124 строки
3.9 KiB
JavaScript
124 строки
3.9 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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/* eslint-disable lint/sort-imports */
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const metroBabelRegister = require('metro-babel-register');
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const nullthrows = require('nullthrows');
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const createCacheKeyFunction =
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require('@jest/create-cache-key-function').default;
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const {
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transformSync: babelTransformSync,
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transformFromAstSync: babelTransformFromAstSync,
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} = 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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require('../scripts/build/babel-register').registerForMonorepo();
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const transformer = require('@react-native/metro-babel-transformer');
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// Set BUILD_EXCLUDE_BABEL_REGISTER (see ../scripts/build/babel-register.js) to
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// prevent inline Babel registration in code under test, normally required when
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// running from source, but not in combination with the Jest transformer.
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const babelPluginPreventBabelRegister = [
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require.resolve('babel-plugin-transform-define'),
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{
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'process.env.BUILD_EXCLUDE_BABEL_REGISTER': true,
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},
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];
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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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plugins: [
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...(nodeBabelOptions.plugins ?? []),
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babelPluginPreventBabelRegister,
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],
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ast: false,
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});
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}
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let {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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hermesParser: true,
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hot: false,
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// $FlowFixMe[incompatible-call] TODO: Remove when `inlineRequires` has been removed from metro-babel-transformer in OSS
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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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const babelTransformResult = babelTransformFromAstSync(ast, src, {
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ast: true,
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retainLines: true,
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plugins: [
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// TODO(moti): Replace with require('metro-transform-plugins').inlineRequiresPlugin when available in OSS
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require('babel-preset-fbjs/plugins/inline-requires'),
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babelPluginPreventBabelRegister,
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],
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sourceType: 'module',
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});
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ast = nullthrows(babelTransformResult.ast);
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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('@react-native/metro-babel-transformer'),
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require.resolve('@babel/core/package.json'),
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]),
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};
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