mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Rob Hogan
7f54dd6cb3
Summary: Currently, `metro-babel-register` has a function as its default export, to which we've tagged on various properties. This tidies that up to a more idiomatic object of named exports, with `register` as a new one of them. This also serves to make it more compatible with automatic TypeScript generation. This is semver breaking, but `metro-babel-register` has very little usage outside Meta projects so isn't expected to be disruptive. Changelog: [Internal] Metro changelog: ``` - **[Breaking]**: Move metro-babel-register's main function to a named export `register` ``` Differential Revision: D78157559
79 lines
2.0 KiB
JavaScript
79 lines
2.0 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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* @flow strict-local
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* @format
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*/
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const {
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PACKAGES_DIR,
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PRIVATE_DIR,
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RN_INTEGRATION_TESTS_RUNNER_DIR,
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SCRIPTS_DIR,
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} = require('./consts');
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let isRegisteredForMonorepo = false;
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/**
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* Calling this function enables all Node.js packages to run from source when
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* developing in the React Native repo.
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*
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* A call should located in each entry point file in a package (i.e. for all
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* paths in "exports"), inside a special `if` condition that will be compiled
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* away on build.
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*
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* ```js
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* // Place in a package entry point
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* if (!process.env.BUILD_EXCLUDE_BABEL_REGISTER) {
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* require('../../../scripts/shared/babelRegister').registerForMonorepo();
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* }
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* ```
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*/
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function registerForMonorepo() {
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if (isRegisteredForMonorepo) {
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return;
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}
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if (process.env.FBSOURCE_ENV === '1') {
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// $FlowExpectedError[cannot-resolve-module] - Won't resolve in OSS
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require('@fb-tools/babel-register');
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} else {
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// Temporarily allow the default export to be a function (Metro <= 0.82),
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// or contain a `register` function (Metro >= 0.83). Remove shim once Metro
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// is bumped in OSS.
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const metroBabelRegister = require('metro-babel-register') /*:: as $FlowFixMe */;
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const registerFunction =
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typeof metroBabelRegister.register === 'function'
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? metroBabelRegister.register
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: metroBabelRegister;
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registerFunction([
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PACKAGES_DIR,
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PRIVATE_DIR,
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SCRIPTS_DIR,
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RN_INTEGRATION_TESTS_RUNNER_DIR,
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]);
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}
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isRegisteredForMonorepo = true;
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}
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/**
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* Calling this function enables entry points under scripts/ to run from source.
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*
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* ```js
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* // Place in a script entry point
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* require('../shared/babelRegister').registerForScript();
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* ```
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*/
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function registerForScript() {
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registerForMonorepo();
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}
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module.exports = {
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registerForMonorepo,
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registerForScript,
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};
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