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next.js/packages/next/build/babel/preset.js

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const env = process.env.NODE_ENV
const isProduction = env === 'production'
const isDevelopment = env === 'development'
const isTest = env === 'test'
// Resolve styled-jsx plugins
function styledJsxOptions (opts) {
if (!opts) {
return {}
}
if (!Array.isArray(opts.plugins)) {
return opts
}
opts.plugins = opts.plugins.map(plugin => {
if (Array.isArray(plugin)) {
const [name, options] = plugin
return [
require.resolve(name),
options
]
}
return require.resolve(plugin)
})
return opts
}
module.exports = (context, opts = {}) => ({
presets: [
[require('@babel/preset-env').default, {
// In the test environment `modules` is often needed to be set to true, babel figures that out by itself using the `'auto'` option
// In production/development this option is set to `false` so that webpack can handle import/export with tree-shaking
modules: isDevelopment || isProduction ? false : 'auto',
...opts['preset-env']
}],
[require('@babel/preset-react'), {
// This adds @babel/plugin-transform-react-jsx-source and
// @babel/plugin-transform-react-jsx-self automatically in development
development: isDevelopment || isTest,
...opts['preset-react']
}]
],
plugins: [
require('babel-plugin-react-require'),
require('@babel/plugin-syntax-dynamic-import'),
require('./plugins/react-loadable-plugin'),
[require('@babel/plugin-proposal-class-properties'), opts['class-properties'] || {}],
require('@babel/plugin-proposal-object-rest-spread'),
[require('@babel/plugin-transform-runtime'), {
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helpers: false,
regenerator: true,
...opts['transform-runtime']
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}],
[require('styled-jsx/babel'), styledJsxOptions(opts['styled-jsx'])],
process.env.NODE_ENV === 'production' && require('babel-plugin-transform-react-remove-prop-types')
].filter(Boolean)
})