The answer is: no, it wont:

new Promise(function(resolve, reject) {
  setTimeout(() => {
    throw new Error("Whoops!");
  }, 1000);
}).catch(alert);

As said in the chapter, theres an implicit try..catch around the function code. So all synchronous errors are handled.

But here the error is generated not while the executor is running, but later. So the promise cant handle it.