[jest-haste-map] Use watchman suffix-set option for faster file indexing. (#11784)
[jest-cli] Adds a new config options snapshotFormat which offers a way to override any of the formatting settings which come with pretty-format. (#11654)
[jest-reporters] Expose the getSummary util (#11695).
[jest-resolver] Support node: prefix when importing Node core modules (#11331)

Fixes

[jest-each] Relaxed the validation to allow multibyte characters in headings (#11575)
[jest-environment-jsdom] Add support for userAgent option (#11773)
[jest-environment-node] Add Event and EventTarget to node global environment. (#11727)
[jest-mock] Fix spyOn to use Object.prototype.hasOwnProperty (#11721)
[jest-resolver] Add dependency on jest-haste-map (#11759)
[jest-types] Compat with @types/node v16 (#11645)

Chore & Maintenance

[docs] Correct expects.assertions documentation by adding async/await for asynchronous function.

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
})();

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Last updated on 27 Aug 2021

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