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Summary: > NOTE: Replaces facebook#38240 ## Context RFC: Decoupling Flipper from React Native core: react-native-community/discussions-and-proposals#641 ## Changes To support incoming new React Native packages around debugging (including migrating over [`react-native-community/cli-plugin-metro`](https://github.com/react-native-community/cli/tree/main/packages/cli-plugin-metro)) — which target Node.js and require a build step, this PR adds a minimal shared build setup across the `react-native` monorepo. The setup is closely inspired/based on the build scripts in Jest, Metro, and React Native CLI — and is a simple set of script wrappers around Babel. These are available as build commands at the root of the repo: - `yarn build` — Builds all configured packages. Functionally, this: - Outputs a `dist/` directory with built files. - Rewrites package.json `"exports"` to update every `./src/*` reference to `./dist/*` (source of truth). - `scripts/build/babel-register.js` — Allows running all Node.js entry points from source, similar to the current setup in [facebook/metro](https://github.com/facebook/metro). (Example entry point file in this PR: `packages/dev-middleware/src/index.js`) Build configuration (i.e. Babel config) is shared as a set standard across the monorepo, and **packages are opted-in to requiring a build**, configured in `scripts/build.config.js`. ``` const buildConfig /*: BuildConfig */ = { // The packages to include for build and their build options packages: { 'dev-middleware': {target: 'node'}, }, }; ``` For now, there is a single `target: 'node'` option — this is necessary as `react-native`, unlike the above other projects, is a repository with packages targeting several runtimes. We may, in future, introduce a build step for other, non-Node, packages — which may be useful for things such as auto-generated TypeScript definitions. {F1043312771} **Differences from the Metro setup** - References (and compiles out) repo-local `scripts/build/babel-register.js` — removing need for an npm-published dependency. ## Current integration points - **CircleCI** — `yarn build` is added to the `build_npm_package` and `find_and_publish_bumped_packages` jobs. **New Node.js package(s) are not load bearing quite yet**: There are not yet any built packages added to the dependencies of `packages/react-native/`, so this will be further tested in a later PR (and is actively being done in an internal commit stack). ### Alternative designs **Per-package config file** Replace `scripts/build/config.js` with a package-defined key in in `package.json`, similar to Jest's [`publishConfig`](https://github.com/jestjs/jest/blob/1f019afdcdfc54a6664908bb45f343db4e3d0848/packages/jest-cli/package.json#L87C3-L89C4). ``` "buildConfig": { "type": "node" }, ``` This would be the only customisation required, with a single Babel config still standardised. Another option this might receive in future is `enableTypeScriptCodgeen`. **Rollup** More sophisticated build tool for Node.js, used by the React codebase (albeit within a custom script setup as well). **Lerna and Nx** - Most sophisticated setup enabling caching and optimised cloud runs. - Probably the most likely thing we'll move towards at a later stage. Changelog: [Internal] Differential Revision: D47760330 fbshipit-source-id: 7b18321201f3ff8a3e729c6171ca88a3ad319f1e
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| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow strict | ||
| * @format | ||
| * @oncall react_native | ||
| */ | ||
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| declare module '@pkgjs/parseargs' { | ||
| declare type ParseArgsOptionConfig = { | ||
| type: 'string' | 'boolean', | ||
| short?: string, | ||
| multiple?: boolean, | ||
| }; | ||
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| declare type ParseArgsOptionsConfig = { | ||
| [longOption: string]: ParseArgsOptionConfig, | ||
| }; | ||
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| declare export type ParseArgsConfig = { | ||
| strict?: boolean, | ||
| allowPositionals?: boolean, | ||
| tokens?: boolean, | ||
| options?: ParseArgsOptionsConfig, | ||
| args?: string[], | ||
| }; | ||
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| declare type ParsedResults = { | ||
| values: { | ||
| [longOption: string]: void | string | boolean | Array<string | boolean>, | ||
| }, | ||
| positionals: string[], | ||
| ... | ||
| }; | ||
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| declare export function parseArgs(config: ParseArgsConfig): ParsedResults; | ||
| } |
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| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow strict | ||
| * @format | ||
| * @oncall react_native | ||
| */ | ||
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| export {default as createDevMiddleware} from './createDevMiddleware'; |
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| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow | ||
| * @format | ||
| * @oncall react_native | ||
| */ | ||
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| const path = require('path'); | ||
| const {PACKAGES_DIR} = require('./build'); | ||
| const {buildConfig, getBabelConfig} = require('./config'); | ||
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| let isRegisteredForMonorepo = false; | ||
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| /** | ||
| * Calling this function enables all Node.js packages to run from source when | ||
| * developing in the React Native repo. | ||
| * | ||
| * A call should located in each entry point file in a package (i.e. for all | ||
| * paths in "exports"), inside a special `if` condition that will be compiled | ||
| * away on build. | ||
| * | ||
| * if (!process.env.BUILD_EXCLUDE_BABEL_REGISTER) { | ||
| * require('../../../scripts/build/babel-register').registerForMonorepo(); | ||
| * } | ||
| */ | ||
| function registerForMonorepo() { | ||
| if (isRegisteredForMonorepo) { | ||
| return; | ||
| } | ||
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| for (const [packageName, {target}] of Object.entries(buildConfig.packages)) { | ||
| if (target === 'node') { | ||
| registerPackage(packageName); | ||
| } | ||
| } | ||
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| isRegisteredForMonorepo = true; | ||
| } | ||
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| function registerPackage(packageName /*: string */) { | ||
| const packageDir = path.join(PACKAGES_DIR, packageName); | ||
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| require('@babel/register')({ | ||
| ...getBabelConfig(packageName), | ||
| only: [packageDir], | ||
| }); | ||
| } | ||
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| module.exports = {registerForMonorepo}; |
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