mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Rob Hogan
971bb81d13
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/38146 Now that `metro-react-native-babel-transformer` may be loaded from source without transformation, we can remove this workaround / potential footgun. Jest uses Babel imperatively and doesn't rely on registration (require hooks), so registering within the preprocessor potentially conflicts and has caused problems before. This just tidies up some complexity we don't need. Changelog: [Internal] Reviewed By: christophpurrer Differential Revision: D47162728 fbshipit-source-id: 06215f9bb7b8e71bcca0429d0bae9f20a22f45a8
88 lines
2.5 KiB
JavaScript
88 lines
2.5 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow
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*/
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/* eslint-env node */
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'use strict';
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const metroBabelRegister = require('metro-babel-register');
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const createCacheKeyFunction =
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require('@jest/create-cache-key-function').default;
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const {transformSync: babelTransformSync} = require('@babel/core');
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const generate = require('@babel/generator').default;
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// Files matching this pattern will be transformed with the Node JS Babel
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// transformer, rather than with the React Native Babel transformer. Scripts
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// intended to run through Node JS should be included here.
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const nodeFiles = /[\\/]metro(?:-[^/]*)[\\/]/;
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// Get Babel config from metro-babel-register, without registering a require
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// hook. This is used below to configure babelTransformSync under Jest.
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const {only: _, ...nodeBabelOptions} = metroBabelRegister.config([]);
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const transformer = require('metro-react-native-babel-transformer');
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module.exports = {
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process(src /*: string */, file /*: string */) /*: {code: string, ...} */ {
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if (nodeFiles.test(file)) {
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// node specific transforms only
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return babelTransformSync(src, {
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filename: file,
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sourceType: 'script',
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...nodeBabelOptions,
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ast: false,
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});
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}
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const {ast} = transformer.transform({
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filename: file,
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options: {
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ast: true, // needed for open source (?) https://github.com/facebook/react-native/commit/f8d6b97140cffe8d18b2558f94570c8d1b410d5c#r28647044
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dev: true,
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enableBabelRuntime: false,
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experimentalImportSupport: false,
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globalPrefix: '',
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hot: false,
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inlineRequires: true,
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minify: false,
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platform: '',
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projectRoot: '',
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publicPath: '/assets',
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retainLines: true,
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sourceType: 'unambiguous', // b7 required. detects module vs script mode
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},
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src,
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});
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return generate(
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ast,
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// $FlowFixMe[prop-missing] Error found when improving flow typing for libs
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{
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code: true,
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comments: false,
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compact: false,
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filename: file,
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retainLines: true,
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sourceFileName: file,
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sourceMaps: true,
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},
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src,
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);
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},
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// $FlowFixMe[signature-verification-failure]
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getCacheKey: createCacheKeyFunction([
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__filename,
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require.resolve('metro-react-native-babel-transformer'),
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require.resolve('@babel/core/package.json'),
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]),
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};
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