98 строки
3.0 KiB
JavaScript
98 строки
3.0 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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// Register Babel to allow the transformer itself to be loaded from source.
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if (process.env.FBSOURCE_ENV) {
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// Internal: Use `@fb-scripts/babel-register` to re-use internal
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// registration, rather than potentially clobbering it and conflicting with
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// other Jest projects running in the same process.
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// This package should *NOT* be a dependency of `@react-native/monorepo`.
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// $FlowIgnore[cannot-resolve-module]
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require('@fb-scripts/babel-register');
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} else {
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metroBabelRegister([nodeFiles]);
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}
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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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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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]) /*: any */),
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};
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