Aquileo | chore(runtime): final pass for splitting up god class by SimenB · Pull Request #16088 · jestjs/jest

SimenB · 2026-05-03T11:44:14Z

Summary

Had Claude do a final pass to see if we could clarify code flow to make it more obvious. it had a few suggestions - all committed as separate PRs

Test plan

Green CI

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commit: 01b78b7

Copilot

Pull request overview

Refactors jest-runtime internals to make execution/test-lifecycle flow more explicit by extracting test lifecycle tracking into a dedicated TestState object, while also tightening a few internal call paths (mock dispatch, manual-mock resolution, CJS export analysis) and updating tests accordingly.

Changes:

Introduce TestState and thread it through Runtime, CjsLoader, EsmLoader, and JestGlobals to centralize “between tests” / “torn down” gating.
Update MockState to return {shouldMock, moduleID} from sync mock-decision APIs and reuse moduleID in mock dispatch; move generateMock into MockState.
Reshape CjsExportsCache construction + API to take options (incl. transformCache) and propagate importer context; cache Resolution.findManualMock; add ModuleMocker.clearMocksOnScope and use it in Runtime.resetModules.

Reviewed changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/jest-runtime/src/internals/syntheticBuilders.ts	Update CJS-as-ESM synthetic export analysis to pass importer into `CjsExportsCache`.
packages/jest-runtime/src/internals/cjsRequire.ts	Rename “Deps” shapes to “Options” and adjust constructors accordingly.
packages/jest-runtime/src/internals/automock.ts	Remove standalone automock helper module (logic relocated).
packages/jest-runtime/src/internals/tests/automock.test.ts	Remove tests for deleted automock module (coverage moved).
packages/jest-runtime/src/internals/tests/TestState.test.ts	Add unit tests for the new `TestState` lifecycle/gating behavior.
packages/jest-runtime/src/internals/tests/Resolution.test.ts	Add coverage for `findManualMock` behavior + caching; mock `graceful-fs.existsSync`.
packages/jest-runtime/src/internals/tests/ModuleRegistries.test.ts	Update test to match `ModuleRegistries` CJS registry API change.
packages/jest-runtime/src/internals/tests/ModuleExecutor.test.ts	Update type name used by tests (`ModuleExecutorOptions`).
packages/jest-runtime/src/internals/tests/MockState.test.ts	Update for new `{shouldMock, moduleID}` return shape; add `generateMock` tests.
packages/jest-runtime/src/internals/tests/JestGlobals.test.ts	Update to inject `TestState` instance instead of `getTestState` callback.
packages/jest-runtime/src/internals/tests/EsmLoader.test.ts	Update to inject `TestState` instance and validate torn-down gating.
packages/jest-runtime/src/internals/tests/CjsLoader.test.ts	Update to inject `TestState` instance and validate torn-down gating.
packages/jest-runtime/src/internals/tests/CjsExportsCache.test.ts	Update for new constructor/options + new `getExportsOf(from, modulePath)` signature.
packages/jest-runtime/src/internals/TestState.ts	New `TestState` implementation (lifecycle + gating helpers).
packages/jest-runtime/src/internals/Resolution.ts	Add manual-mock cache; factor mock resolution into cached wrapper + compute helper.
packages/jest-runtime/src/internals/ModuleRegistries.ts	Split “active” vs “internal” CJS registry accessors.
packages/jest-runtime/src/internals/ModuleExecutor.ts	Rename “Deps” interface to “Options” and adjust constructor param naming.
packages/jest-runtime/src/internals/MockState.ts	Return moduleID with sync mock decisions; move `generateMock` here.
packages/jest-runtime/src/internals/JestGlobals.ts	Replace `getTestState()` with `TestState`; cache environment globals snapshot.
packages/jest-runtime/src/internals/EsmLoader.ts	Replace test-state callbacks with `TestState`; thread moduleID into mock import path.
packages/jest-runtime/src/internals/CjsLoader.ts	Replace test-state callbacks with `TestState`; update CJS registry selection API.
packages/jest-runtime/src/internals/CjsExportsCache.ts	Convert to options-based construction; include transform cache; propagate importer to loaders.
packages/jest-runtime/src/index.ts	Wire new `TestState`; update mock dispatch to reuse moduleID; use `clearMocksOnScope`.
packages/jest-runtime/src/tests/runtime_require_module_or_mock.test.js	Add assertion that dispatch computes moduleID once per `requireModuleOrMock` call.
packages/jest-mock/src/index.ts	Add `ModuleMocker.clearMocksOnScope` helper used by runtime to clear global mocks.
packages/jest-mock/src/tests/index.test.ts	Add unit tests for `clearMocksOnScope`.
CHANGELOG.md	Add changelog entry documenting `jest-mock`’s new `clearMocksOnScope`.

