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

26.6.1

Features

• [jest-runtime] Support named exports from CommonJS as named ES Module imports (#10673)
• [jest-validate] Add support for recursiveDenylist option as an alternative to recursiveBlacklist (#10236)

Fixes

• [expect] Fix objectContaining to work recursively into sub-objects (#10508)
• [jest-cli, jest-core, jest-config, jest-types] Fix --onlyFailures flag to work in non-watch mode (#10678)
• [jest-config] Fix for the jest.config.ts compiler to not interfere with tsconfig.json files (#10675)
• [jest-message-util] Update to work properly with Node 15 (#10660)
• [jest-mock] Allow to mock methods in getters (TypeScript 3.9 export) (#10156)