// 1. MessageChannel
(async () => {

  const structuredCloneAsync = value =>
    new Promise(resolve => {
      const { port1: inPort, port2: outPort } = new MessageChannel();
      outPort.onmessage = ({data: {value}}) => resolve(value);
      inPort.postMessage({value});
    });


  const original = { date: new Date(), number: Math.random() };
  original.self = original;

  console.time('Clone MessageChannel')
  const clone = await structuredCloneAsync(original);
  console.timeEnd('Clone MessageChannel')

  // different objects:
  console.assert(original !== clone);
  console.assert(original.date !== clone.date);

  // cyclical:
  console.assert(original.self === original);
  console.assert(clone.self === clone);

  // equivalent values:
  console.assert(original.number === clone.number);
  console.assert(Number(original.date) === Number(clone.date));

  console.log("Assertions complete - MessageChannel.");
})();

// 2. history
(() => {

  const structuredClone = obj => {
    const oldState = history.state;
    history.replaceState(obj, null);
    const clonedObj = history.state;
    history.replaceState(oldState, null);
    return clonedObj;
  };

  const original = { date: new Date(), number: Math.random() };
  original.self = original;

  console.time('Clone history')
  const clone = structuredClone(original);
  console.timeEnd('Clone history');


  // different objects:
  console.assert(original !== clone);
  console.assert(original.date !== clone.date);

  // cyclical:
  console.assert(original.self === original);
  console.assert(clone.self === clone);

  // equivalent values:
  console.assert(original.number === clone.number);
  console.assert(Number(original.date) === Number(clone.date));

  console.log("Assertions complete - history.");
})();

// 3. Notification
(() => {

  const structuredClone = obj => {
    const n = new Notification('', {data: obj, silent: true});
    n.onshow = n.close;
    return n.data;
  };

  const original = { date: new Date(), number: Math.random() };
  original.self = original;

  console.time('Clone Notification')
  const clone = structuredClone(original);
  console.timeEnd('Clone Notification');


  // different objects:
  console.assert(original !== clone);
  console.assert(original.date !== clone.date);

  // cyclical:
  console.assert(original.self === original);
  console.assert(clone.self === clone);

  // equivalent values:
  console.assert(original.number === clone.number);
  console.assert(Number(original.date) === Number(clone.date));

  console.log("Assertions complete - Notification.");
})();