setTimeout is not working

setTimeout, setInterval and other interval built in methods do not work, even if I expose them in context.

console.log('start');
setTimeout(()=> {
     console.log('hello timeout');
 }, 2000);
 
 console.log('end');

output:

start
end

It is to be noted that when I add .bind(this) , then timeout works and breaks at that line saying .bind is not a function.

console.log('start');
setTimeout(()=> {
     console.log('hello timeout');
 }, 2000).bind(this);
 
 console.log('end');

output:

start
hello timeout
// and an error in console saying setTimeout(...).bind is not a function

[ahmadalibaloch]

I tried checking your suggestion vm.runInNewContext('code', { setTimeout: window.setTimeout }) but it doesn’t work. Custom setTimeout do work.

[ahmadalibaloch]

If you say that the iFrame is destroyed in which the code was running then how my custom implementation of setTimeout and setInterval is working.

const setTimeouts = [];
function customSetTimeout(cb, interval) {
  const now = window.performance.now();
  const index = setTimeouts.length;
  setTimeouts[index] = () => {
    cb();
  };
  setTimeouts[index].active = true;
  const handleMessage = (evt) => {
    if (evt.data === index) {
      if (window.performance.now() - now >= interval) {
        window.removeEventListener('message', handleMessage);
        if (setTimeouts[index].active) {
          setTimeouts[index]();
        }
      } else {
        window.postMessage(index, '*');
      }
    }
  };
  window.addEventListener('message', handleMessage);
  window.postMessage(index, '*');
  return index;
}

function customClearTimeout(setTimeoutId) {
  if (setTimeouts[setTimeoutId]) {
    setTimeouts[setTimeoutId].active = false;
  }
}

Even if I add customSetTimeout for 1 minute, it works

 const codeToEval = `console.log('start)
 var a = setTimeout(function() {
    console.log('setTimeout  async done');
 }, 10000);
 console.log('sync');`
 const sandbox = {
      setTimeout: customSetTimeout,
      clearTimeout: customClearTimeout,
    };
vm.runInNewContext(codeToEval, sandbox);