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import type { PluginItem } from 'next/dist/compiled/babel/core'
import { dirname } from 'path'
const isLoadIntentTest = process.env.NODE_ENV === 'test'
const isLoadIntentDevelopment = process.env.NODE_ENV === 'development'
type StyledJsxPlugin = [string, any] | string
type StyledJsxBabelOptions =
| {
plugins?: StyledJsxPlugin[]
styleModule?: string
'babel-test'?: boolean
}
| undefined
// Resolve styled-jsx plugins
function styledJsxOptions(options: StyledJsxBabelOptions) {
options = options || {}
options.styleModule = 'styled-jsx/style'
if (!Array.isArray(options.plugins)) {
return options
}
options.plugins = options.plugins.map(
(plugin: StyledJsxPlugin): StyledJsxPlugin => {
if (Array.isArray(plugin)) {
const [name, pluginOptions] = plugin
return [require.resolve(name), pluginOptions]
}
return require.resolve(plugin)
}
)
return options
}
type NextBabelPresetOptions = {
'preset-env'?: any
'preset-react'?: any
'class-properties'?: any
'transform-runtime'?: any
'styled-jsx'?: StyledJsxBabelOptions
'preset-typescript'?: any
}
type BabelPreset = {
presets?: PluginItem[] | null
plugins?: PluginItem[] | null
sourceType?: 'script' | 'module' | 'unambiguous'
overrides?: Array<{ test: RegExp } & Omit<BabelPreset, 'overrides'>>
}
// Taken from https://github.com/babel/babel/commit/d60c5e1736543a6eac4b549553e107a9ba967051#diff-b4beead8ad9195361b4537601cc22532R158
function supportsStaticESM(caller: any): boolean {
return !!caller?.supportsStaticESM
}
export default (
api: any,
options: NextBabelPresetOptions = {}
): BabelPreset => {
const supportsESM = api.caller(supportsStaticESM)
const isServer = api.caller((caller: any) => !!caller && caller.isServer)
const isCallerDevelopment = api.caller((caller: any) => caller?.isDev)
// Look at external intent if used without a caller (e.g. via Jest):
const isTest = isCallerDevelopment == null && isLoadIntentTest
// Look at external intent if used without a caller (e.g. Storybook):
const isDevelopment =
isCallerDevelopment === true ||
(isCallerDevelopment == null && isLoadIntentDevelopment)
// Default to production mode if not `test` nor `development`:
const isProduction = !(isTest || isDevelopment)
const isBabelLoader = api.caller(
(caller: any) =>
!!caller &&
(caller.name === 'babel-loader' ||
caller.name === 'next-babel-turbo-loader')
)
const useJsxRuntime =
options['preset-react']?.runtime === 'automatic' ||
(Boolean(api.caller((caller: any) => !!caller && caller.hasJsxRuntime)) &&
options['preset-react']?.runtime !== 'classic')
const presetEnvConfig = {
// 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: 'auto',
exclude: ['transform-typeof-symbol'],
...options['preset-env'],
}
// When transpiling for the server or tests, target the current Node version
// if not explicitly specified:
if (
(isServer || isTest) &&
(!presetEnvConfig.targets ||
!(
typeof presetEnvConfig.targets === 'object' &&
'node' in presetEnvConfig.targets
))
) {
presetEnvConfig.targets = {
// Targets the current process' version of Node. This requires apps be
// built and deployed on the same version of Node.
// This is the same as using "current" but explicit
node: process.versions.node,
}
}
return {
sourceType: 'unambiguous',
presets: [
[
require('next/dist/compiled/babel/preset-env') as typeof import('next/dist/compiled/babel/preset-env'),
presetEnvConfig,
],
[
require('next/dist/compiled/babel/preset-react') as typeof import('next/dist/compiled/babel/preset-react'),
{
// This adds @babel/plugin-transform-react-jsx-source and
// @babel/plugin-transform-react-jsx-self automatically in development
development: isDevelopment || isTest,
...(useJsxRuntime ? { runtime: 'automatic' } : { pragma: '__jsx' }),
...options['preset-react'],
},
],
[
require('next/dist/compiled/babel/preset-typescript') as typeof import('next/dist/compiled/babel/preset-typescript'),
{ allowNamespaces: true, ...options['preset-typescript'] },
],
],
plugins: [
!useJsxRuntime && [
require('./plugins/jsx-pragma') as typeof import('./plugins/jsx-pragma'),
{
// This produces the following injected import for modules containing JSX:
// import React from 'react';
// var __jsx = React.createElement;
module: 'react',
importAs: 'React',
pragma: '__jsx',
property: 'createElement',
},
],
[
require('./plugins/optimize-hook-destructuring') as typeof import('./plugins/optimize-hook-destructuring'),
{
// only optimize hook functions imported from React/Preact
lib: true,
},
],
require('next/dist/compiled/babel/plugin-syntax-dynamic-import') as typeof import('next/dist/compiled/babel/plugin-syntax-dynamic-import'),
[
require('next/dist/compiled/babel/plugin-syntax-import-attributes') as typeof import('next/dist/compiled/babel/plugin-syntax-import-attributes'),
{
deprecatedAssertSyntax: true,
},
],
require('./plugins/react-loadable-plugin') as typeof import('./plugins/react-loadable-plugin'),
// only enable this plugin if custom config for it was provided
// otherwise we will only enable it if their browserslist triggers
// preset-env to pull it in
options['class-properties'] && [
require('next/dist/compiled/babel/plugin-proposal-class-properties') as typeof import('next/dist/compiled/babel/plugin-proposal-class-properties'),
options['class-properties'] || {},
],
[
require('next/dist/compiled/babel/plugin-proposal-object-rest-spread') as typeof import('next/dist/compiled/babel/plugin-proposal-object-rest-spread'),
{
useBuiltIns: true,
},
],
!isServer && [
require('next/dist/compiled/babel/plugin-transform-runtime') as typeof import('next/dist/compiled/babel/plugin-transform-runtime'),
{
corejs: false,
helpers: true,
regenerator: true,
useESModules: supportsESM && presetEnvConfig.modules !== 'commonjs',
absoluteRuntime: isBabelLoader
? dirname(
require.resolve(
'next/dist/compiled/@babel/runtime/package.json'
)
)
: undefined,
...options['transform-runtime'],
},
],
[
isTest && options['styled-jsx'] && options['styled-jsx']['babel-test']
? (require('styled-jsx/babel-test') as typeof import('styled-jsx/babel-test'))
: (require('styled-jsx/babel') as typeof import('styled-jsx/babel')),
styledJsxOptions(options['styled-jsx']),
],
require('./plugins/amp-attributes') as typeof import('./plugins/amp-attributes'),
isProduction && [
require('next/dist/compiled/babel/plugin-transform-react-remove-prop-types') as typeof import('next/dist/compiled/babel/plugin-transform-react-remove-prop-types'),
{
removeImport: true,
},
],
isServer &&
(require('next/dist/compiled/babel/plugin-syntax-bigint') as typeof import('next/dist/compiled/babel/plugin-syntax-bigint')),
// Always compile numeric separator because the resulting number is
// smaller.
require('next/dist/compiled/babel/plugin-proposal-numeric-separator') as typeof import('next/dist/compiled/babel/plugin-proposal-numeric-separator'),
require('next/dist/compiled/babel/plugin-proposal-export-namespace-from') as typeof import('next/dist/compiled/babel/plugin-proposal-export-namespace-from'),
].filter(Boolean),
}
}
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