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next-babel-loader.js
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next-babel-loader.js
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import babelLoader from 'babel-loader'
import { basename, join } from 'path'
import hash from 'string-hash'
// increment 'j' to invalidate cache
// eslint-disable-next-line no-useless-concat
const cacheKey = 'babel-cache-' + 'j' + '-'
const nextBabelPreset = require('../../babel/preset')
const getModernOptions = (babelOptions = {}) => {
const presetEnvOptions = Object.assign({}, babelOptions['preset-env'])
const transformRuntimeOptions = Object.assign(
{},
babelOptions['transform-runtime'],
{ regenerator: false }
)
presetEnvOptions.targets = {
esmodules: true,
}
presetEnvOptions.exclude = [
...(presetEnvOptions.exclude || []),
// Blacklist accidental inclusions
'transform-regenerator',
'transform-async-to-generator',
]
return {
...babelOptions,
'preset-env': presetEnvOptions,
'transform-runtime': transformRuntimeOptions,
}
}
const nextBabelPresetModern = presetOptions => context =>
nextBabelPreset(context, getModernOptions(presetOptions))
module.exports = babelLoader.custom(babel => {
const presetItem = babel.createConfigItem(nextBabelPreset, {
type: 'preset',
})
const applyCommonJs = babel.createConfigItem(
require('../../babel/plugins/commonjs'),
{ type: 'plugin' }
)
const commonJsItem = babel.createConfigItem(
require('@babel/plugin-transform-modules-commonjs'),
{ type: 'plugin' }
)
const configs = new Set()
return {
customOptions(opts) {
const custom = {
isServer: opts.isServer,
isModern: opts.isModern,
pagesDir: opts.pagesDir,
hasModern: opts.hasModern,
babelPresetPlugins: opts.babelPresetPlugins,
development: opts.development,
}
const filename = join(opts.cwd, 'noop.js')
const loader = Object.assign(
opts.cache
? {
cacheCompression: false,
cacheDirectory: join(opts.distDir, 'cache', 'next-babel-loader'),
cacheIdentifier:
cacheKey +
(opts.isServer ? '-server' : '') +
(opts.isModern ? '-modern' : '') +
(opts.hasModern ? '-has-modern' : '') +
'-new-polyfills' +
(opts.development ? '-development' : '-production') +
JSON.stringify(
babel.loadPartialConfig({
filename,
cwd: opts.cwd,
sourceFileName: filename,
}).options
),
}
: {
cacheDirectory: false,
},
opts
)
delete loader.isServer
delete loader.cache
delete loader.distDir
delete loader.isModern
delete loader.hasModern
delete loader.pagesDir
delete loader.babelPresetPlugins
delete loader.development
return { loader, custom }
},
config(
cfg,
{
source,
customOptions: {
isServer,
isModern,
hasModern,
pagesDir,
babelPresetPlugins,
development,
},
}
) {
const filename = this.resourcePath
const options = Object.assign({}, cfg.options)
const isPageFile = filename.startsWith(pagesDir)
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]
}
options.caller.isServer = isServer
options.caller.isModern = isModern
options.caller.isDev = development
options.plugins = options.plugins || []
if (!isServer && isPageFile) {
const pageConfigPlugin = babel.createConfigItem(
[require('../../babel/plugins/next-page-config')],
{ type: 'plugin' }
)
options.plugins.push(pageConfigPlugin)
}
if (isServer && source.indexOf('next/data') !== -1) {
const nextDataPlugin = babel.createConfigItem(
[
require('../../babel/plugins/next-data'),
{ key: basename(filename) + '-' + hash(filename) },
],
{ type: 'plugin' }
)
options.plugins.push(nextDataPlugin)
}
if (isModern) {
const nextPreset = options.presets.find(
preset => preset && preset.value === nextBabelPreset
) || { options: {} }
const additionalPresets = options.presets.filter(
preset => preset !== nextPreset
)
const presetItemModern = babel.createConfigItem(
nextBabelPresetModern(nextPreset.options),
{
type: 'preset',
}
)
options.presets = [...additionalPresets, presetItemModern]
}
// If the file has `module.exports` we have to transpile commonjs because Babel adds `import` statements
// That break webpack, since webpack doesn't support combining commonjs and esmodules
if (!hasModern && source.indexOf('module.exports') !== -1) {
options.plugins.push(applyCommonJs)
}
options.plugins.push([
require.resolve('babel-plugin-transform-define'),
{
'process.env.NODE_ENV': development ? 'development' : 'production',
'typeof window': isServer ? 'undefined' : 'object',
'process.browser': isServer ? false : true,
},
'next-js-transform-define-instance',
])
if (isPageFile) {
if (!isServer) {
options.plugins.push([
require.resolve('../../babel/plugins/next-ssg-transform'),
{},
])
}
}
// As next-server/lib has stateful modules we have to transpile commonjs
options.overrides = [
...(options.overrides || []),
{
test: [
/next[\\/]dist[\\/]next-server[\\/]lib/,
/next[\\/]dist[\\/]client/,
/next[\\/]dist[\\/]pages/,
],
plugins: [commonJsItem],
},
]
for (const plugin of babelPresetPlugins) {
require(join(plugin.dir, 'src', 'babel-preset-build.js'))(
options,
plugin.config || {}
)
}
return options
},
}
})