Copilot

Pull request overview

Copilot reviewed 29 out of 29 changed files in this pull request and generated 3 comments.

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 29 out of 29 changed files in this pull request and generated 1 comment.

| datasource | package | from | to | | ---------- | ------- | ------ | ------ | | npm | jest | 30.3.0 | 30.4.0 | ## [v30.4.0](https://github.com/jestjs/jest/blob/HEAD/CHANGELOG.md#3040) ##### Features - `[babel-jest]` Support collecting coverage from `.mts`, `.cts` (and other) files ([#15994](jestjs/jest#15994)) - `[jest-circus, jest-cli, jest-config, jest-core, jest-jasmine2, jest-types]` Add `--collect-tests` flag to discover and list tests without executing them ([#16006](jestjs/jest#16006)) - `[jest-config, jest-runner, jest-worker]` Add `workerGracefulExitTimeout` config option to control how long workers are given to exit before being force-killed ([#15984](jestjs/jest#15984)) - `[jest-config]` Add support for `jest.config.mts` as a valid configuration file ([#16005](jestjs/jest#16005)) - `[jest-config, jest-core, jest-reporters, jest-runner]` `verbose` and `silent` can now be set per-project; the project-level value overrides the global value for that project's tests ([#16133](jestjs/jest#16133)) - `[@jest/fake-timers]` Accept `Temporal.Duration` in `jest.advanceTimersByTime()` and `jest.advanceTimersByTimeAsync()` ([#16128](jestjs/jest#16128)) - `[@jest/fake-timers]` Accept `Temporal.Instant` and `Temporal.ZonedDateTime` in `jest.setSystemTime()` and `useFakeTimers({now})` ([#16128](jestjs/jest#16128)) - `[@jest/fake-timers]` Support faking `Temporal.Now.*` ([#16131](jestjs/jest#16131)) - `[jest-mock]` Add `clearMocksOnScope(scope)` on `ModuleMocker` for clearing every mock function exposed on a scope object ([#16088](jestjs/jest#16088)) - `[jest-resolve]` Add `canResolveSync()` on `Resolver` so callers can detect when a user-configured resolver only exports an `async` hook ([#16064](jestjs/jest#16064)) - `[jest-runtime]` Use synchronous `evaluate()` for ES modules without top-level `await` on Node versions that support it (v24.9+), and prefer the synchronous transform path when a sync transformer is configured ([#16062](jestjs/jest#16062)) - `[jest-runtime]` Support `require()` of ES modules on Node v24.9+ ([#16074](jestjs/jest#16074)) - `[jest-runtime]` Validate TC39 import attributes (`with { type: 'json' }`) on ESM imports ([#16127](jestjs/jest#16127)) - `[@jest/transform]` Add `canTransformSync(filename)` on `ScriptTransformer` so callers can pick the sync vs async transform path ([#16062](jestjs/jest#16062)) - `[jest-util]` Add `isError` helper ([#16076](jestjs/jest#16076)) - `[pretty-format]` Support React 19 ([#16123](jestjs/jest#16123)) ##### Fixes - `[expect-utils]` Fix `toStrictEqual` failing on `structuredClone` results due to cross-realm constructor mismatch ([#15959](jestjs/jest#15959)) - `[@jest/expect-utils]` Prevent `toMatchObject`/subset matching from throwing when encountering exotic iterables ([#15952](jestjs/jest#15952)) - `[fake-timers]` Convert `Date` to milliseconds before passing to `@sinonjs/fake-timers` ([#16029](jestjs/jest#16029)) - `[jest]` Export `GlobalConfig` and `ProjectConfig` TypeScript types ([#16132](jestjs/jest#16132)) - `[jest-circus]` Prevent crash when `asyncError` is undefined for non-Error throws ([#16003](jestjs/jest#16003)) - `[jest-circus, jest-jasmine2]` Include `Error.cause` in JSON `failureMessages` output ([#15967](jestjs/jest#15967)) - `[jest-config]` Fix preset path resolution on Windows when the preset uses subpath `exports` ([#15961](jestjs/jest#15961)) - `[jest-config]` Allow `collectCoverage` and `coverageProvider` in project config without a validation warning ([#16132](jestjs/jest#16132)) - `[jest-config]` Project config validator now emits "is not supported in an individual project configuration" instead of "probably a typing mistake" for known global-only options ([#16132](jestjs/jest#16132)) - `[jest-environment-node]` Fix `--localstorage-file` warning on Node 25+ ([#16086](jestjs/jest#16086)) - `[jest-reporters]` Apply global coverage threshold to unmatched pattern files in addition to glob/path thresholds ([#16137](jestjs/jest#16137)) - `[jest-reporters, jest-runner, jest-runtime, jest-transform]` Fix coverage report not showing correct code coverage when using `projects` config option ([#16140](jestjs/jest#16140)) - `[jest-runtime]` Resolve `expect` and `@jest/expect` from the internal module registry so test-file imports share the same `JestAssertionError` as the global `expect` ([#16130](jestjs/jest#16130)) - `[jest-runtime]` Improve CJS-from-ESM interop: `__esModule`/Babel default unwrap, broader named-export coverage, and shared CJS singleton across importers ([#16050](jestjs/jest#16050)) - `[jest-runtime]` Load `.js` files with ESM syntax but no `"type":"module"` marker as native ESM ([#16050](jestjs/jest#16050)) - `[jest-runtime]` Extend the `.js`-with-ESM-syntax fallback to `require()` on Node v24.9+ - falls back to `require(esm)` when the CJS parser rejects ESM syntax ([#16078](jestjs/jest#16078)) - `[jest-runtime]` Fix deadlocks and double-evaluation in concurrent ESM and wasm imports ([#16050](jestjs/jest#16050)) - `[jest-runtime]` Fix error when `require()` is called after the Jest environment has been torn down ([#15951](jestjs/jest#15951)) - `[jest-runtime]` Fix missing error when `import()` is called after the Jest environment has been torn down ([#16080](jestjs/jest#16080)) - `[jest-runtime]` Fix virtual `unstable_mockModule` registrations not respected in ESM ([#16081](jestjs/jest#16081)) - `[jest-runtime]` Apply `moduleNameMapper` when resolving modules with `require.resolve()` and the `paths` option ([#16135](jestjs/jest#16135)) ##### Chore & Maintenance - `[@jest/fake-timers]` Upgrade `@sinonjs/fake-timers` ([#16139](jestjs/jest#16139)) - `[jest-runtime]` Use synchronous `linkRequests` / `instantiate` for ESM linking on Node v24.9+ ([#16063](jestjs/jest#16063))

