JavaScript Is promise.then asynchronous or not? promise then asynchronous

It hangs because .then chains execute on the microtask queue, unlike e.g. setTimeout which executes on the main JavaScript event queue:

let sequence = Promise.resolve();
function fire() {
  setTimeout(fire); // doesn't hang
};
fire();

Most browsers empty the microtask queue completely at the tail of the current run-to-completion, and your code prevents it from ever emptying, stalling the main JavaScript event queue.

The browser isn't totally hung, since users can stop this out-of-control script after a while. How usable the browser feels during this period depends on whether the browser supports multiple processes or not. E.g. Firefox Developer Edition fares better than Firefox here, since dev edition uses multiple processes.

Answer:1

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