[sakex]

There is no preemption in Javascript. It is based on cooperative multitasking[1] (your await statements and non-blocking callback) which is the opposite of preemption.

[1]https://en.wikipedia.org/wiki/Cooperative_multitasking#:~:te....

[ndndjdueej]

As anyone who has done the old setTimeout(fn, 0) trick in the browser probably knows.

[Feathercrown]

They even created setImmediate(fn) for this purpose

[orlp]

If every line had an implicit await then it is indistinguishable from pre-emption, which I think is the point the person you're replying to is trying to make.