Abort controller synchronous call test

abort-test.js

var controller = new AbortController();
fetch('/', { signal: controller.signal })
  .then(res => res.text())
  .then(text => console.log(text)); 

// busywait for a while, should keep the thread busy until the request
// completes.
let i = 0; while (i < 100000) { 
  i++; 
  console.log(i);
} 

controller.abort();

output.txt

... numbers ...

9994
9995
9996
9997
9998
9999
10000
undefined

index:1 Uncaught (in promise) DOMException: The user aborted a request.