mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Rubén Norte
5c2b9eda69
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/52777 Changelog: [internal] This significantly speeds up test execution in Fantom (around 2x in OSS and 6x at Meta) by starting a Metro server before all tests runs and reusing it across all tests to build test bundles, instead of spinning up a new Metro instance every time we run each test. The architecture change (also considering the previous change in buck prebuilds) looks like this: {F1980689532} This is how is impacts execution times (compared to the baseline): * OSS * Before: 62s {F1980564286} * After: 30s (**2x faster**) {F1980564265} Reviewed By: andrewdacenko Differential Revision: D78741903 fbshipit-source-id: b209f88925e49cc2a2067e8df9b7fa9a29b4c8d2
59 lines
1.5 KiB
JavaScript
59 lines
1.5 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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* @flow strict-local
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* @format
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*/
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import {isOSS, validateEnvironmentVariables} from '../EnvironmentOptions';
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import build from './build';
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import Metro from 'metro';
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import path from 'path';
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export default async function globalSetup(
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globalConfig: {...},
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projectConfig: {...},
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): Promise<void> {
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process.env.__FANTOM_RUN_ID__ ??= `run-${Date.now()}`;
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validateEnvironmentVariables();
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await startMetroServer();
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if (!isOSS) {
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await build();
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}
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}
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async function startMetroServer() {
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const metroConfig = await Metro.loadConfig({
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config: path.resolve(__dirname, '..', '..', 'config', 'metro.config.js'),
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});
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// We need to reuse the same port across runs because can only set environment
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// variables for workers in the first one.
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// $FlowExpectedError[cannot-write]
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metroConfig.server.port =
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process.env.__FANTOM_METRO_PORT__ != null
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? Number(process.env.__FANTOM_METRO_PORT__)
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: // Any available port
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0;
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const server = await Metro.runServer(metroConfig, {
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waitForBundler: true,
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watch: true,
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});
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if (process.env.__FANTOM_METRO_PORT__ == null) {
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process.env.__FANTOM_METRO_PORT__ = String(
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server.httpServer.address().port,
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);
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}
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// $FlowExpectedError[prop-missing]
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globalThis.__METRO_SERVER__ = server;
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}
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