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  | 'use strict'; 
 |  var collection = require('../internals/collection'); 
 |  var collectionWeak = require('../internals/collection-weak'); 
 |    
 |  // `WeakSet` constructor 
 |  // https://tc39.es/ecma262/#sec-weakset-constructor 
 |  collection('WeakSet', function (init) { 
 |    return function WeakSet() { return init(this, arguments.length ? arguments[0] : undefined); }; 
 |  }, collectionWeak); 
 |  
  |