144 lines
5.0 KiB
JavaScript
144 lines
5.0 KiB
JavaScript
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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'use strict';
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const path = require('path');
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const validateBoolOption = (name, value, defaultValue) => {
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if (typeof value === 'undefined') {
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value = defaultValue;
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}
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if (typeof value !== 'boolean') {
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throw new Error(`Preset react-app: '${name}' option must be a boolean.`);
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}
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return value;
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};
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module.exports = function (api, opts) {
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if (!opts) {
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opts = {};
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}
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// This is similar to how `env` works in Babel:
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// https://babeljs.io/docs/usage/babelrc/#env-option
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// We are not using `env` because it’s ignored in versions > babel-core@6.10.4:
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// https://github.com/babel/babel/issues/4539
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// https://github.com/facebook/create-react-app/issues/720
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// It’s also nice that we can enforce `NODE_ENV` being specified.
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var env = process.env.BABEL_ENV || process.env.NODE_ENV;
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var isEnvDevelopment = env === 'development';
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var isEnvProduction = env === 'production';
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var isEnvTest = env === 'test';
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var areHelpersEnabled = validateBoolOption('helpers', opts.helpers, false);
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var useAbsoluteRuntime = validateBoolOption(
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'absoluteRuntime',
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opts.absoluteRuntime,
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true
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);
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var absoluteRuntimePath = undefined;
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if (useAbsoluteRuntime) {
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absoluteRuntimePath = path.dirname(
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require.resolve('@babel/runtime/package.json')
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);
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}
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if (!isEnvDevelopment && !isEnvProduction && !isEnvTest) {
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throw new Error(
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'Using `babel-preset-react-app` requires that you specify `NODE_ENV` or ' +
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'`BABEL_ENV` environment variables. Valid values are "development", ' +
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'"test", and "production". Instead, received: ' +
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JSON.stringify(env) +
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'.'
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);
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}
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return {
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// Babel assumes ES Modules, which isn't safe until CommonJS
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// dies. This changes the behavior to assume CommonJS unless
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// an `import` or `export` is present in the file.
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// https://github.com/webpack/webpack/issues/4039#issuecomment-419284940
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sourceType: 'unambiguous',
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presets: [
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isEnvTest && [
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// ES features necessary for user's Node version
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require('@babel/preset-env').default,
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{
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targets: {
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node: 'current',
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},
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// Exclude transforms that make all code slower
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exclude: ['transform-typeof-symbol'],
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},
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],
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(isEnvProduction || isEnvDevelopment) && [
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// Latest stable ECMAScript features
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require('@babel/preset-env').default,
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{
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// Allow importing core-js in entrypoint and use browserlist to select polyfills
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useBuiltIns: 'entry',
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// Set the corejs version we are using to avoid warnings in console
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// This will need to change once we upgrade to corejs@3
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corejs: 3,
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// Exclude transforms that make all code slower
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exclude: ['transform-typeof-symbol'],
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},
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],
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].filter(Boolean),
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plugins: [
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// Disabled as it's handled automatically by preset-env, and `selectiveLoose` isn't
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// yet merged into babel: https://github.com/babel/babel/pull/9486
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// Related: https://github.com/facebook/create-react-app/pull/8215
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// [
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// require('@babel/plugin-transform-destructuring').default,
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// {
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// // Use loose mode for performance:
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// // https://github.com/facebook/create-react-app/issues/5602
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// loose: false,
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// selectiveLoose: [
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// 'useState',
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// 'useEffect',
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// 'useContext',
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// 'useReducer',
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// 'useCallback',
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// 'useMemo',
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// 'useRef',
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// 'useImperativeHandle',
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// 'useLayoutEffect',
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// 'useDebugValue',
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// ],
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// },
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// ],
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// Polyfills the runtime needed for async/await, generators, and friends
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// https://babeljs.io/docs/en/babel-plugin-transform-runtime
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[
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require('@babel/plugin-transform-runtime').default,
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{
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corejs: false,
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helpers: areHelpersEnabled,
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// By default, babel assumes babel/runtime version 7.0.0-beta.0,
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// explicitly resolving to match the provided helper functions.
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// https://github.com/babel/babel/issues/10261
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version: require('@babel/runtime/package.json').version,
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regenerator: true,
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// https://babeljs.io/docs/en/babel-plugin-transform-runtime#useesmodules
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// We should turn this on once the lowest version of Node LTS
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// supports ES Modules.
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useESModules: isEnvDevelopment || isEnvProduction,
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// Undocumented option that lets us encapsulate our runtime, ensuring
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// the correct version is used
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// https://github.com/babel/babel/blob/090c364a90fe73d36a30707fc612ce037bdbbb24/packages/babel-plugin-transform-runtime/src/index.js#L35-L42
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absoluteRuntime: absoluteRuntimePath,
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},
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],
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].filter(Boolean),
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};
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};
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