Window.onload is not firing inside my stackblitz project

Question

I want to fire function call on window.onload event. But inside my stackblitz project this is not firing at all.

window.onload = function () {
  console.log('loading...');
};

You can check out the same inside stackblitz demo link here

I have to add this link of stackblitz code demo here because I am having issue with there. Can you suggest a way of correcting this? Thanks.