135 lines
3.9 KiB
JavaScript
135 lines
3.9 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* Note: This is a fork of the fb-specific transform.js
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*/
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'use strict';
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const babel = require('babel-core');
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const externalHelpersPlugin = require('babel-plugin-external-helpers');
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const fs = require('fs');
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const makeHMRConfig = require('babel-preset-react-native/configs/hmr');
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const resolvePlugins = require('babel-preset-react-native/lib/resolvePlugins');
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const inlineRequiresPlugin = require('babel-preset-fbjs/plugins/inline-requires');
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const json5 = require('json5');
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const path = require('path');
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/**
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* Return a memoized function that checks for the existence of a
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* project level .babelrc file, and if it doesn't exist, reads the
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* default RN babelrc file and uses that.
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*/
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const getBabelRC = (function() {
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let babelRC = null;
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return function _getBabelRC(projectRoots) {
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if (babelRC !== null) {
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return babelRC;
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}
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babelRC = { plugins: [] }; // empty babelrc
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// Let's look for the .babelrc in the first project root.
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// In the future let's look into adding a command line option to specify
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// this location.
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//
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// NOTE: we're not reading the project's .babelrc here. We leave it up to
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// Babel to do that automatically and apply the transforms accordingly
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// (which works because we pass in `filename` and `sourceFilename` to
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// Babel when we transform).
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let projectBabelRCPath;
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if (projectRoots && projectRoots.length > 0) {
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projectBabelRCPath = path.resolve(projectRoots[0], '.babelrc');
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}
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// If a .babelrc file doesn't exist in the project,
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// use the Babel config provided with react-native.
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if (!projectBabelRCPath || !fs.existsSync(projectBabelRCPath)) {
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babelRC = json5.parse(
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fs.readFileSync(
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path.resolve(__dirname, 'react-packager', 'rn-babelrc.json'))
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);
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// Require the babel-preset's listed in the default babel config
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babelRC.presets = babelRC.presets.map((preset) => require('babel-preset-' + preset));
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babelRC.plugins = resolvePlugins(babelRC.plugins);
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}
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return babelRC;
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};
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})();
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/**
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* Given a filename and options, build a Babel
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* config object with the appropriate plugins.
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*/
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function buildBabelConfig(filename, options) {
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const babelRC = getBabelRC(options.projectRoots);
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const extraConfig = {
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filename,
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sourceFileName: filename,
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};
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let config = Object.assign({}, babelRC, extraConfig);
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// Add extra plugins
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const extraPlugins = [externalHelpersPlugin];
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var inlineRequires = options.inlineRequires;
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var blacklist = inlineRequires && inlineRequires.blacklist;
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if (inlineRequires && !(blacklist && filename in blacklist)) {
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extraPlugins.push(inlineRequiresPlugin);
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}
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config.plugins = extraPlugins.concat(config.plugins);
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if (options.hot) {
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const hmrConfig = makeHMRConfig(options, filename);
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config = Object.assign({}, config, hmrConfig);
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}
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return Object.assign({}, babelRC, config);
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}
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function transform(src, filename, options) {
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options = options || {};
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const OLD_BABEL_ENV = process.env.BABEL_ENV;
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process.env.BABEL_ENV = options.dev ? 'development' : 'production';
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try {
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const babelConfig = buildBabelConfig(filename, options);
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const result = babel.transform(src, babelConfig);
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return {
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ast: result.ast,
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code: result.code,
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map: result.map,
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filename: filename,
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};
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} finally {
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process.env.BABEL_ENV = OLD_BABEL_ENV;
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}
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}
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module.exports = function(data, callback) {
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let result;
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try {
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result = transform(data.sourceCode, data.filename, data.options);
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} catch (e) {
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callback(e);
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return;
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}
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callback(null, result);
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};
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// export for use in jest
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module.exports.transform = transform;
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