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