can anyone tell me if

File.writeBytes()

is async?

Depends on what you mean by async here.

When I check here I don't see that it is

It's a native method.

From async, I believe he means if the code is processed on main thread or background thread

Well there's probably buffering by the OS at least. But why does that matter?

Isn't he asking for that ?

i change permissions of the newly created file immediately after, so i’m worried it won’t be finished flushing the buffer

You don't need to worry about that, all of that is handled at a way lower level.

thanks