[expect] [BREAKING] Differentiate between MatcherContext MatcherUtils and MatcherState types (#13141)
[jest-circus] Add support for test.failing.each (#13142)
[jest-config] [BREAKING] Make snapshotFormat default to escapeString: false and printBasicPrototype: false (#13036)
[jest-config] [BREAKING] Remove undocumented collectCoverageOnlyFrom option (#13156)
[jest-environment-jsdom] [BREAKING] Upgrade to jsdom@20 (#13037, #13058)
[@jest/globals] Add jest.Mocked, jest.MockedClass, jest.MockedFunction and jest.MockedObject utility types (#12727)
[jest-mock] [BREAKING] Refactor Mocked* utility types. MaybeMockedDeep and MaybeMocked became Mocked and MockedShallow respectively; only deep mocked variants of MockedClass, MockedFunction and MockedObject are exported (#13123, #13124)
[jest-mock] [BREAKING] Change the default jest.mocked helper’s behavior to deep mocked (#13125)
[jest-snapshot] [BREAKING] Let babel find config when updating inline snapshots (#13150)
[@jest/test-result, @jest/types] [BREAKING] Replace Bytes and Milliseconds types with number (#13155)
[jest-worker] Adds workerIdleMemoryLimit option which is used as a check for worker memory leaks >= Node 16.11.0 and recycles child workers as required (#13056, #13105, #13106, #13107)
[pretty-format] [BREAKING] Remove ConvertAnsi plugin in favour of jest-serializer-ansi-escapes (#13040)
[pretty-format] Allow to opt out from sorting object keys with compareKeys: null (#12443)

Fixes

[jest-config] Fix testing multiple projects with TypeScript config files (#13099)
[@jest/expect-utils] Fix deep equality of ImmutableJS Record (#13055)
[jest-haste-map] Increase the maximum possible file size that jest-haste-map can handle (#13094)
[jest-runtime] Properly support CJS re-exports from dual packages (#13170)
[jest-snapshot] Make prettierPath optional in SnapshotState (#13149)
[jest-snapshot] Fix parsing error from inline snapshot files with JSX (#12760)
[jest-worker] When a process runs out of memory worker exits correctly and doesn't spin indefinitely (#13054)

Chore & Maintenance

[*] [BREAKING] Drop support for Node v12 and v17 (#13033)
[docs] Fix webpack name (#13049)
[docs] Explicit how to set n for --bail (#13128)
[docs] Update Enzyme URL (#13166)
[jest-leak-detector] Remove support for weak-napi (#13035)
[jest-snapshot] [BREAKING] Require rootDir as argument to SnapshotState (#13150)

Readme

Source

jest-leak-detector

Module for verifying whether an object has been garbage collected or not.

Internally creates a weak reference to the object, and forces garbage collection to happen. If the reference is gone, it meant no one else was pointing to the object.

Example

(async function () {
  let reference = {};
  let isLeaking;

  const detector = new LeakDetector(reference);

  // Reference is held in memory.
  isLeaking = await detector.isLeaking();
  console.log(isLeaking); // true

  // We destroy the only reference to the object.
  reference = null;

  // Reference is gone.
  isLeaking = await detector.isLeaking();
  console.log(isLeaking); // false
})();

FAQs

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Last updated on 25 Aug 2022

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