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Allow to configure any options of babel-preset-env #1415

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Allow to configure any options of babel-preset-env #1415

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196 changes: 100 additions & 96 deletions packages/babel-preset-react-app/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,106 +10,110 @@

var path = require('path');

const plugins = [
// class { handleClick = () => { } }
require.resolve('babel-plugin-transform-class-properties'),
// The following two plugins use Object.assign directly, instead of Babel's
// extends helper. Note that this assumes `Object.assign` is available.
// { ...todo, completed: true }
[require.resolve('babel-plugin-transform-object-rest-spread'), {
useBuiltIns: true
}],
// Transforms JSX
[require.resolve('babel-plugin-transform-react-jsx'), {
useBuiltIns: true
}],
// Polyfills the runtime needed for async/await and generators
[require.resolve('babel-plugin-transform-runtime'), {
helpers: false,
polyfill: false,
regenerator: true,
// Resolve the Babel runtime relative to the config.
moduleName: path.dirname(require.resolve('babel-runtime/package'))
}]
];
module.exports = function buildPreset(context, opts) {
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 > [email protected]:
// https://github.com/babel/babel/issues/4539
// https://github.com/facebookincubator/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;
if (env !== 'development' && env !== 'test' && env !== 'production') {
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) + '.'
);
}
const plugins = [
// class { handleClick = () => { } }
require.resolve('babel-plugin-transform-class-properties'),
// The following two plugins use Object.assign directly, instead of Babel's
// extends helper. Note that this assumes `Object.assign` is available.
// { ...todo, completed: true }
[require.resolve('babel-plugin-transform-object-rest-spread'), {
useBuiltIns: true
}],
// Transforms JSX
[require.resolve('babel-plugin-transform-react-jsx'), {
useBuiltIns: true
}],
// Polyfills the runtime needed for async/await and generators
[require.resolve('babel-plugin-transform-runtime'), {
helpers: false,
polyfill: false,
regenerator: true,
// Resolve the Babel runtime relative to the config.
moduleName: path.dirname(require.resolve('babel-runtime/package'))
}]
];

if (env === 'development' || env === 'test') {
// The following two plugins are currently necessary to make React warnings
// include more valuable information. They are included here because they are
// currently not enabled in babel-preset-react. See the below threads for more info:
// https://github.com/babel/babel/issues/4702
// https://github.com/babel/babel/pull/3540#issuecomment-228673661
// https://github.com/facebookincubator/create-react-app/issues/989
plugins.push.apply(plugins, [
// Adds component stack to warning messages
require.resolve('babel-plugin-transform-react-jsx-source'),
// Adds __self attribute to JSX which React will use for some warnings
require.resolve('babel-plugin-transform-react-jsx-self')
]);
}
// 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 > [email protected]:
// https://github.com/babel/babel/issues/4539
// https://github.com/facebookincubator/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;
if (env !== 'development' && env !== 'test' && env !== 'production') {
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) + '.'
);
}

if (env === 'development' || env === 'test') {
// The following two plugins are currently necessary to make React warnings
// include more valuable information. They are included here because they are
// currently not enabled in babel-preset-react. See the below threads for more info:
// https://github.com/babel/babel/issues/4702
// https://github.com/babel/babel/pull/3540#issuecomment-228673661
// https://github.com/facebookincubator/create-react-app/issues/989
plugins.push.apply(plugins, [
// Adds component stack to warning messages
require.resolve('babel-plugin-transform-react-jsx-source'),
// Adds __self attribute to JSX which React will use for some warnings
require.resolve('babel-plugin-transform-react-jsx-self')
]);
}

if (env === 'test') {
plugins.push.apply(plugins, [
// We always include this plugin regardless of environment
// because of a Babel bug that breaks object rest/spread without it:
// https://github.com/babel/babel/issues/4851
require.resolve('babel-plugin-transform-es2015-parameters')
]);
if (env === 'test') {
plugins.push.apply(plugins, [
// We always include this plugin regardless of environment
// because of a Babel bug that breaks object rest/spread without it:
// https://github.com/babel/babel/issues/4851
require.resolve('babel-plugin-transform-es2015-parameters')
]);

module.exports = {
presets: [
// ES features necessary for user's Node version
[require('babel-preset-env').default, {
targets: {
node: 'current',
},
}],
// JSX, Flow
require.resolve('babel-preset-react')
],
plugins: plugins
};
} else {
module.exports = {
presets: [
// Latest stable ECMAScript features
require.resolve('babel-preset-latest'),
// JSX, Flow
require.resolve('babel-preset-react')
],
plugins: plugins.concat([
// function* () { yield 42; yield 43; }
[require.resolve('babel-plugin-transform-regenerator'), {
// Async functions are converted to generators by babel-preset-latest
async: false
}],
])
};
return {
presets: [
// ES features necessary for user's Node version
[require('babel-preset-env').default, Object.assign({}, opts, {
targets: {
node: 'current',
},
})],
// JSX, Flow
require.resolve('babel-preset-react')
],
plugins: plugins
};
} else {
return {
presets: [
// Latest stable ECMAScript features
require.resolve('babel-preset-latest'),
// JSX, Flow
require.resolve('babel-preset-react')
],
plugins: plugins.concat([
// function* () { yield 42; yield 43; }
[require.resolve('babel-plugin-transform-regenerator'), {
// Async functions are converted to generators by babel-preset-latest
async: false
}],
])
};

if (env === 'production') {
// Optimization: hoist JSX that never changes out of render()
// Disabled because of issues:
// * https://github.com/facebookincubator/create-react-app/issues/525
// * https://phabricator.babeljs.io/search/query/pCNlnC2xzwzx/
// * https://github.com/babel/babel/issues/4516
// TODO: Enable again when these issues are resolved.
// plugins.push.apply(plugins, [
// require.resolve('babel-plugin-transform-react-constant-elements')
// ]);
if (env === 'production') {
// Optimization: hoist JSX that never changes out of render()
// Disabled because of issues:
// * https://github.com/facebookincubator/create-react-app/issues/525
// * https://phabricator.babeljs.io/search/query/pCNlnC2xzwzx/
// * https://github.com/babel/babel/issues/4516
// TODO: Enable again when these issues are resolved.
// plugins.push.apply(plugins, [
// require.resolve('babel-plugin-transform-react-constant-elements')
// ]);
}
}
}