jest.config.js

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const testFileExtension = 'ts?(x)';

// Reassure runs only the performance tests, matched by the `.perf-test` suffix / `__perf__` folder (or the `.perf-local` suffix for local benchmarks),
// which it passes to Jest as `--testMatch`. We detect that from the test-runner argv so we can leave
// `performance` real for perf runs only: enabling Jest's modern fake timers globally also fakes
// `performance`, and React's Scheduler captures that (frozen) clock once at module load, which zeroes
// every React Profiler render duration — and thus every Reassure `[render]` measurement.
const isPerfTestRun = process.argv.some((arg) => /perf-(test|local)|__perf__/.test(arg));

// With `--coverage`, Jest also instruments every file matched by `collectCoverageFrom` that no test loaded, so
// untested files show up at 0%. Under `--shard=N/M` each shard would repeat that pass over all of `src/**`
// (~7k files, 10-60s per shard). Only the first shard emits the untested files, the others report just what
// their tests load. Codecov unions the per-shard reports, so the merged totals are unchanged.
const shardMatch = process.argv.map((arg) => /^--shard=(\d+)\/\d+$/.exec(arg)).find(Boolean);
const emitsUntestedFiles = !shardMatch || shardMatch[1] === '1';

module.exports = {
    preset: 'jest-expo',
    resolver: '<rootDir>/jest/resolver.ts',
    collectCoverageFrom: emitsUntestedFiles ? ['<rootDir>/src/**/*.{ts,tsx,js,jsx}', '!<rootDir>/src/**/__mocks__/**', '!<rootDir>/src/**/tests/**', '!**/*.d.ts'] : undefined,
    // Keeps the instrumented set identical to `collectCoverageFrom` above on the shards that skip it.
    coveragePathIgnorePatterns: ['/node_modules/', '<rootDir>/(?!src/)', '/__mocks__/', '<rootDir>/src/.*/tests/', '\\.d\\.ts$'],
    testMatch: [
        `<rootDir>/tests/ui/**/*.${testFileExtension}`,
        `<rootDir>/tests/unit/**/*.${testFileExtension}`,
        `<rootDir>/tests/actions/**/*.${testFileExtension}`,
        `<rootDir>/tests/navigation/**/*.${testFileExtension}`,
        `<rootDir>/?(*.)+(spec|test).${testFileExtension}`,
    ],
    transform: {
        // OXC + esbuild is native and stays fast without TurboFan, where Babel was measured as
        // roughly half of each Reassure measure job. The transformer sends test files, mocks and
        // node_modules to babel-jest itself, so `jest.mock` is still hoisted there.
        '^.+\\.[jt]sx?$': '<rootDir>/config/babel/oxcJestTransformer.js',
        '^.+\\.svg?$': 'jest-transformer-svg',
    },
    transformIgnorePatterns: [
        '<rootDir>/node_modules/(?!.*(react-native|expo|react-navigation|uuid|@shopify\/flash-list).*/)',
        // Prevent Babel from transforming worklets in this file so they are treated as normal functions, otherwise FormatSelectionUtilsTest won't run.
        '<rootDir>/node_modules/@expensify/react-native-live-markdown/lib/commonjs/parseExpensiMark.js',
    ],
    // tests/tooling/ covers .github/ and scripts/ and runs under `bun test` instead (see the `test:bun` npm
    // script), so those files import `bun:test` rather than Jest's globals. They aren't in testMatch above, and
    // this keeps them out even if a future testMatch entry broadens to all of tests/.
    testPathIgnorePatterns: ['<rootDir>/node_modules', '<rootDir>/tests/tooling/'],
    // .worktrees/ and .claude/worktrees/ hold parallel git worktrees a developer may check out locally.
    // Each one carries its own modules/hybrid-app/package.json, which trips
    // jest-haste-map's "duplicate package name" assertion. Skip them entirely.
    modulePathIgnorePatterns: ['<rootDir>/.worktrees/', '<rootDir>/.claude/worktrees/'],
    globals: {
        __DEV__: true,
        WebSocket: {},
        // Build-time define from config/rsbuild/rsbuild.common.ts. SkiaWebChart reads it when mounting CanvasKit.
        __CANVASKIT_WASM_URL__: '/canvaskit-test.wasm',
    },
    fakeTimers: {
        enableGlobally: true,
        // `nextTick` is never faked because Onyx notifies its subscribers on process.nextTick.
        // `performance` is left real only for perf runs (see isPerfTestRun above).
        doNotFake: isPerfTestRun ? ['nextTick', 'performance'] : ['nextTick'],
    },
    testEnvironment: 'jsdom',
    setupFiles: ['<rootDir>/jest/setup.ts', './node_modules/@react-native-google-signin/google-signin/jest/build/setup.js'],
    setupFilesAfterEnv: ['<rootDir>/jest/setupAfterEnv.ts', '<rootDir>/tests/perf-test/setupAfterEnv.ts'],
    // Restarts a worker between suites once it holds this much memory, so long-lived CI workers don't get OOM killed.
    workerIdleMemoryLimit: '2GB',
    cacheDirectory: '<rootDir>/.jest-cache',
    coverageReporters: ['json', 'lcov', 'text-summary'],
    moduleNameMapper: {
        '\\.(lottie)$': '<rootDir>/__mocks__/fileMock.ts',
        '^@lottiefiles/dotlottie-react$': '<rootDir>/__mocks__/@lottiefiles/dotlottie-react.tsx',
        '^group-ib-fp$': '<rootDir>/__mocks__/group-ib-fp.ts',
        '^parse-imports-exports$': '<rootDir>/node_modules/parse-imports-exports/index.cjs',
    },
};