndex][1] = b[1]
- } else {
- acc.push(b)
- }
- return acc
- }, [])
- // remove separator
- .map((b) => b.join(''))
- )
- }
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