Function defWeak

lib/web/polyfill.js:1686–1692

(that, key, value)

  }, collectionMethods);
  
  function defWeak(that, key, value){
    if(isFrozen(assertObject(key)))leakStore(that).set(key, value);
    else {
      has(key, WEAK) || hidden(key, WEAK, {});
      key[WEAK][that[UID]] = value;
    } return that;
  }
  function leakStore(that){
    return that[LEAK] || hidden(that, LEAK, new Map)[LEAK];
  }