| datasource | package | from | to | | ---------- | ------- | ------ | ------ | | npm | jest | 30.3.0 | 30.4.2 | ## [v30.4.2](https://github.com/jestjs/jest/blob/HEAD/CHANGELOG.md#3042) ##### Fixes - `[jest-runtime]` Fix named imports from CJS modules whose `module.exports` is a function with own-property exports ([#16150](jestjs/jest#16150)) ## [v30.4.1](https://github.com/jestjs/jest/blob/HEAD/CHANGELOG.md#3041) ##### Features - `[jest-config, jest-core, jest-runner, jest-schemas, jest-types]` Allow custom runner configuration options via tuple format `['runner-path', {options}]` ([#16141](jestjs/jest#16141)) ##### Fixes - `[jest-runtime]` Align CJS-from-ESM default export with Node: `module.exports` is always the ESM default, `__esModule` unwrapping is no longer applied ([#16143](jestjs/jest#16143)) ## [v30.4.0](https://github.com/jestjs/jest/blob/HEAD/CHANGELOG.md#3040) ##### Features - `[babel-jest]` Support collecting coverage from `.mts`, `.cts` (and other) files ([#15994](jestjs/jest#15994)) - `[jest-circus, jest-cli, jest-config, jest-core, jest-jasmine2, jest-types]` Add `--collect-tests` flag to discover and list tests without executing them ([#16006](jestjs/jest#16006)) - `[jest-config, jest-runner, jest-worker]` Add `workerGracefulExitTimeout` config option to control how long workers are given to exit before being force-killed ([#15984](jestjs/jest#15984)) - `[jest-config]` Add support for `jest.config.mts` as a valid configuration file ([#16005](jestjs/jest#16005)) - `[jest-config, jest-core, jest-reporters, jest-runner]` `verbose` and `silent` can now be set per-project; the project-level value overrides the global value for that project's tests ([#16133](jestjs/jest#16133)) - `[@jest/fake-timers]` Accept `Temporal.Duration` in `jest.advanceTimersByTime()` and `jest.advanceTimersByTimeAsync()` ([#16128](jestjs/jest#16128)) - `[@jest/fake-timers]` Accept `Temporal.Instant` and `Temporal.ZonedDateTime` in `jest.setSystemTime()` and `useFakeTimers({now})` ([#16128](jestjs/jest#16128)) - `[@jest/fake-timers]` Support faking `Temporal.Now.*` ([#16131](jestjs/jest#16131)) - `[jest-mock]` Add `clearMocksOnScope(scope)` on `ModuleMocker` for clearing every mock function exposed on a scope object ([#16088](jestjs/jest#16088)) - `[jest-resolve]` Add `canResolveSync()` on `Resolver` so callers can detect when a user-configured resolver only exports an `async` hook ([#16064](jestjs/jest#16064)) - `[jest-runtime]` Use synchronous `evaluate()` for ES modules without top-level `await` on Node versions that support it (v24.9+), and prefer the synchronous transform path when a sync transformer is configured ([#16062](jestjs/jest#16062)) - `[jest-runtime]` Support `require()` of ES modules on Node v24.9+ ([#16074](jestjs/jest#16074)) - `[jest-runtime]` Validate TC39 import attributes (`with { type: 'json' }`) on ESM imports ([#16127](jestjs/jest#16127)) - `[@jest/transform]` Add `canTransformSync(filename)` on `ScriptTransformer` so callers can pick the sync vs async transform path ([#16062](jestjs/jest#16062)) - `[jest-util]` Add `isError` helper ([#16076](jestjs/jest#16076)) - `[pretty-format]` Support React 19 ([#16123](jestjs/jest#16123)) ##### Fixes - `[expect-utils]` Fix `toStrictEqual` failing on `structuredClone` results due to cross-realm constructor mismatch ([#15959](jestjs/jest#15959)) - `[@jest/expect-utils]` Prevent `toMatchObject`/subset matching from throwing when encountering exotic iterables ([#15952](jestjs/jest#15952)) - `[fake-timers]` Convert `Date` to milliseconds before passing to `@sinonjs/fake-timers` ([#16029](jestjs/jest#16029)) - `[jest]` Export `GlobalConfig` and `ProjectConfig` TypeScript types ([#16132](jestjs/jest#16132)) - `[jest-circus]` Prevent crash when `asyncError` is undefined for non-Error throws ([#16003](jestjs/jest#16003)) - `[jest-circus, jest-jasmine2]` Include `Error.cause` in JSON `failureMessages` output ([#15967](jestjs/jest#15967)) - `[jest-config]` Fix preset path resolution on Windows when the preset uses subpath `exports` ([#15961](jestjs/jest#15961)) - `[jest-config]` Allow `collectCoverage` and `coverageProvider` in project config without a validation warning ([#16132](jestjs/jest#16132)) - `[jest-config]` Project config validator now emits "is not supported in an individual project configuration" instead of "probably a typing mistake" for known global-only options ([#16132](jestjs/jest#16132)) - `[jest-environment-node]` Fix `--localstorage-file` warning on Node 25+ ([#16086](jestjs/jest#16086)) - `[jest-reporters]` Apply global coverage threshold to unmatched pattern files in addition to glob/path thresholds ([#16137](jestjs/jest#16137)) - `[jest-reporters, jest-runner, jest-runtime, jest-transform]` Fix coverage report not showing correct code coverage when using `projects` config option ([#16140](jestjs/jest#16140)) - `[jest-runtime]` Resolve `expect` and `@jest/expect` from the internal module registry so test-file imports share the same `JestAssertionError` as the global `expect` ([#16130](jestjs/jest#16130)) - `[jest-runtime]` Improve CJS-from-ESM interop: `__esModule`/Babel default unwrap, broader named-export coverage, and shared CJS singleton across importers ([#16050](jestjs/jest#16050)) - `[jest-runtime]` Load `.js` files with ESM syntax but no `"type":"module"` marker as native ESM ([#16050](jestjs/jest#16050)) - `[jest-runtime]` Extend the `.js`-with-ESM-syntax fallback to `require()` on Node v24.9+ - falls back to `require(esm)` when the CJS parser rejects ESM syntax ([#16078](jestjs/jest#16078)) - `[jest-runtime]` Fix deadlocks and double-evaluation in concurrent ESM and wasm imports ([#16050](jestjs/jest#16050)) - `[jest-runtime]` Fix error when `require()` is called after the Jest environment has been torn down ([#15951](jestjs/jest#15951)) - `[jest-runtime]` Fix missing error when `import()` is called after the Jest environment has been torn down ([#16080](jestjs/jest#16080)) - `[jest-runtime]` Fix virtual `unstable_mockModule` registrations not respected in ESM ([#16081](jestjs/jest#16081)) - `[jest-runtime]` Apply `moduleNameMapper` when resolving modules with `require.resolve()` and the `paths` option ([#16135](jestjs/jest#16135)) ##### Chore & Maintenance - `[@jest/fake-timers]` Upgrade `@sinonjs/fake-timers` ([#16139](jestjs/jest#16139)) - `[jest-runtime]` Use synchronous `linkRequests` / `instantiate` for ESM linking on Node v24.9+ ([#16063](jestjs/jest#16063))

