SetTimeout

Test.js

function waitfunction() {
    var a = 5000 + new date().gettime();
    while (new date() < a){}
    console.log('waitfunction() context will be popped after this line');
}

const bar = () => {
  setTimeout(() => {
    console.log('timeout fired')
  }, 0) // execute now

  console.log('before')
  waitfunction();
  console.log('after')
}