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d6cae440e3
Jest's default test sequencer sorts alphabetically, causing large test files (eg ReactDOMFloat-test.js at 9k lines, ReactHooksWithNoopRenderer-test.js at 4k lines) to cluster in shard 3/5. This made shard 3/5 average 117s vs 77s for other shards, a 52% slowdown. I'm using filesize as a rough proxy for number of tests. This custom sequencer sorts tests by file size and distributes large files evenly across all shards instead of clustering them together. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35458). * __->__ #35458 * #35459
43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
'use strict';
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module.exports = {
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globalSetup: require.resolve('./setupGlobal.js'),
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testSequencer: require.resolve('./sizeBalancedSequencer.js'),
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modulePathIgnorePatterns: [
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'<rootDir>/scripts/rollup/shims/',
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'<rootDir>/scripts/bench/',
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'<rootDir>/packages/eslint-plugin-react-hooks/',
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],
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transform: {
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'^.+babel-plugin-react-compiler/dist/index.js$': [
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'babel-jest',
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{
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configFile: require.resolve('../../babel.config-react-compiler.js'),
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},
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],
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'^.+\\.ts$': [
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'babel-jest',
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{configFile: require.resolve('../../babel.config-ts.js')},
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],
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'.(?!ts$)': require.resolve('./preprocessor.js'),
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},
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prettierPath: require.resolve('prettier-2'),
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setupFiles: [require.resolve('./setupEnvironment.js')],
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setupFilesAfterEnv: [require.resolve('./setupTests.js')],
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// Only include files directly in __tests__, not in nested folders.
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testRegex: '/__tests__/[^/]*(\\.js|\\.coffee|[^d]\\.ts)$',
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moduleFileExtensions: ['js', 'json', 'node', 'coffee', 'ts'],
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rootDir: process.cwd(),
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roots: ['<rootDir>/packages', '<rootDir>/scripts'],
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collectCoverageFrom: ['packages/**/*.js'],
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fakeTimers: {
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enableGlobally: true,
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legacyFakeTimers: true,
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},
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snapshotSerializers: [require.resolve('jest-snapshot-serializer-raw')],
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testEnvironment: '<rootDir>/scripts/jest/ReactJSDOMEnvironment',
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testRunner: 'jest-circus/runner',
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};
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