How to use async await in ie11

async await ie11.js

// Async await func 
async function getTimelineData() {
 var response = await fetch('/some-api-url')
  return response.json()
}

async function populateTimelineInit() {

  var data = await getTimelineData();
  new vis.DataSet(data);
}

populateTimelineInit();

// First we transpile code above:  https://babeljs.io/repl/  


/* After that we have to include 3 polyfills but before code is executed. So beside annoying code regenerator 
which is required for async await to work, we also need promise and fetch polyfill. 

    https://cdn.jsdelivr.net/npm/babel-regenerator-runtime@6.5.0/runtime.js:
    https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js: 
    https://cdnjs.cloudflare.com/ajax/libs/fetch/2.0.3/fetch.js:

That's all it's needed  :) */