Jest 30.4.0's jest-runtime calls `_moduleMocker.clearMocksOnScope()` (added in PR jestjs/jest#16088), but react-native@0.81.5 still depends on jest-environment-node@^29.7.0, which provides an older ModuleMocker missing this method. The mismatch caused every Jest test in apps/backend and apps/mobile to fail with: TypeError: this._moduleMocker.clearMocksOnScope is not a function Add a top-level `overrides` entry pinning jest-environment-node to 30.4.0 so transitive consumers (notably react-native's jest preset) resolve a compatible TestEnvironment. Verified locally: mobile unit tests pass (44/44), and the Jest mocker error is gone in backend. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

github-actions · 2026-06-24T00:34:19Z

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.

SimenB added 9 commits May 3, 2026 13:10

extract test state

924d4ef

do not compute mock module id twice

05c8759

avoid boolean argument

a8aa29c

less callbacks in exports cache

2292ee6

move generateMock into MockState.ts

53b33fa

cache manual mock lookups

04fd1d6

lookup test globals from env only once

2925d5b

move "clear mocks on object" to jest-mock

b5a5b71

avoid empty from strings

0e67a17

Copilot AI review requested due to automatic review settings May 3, 2026 11:44

Copilot started reviewing on behalf of SimenB May 3, 2026 11:44 View session

Copilot AI reviewed May 3, 2026

View reviewed changes

Comment thread packages/jest-mock/src/index.ts Outdated

SimenB changed the title ~~extract test state~~ chore(runtime): final pass for splitting up god class May 3, 2026

SimenB added 3 commits May 3, 2026 13:55

fix ci

a32627f

address review

32de8db

stacks changed again

8743867

SimenB requested a review from Copilot May 3, 2026 11:58

Copilot started reviewing on behalf of SimenB May 3, 2026 12:01 View session

nope, need to keep old code

c24f5fd

Copilot AI reviewed May 3, 2026

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Comment thread packages/jest-runtime/src/internals/MockState.ts Outdated

Comment thread packages/jest-runtime/src/internals/MockState.ts Outdated

Comment thread packages/jest-runtime/src/internals/CjsExportsCache.ts Outdated

SimenB and others added 3 commits May 3, 2026 14:06

Potential fix for pull request finding

e341de9

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

another

790ee4e

same mock optimization for esm

7885962

SimenB requested a review from Copilot May 3, 2026 12:15

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Comment thread packages/jest-runtime/src/internals/Resolution.ts Outdated

SimenB added 2 commits May 3, 2026 14:24

windows path

01b78b7

address copilot comment

5e45970

SimenB merged commit f768319 into jestjs:main May 3, 2026
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SimenB deleted the jest-runtime-cleanups branch May 3, 2026 12:58

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chore(runtime): final pass for splitting up god class - #16088

chore(runtime): final pass for splitting up god class#16088
SimenB merged 18 commits into
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SimenB commented May 3, 2026

Summary

Test plan

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✅ Deploy Preview for jestjs ready!

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Pull request overview

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Pull request overview

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Pull request overview

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github-actions Bot commented Jun 24, 2026

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netlify Bot commented May 3, 2026 •
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pkg-pr-new Bot commented May 3, 2026 •
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