jest-leak-detector

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
})();

Changelog

28.1.3

Features

• [jest-leak-detector] Use native FinalizationRegistry when it exists to get rid of external C dependency (#12973)

Fixes

• [jest-changed-files] Fix a lock-up after repeated invocations (#12757)
• [@jest/expect-utils] Fix deep equality of ImmutableJS OrderedSets (#12977)
• [jest-mock] Add index signature support for spyOn types (#13013, #13020)
• [jest-snapshot] Fix indentation of awaited inline snapshots (#12986)

Chore & Maintenance

• [*] Replace internal usage of pretty-format/ConvertAnsi with jest-serializer-ansi-escapes (#12935, #13004)
• [docs] Update spyOn docs (#13000)