weak-value-retaining-path.js

// d8 --expose-gc --allow-natives-syntax --track-retaining-path weak-value-retaining-path.js

class SomeKey {
}

class Metadata {
  constructor() {
    this.large = new LargeObject();
  }
}

class LargeObject {
  constructor () {
    this.buffer = new Uint8Array(10 * 1024 * 1024);
  }
}

let key = new SomeKey();
const map = new WeakMap();

(() => {
  let meta = new Metadata();
  %DebugTrackRetainingPath(meta);
  map.set(key, meta);
})();

gc();