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next.js/packages/next/build/webpack/loaders/next-babel-loader.js

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import babelLoader from 'babel-loader'
module.exports = babelLoader.custom(babel => {
const presetItem = babel.createConfigItem(require('../../babel/preset'), {type: 'preset'})
const configs = new Set()
return {
customOptions (opts) {
const custom = {
isServer: opts.isServer,
dev: opts.dev
}
const loader = Object.assign({
cacheCompression: false,
cacheDirectory: true
}, opts)
delete loader.isServer
delete loader.dev
return { loader, custom }
},
config (cfg, {customOptions: {isServer, dev}}) {
const options = Object.assign({}, cfg.options)
if (cfg.hasFilesystemConfig()) {
for (const file of [cfg.babelrc, cfg.config]) {
// We only log for client compilation otherwise there will be double output
if (file && !isServer && !configs.has(file)) {
configs.add(file)
console.log(`> Using external babel configuration`)
console.log(`> Location: "${file}"`)
}
}
} else {
// Add our default preset if the no "babelrc" found.
options.presets = [...options.presets, presetItem]
}
return options
}
}
})