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babel-preset-react-app: Allow passing options #835

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babel-preset-react-app: Allow passing options #835

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124 changes: 64 additions & 60 deletions packages/babel-preset-react-app/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,65 +10,69 @@

var path = require('path');

module.exports = {
presets: [
// Latest stable ECMAScript features
require.resolve('babel-preset-latest'),
// JSX, Flow
require.resolve('babel-preset-react')
],
plugins: [
// class { handleClick = () => { } }
require.resolve('babel-plugin-transform-class-properties'),
// { ...todo, completed: true }
require.resolve('babel-plugin-transform-object-rest-spread'),
// function* () { yield 42; yield 43; }
[require.resolve('babel-plugin-transform-regenerator'), {
// Async functions are converted to generators by babel-preset-latest
async: false
}],
// 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(context, opts) {
var out = {
presets: [
// Latest stable ECMAScript features
[require.resolve('babel-preset-latest'), opts],
// JSX, Flow
require.resolve('babel-preset-react')
],
plugins: [
// class { handleClick = () => { } }
require.resolve('babel-plugin-transform-class-properties'),
// { ...todo, completed: true }
require.resolve('babel-plugin-transform-object-rest-spread'),
// function* () { yield 42; yield 43; }
[require.resolve('babel-plugin-transform-regenerator'), {
// Async functions are converted to generators by babel-preset-latest
async: false
}],
// 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'))
}]
]
};

// 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/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) + '.'
);
}
var plugins = module.exports.plugins;
if (env === 'development' || env === 'test') {
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 === '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')
// ]);
// 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/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) + '.'
);
}
var plugins = out.plugins;
if (env === 'development' || env === 'test') {
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 === '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')
// ]);
}

return out;
}