metro/transformer.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
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*
* Note: This is a fork of the fb-specific transform.js
*/
'use strict';
const babel = require('babel-core');
const inlineRequires = require('fbjs-scripts/babel/inline-requires');
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function transform(src, filename, options) {
const plugins = [];
if (process.env.NODE_ENV === 'production') {
plugins.push('node-env-inline', 'dunderscore-dev-inline');
} else if (process.env.NODE_ENV === 'test') {
plugins.push({
position: 'after',
transformer: inlineRequires,
});
}
const result = babel.transform(src, {
retainLines: true,
compact: true,
comments: false,
filename,
whitelist: [
// Keep in sync with packager/react-packager/.babelrc
'es6.arrowFunctions',
'es6.blockScoping',
'es6.classes',
'es6.constants',
'es6.destructuring',
'es6.modules',
'es6.parameters',
'es6.properties.computed',
'es6.properties.shorthand',
'es6.spread',
'es6.templateLiterals',
'es7.asyncFunctions',
'es7.trailingFunctionCommas',
'es7.objectRestSpread',
'flow',
'react',
'react.displayName',
'regenerator',
],
plugins,
sourceFileName: filename,
sourceMaps: false,
extra: options || {},
});
return {
code: result.code
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};
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}
module.exports = function(data, callback) {
let result;
try {
result = transform(data.sourceCode, data.filename);
} catch (e) {
callback(e);
return;
}
callback(null, result);
};
// export for use in jest
module.exports.transform = transform;