function deepClone(obj) {
  return new Promise(function(resolve, reject) {
    var { port1, port2 } = new MessageChannel();
    port1.onmessage = function(e) {
      resolve(e.data);
    };
    port2.postMessage(obj);
  });
}
var a = { a: 1 };

deepClone(a).then(e => console.log(a == e));

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