[moritzwarhier]

This could be solved by using for..of in an asnyc function though.

It might look like surprsising behavior maybe, but putting the async keyword outside and looping without non-awaited callbacks is the only possible way to keep the semantics sound, no?

In other words, forEach would have to return a Promise too. That's where the function coloring rightfully annoys programmers to catch their mistakes, there are if cause also lint rules for this.

AFAIK there are two active proposals that aim to provide this natively (and additonaly enable working with lazy and/or infinite iterators or generator functions):

AsyncIterator and tc39/proposal-async-iterator-helpers