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

27.5.1

Features

• [jest-config] Support comments in JSON config file (#12316)
• [pretty-format] Expose ConvertAnsi plugin (#12308)

Fixes

• [expect] Add type definitions for asymmetric closeTo matcher (#12304)
• [jest-cli] Load binary via exported API (#12315)
• [jest-config] Replace jsonlint with parse-json (#12316)
• [jest-repl] Make module importable (#12311 & #12315)

Chore & Maintenance

• [*] Avoid anonymous default exports (#12313)