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index.js
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index.js
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const browserslist = require('browserslist')
// convert the browserslist field in package.json to
// esbuild compatible array of browsers
function browserslistToEsbuild(browserslistConfig) {
if (!browserslistConfig) {
// the path from where the script is run
const path = process.cwd()
// read config if none is passed
browserslistConfig = browserslist.loadConfig({ path })
}
const SUPPORTED_ESBUILD_TARGETS = ['es', 'chrome', 'edge', 'firefox', 'ios', 'node', 'safari']
// 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)
// filter out the unsupported ones
.filter((b) => !UNSUPPORTED.some((u) => b.startsWith(u)))
// 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
})
// only get the ones supported by esbuild
.filter((b) => SUPPORTED_ESBUILD_TARGETS.includes(b[0]))
// only get the oldest version
.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(''))
)
}
module.exports = browserslistToEsbuild