> If you want a special Promise (subclass or extended), you should not use async function since it casts the return value to a standard Promise
Right, there was a proposal that let you override how await works ( https://github.com/jhusain/compositional-functions) but I don't think it's currently actively persued (Jafar, feel free to correct me here). > If you want to return a promise and attach callbacks to it (not returning promise that spawns by then), you should not use async This is also correct. > it’s quite hard to determines if one method is actual async (with Promise) or sync (immediately return values), so I may preferr to mark all async function async for better read experience I don't think the distinction is correct. For the consumer - it is irrelevant if a function is async or just returns a promise. If you're writing an API and your function _sometimes_ return promises it is best to make them always return promises - more generally if a function is sometimes asynchronous (with callbacks too) it should always be asynchronous. > Never write return await xxx;, it seems useless either xxx is a promise or not Yes, unless of course you're also doing other things inside the function. > Anyway this is not an issue about spec itself, it’s more like an open discussion, thanks for reply :) Correct - I'm in no position to tell you what you can and cannot do but in the future I think it is best to ask these questions in Stack Overflow, IRC and on discussion groups. If you have issues about style, usage or anything else that is not the spec it is best to keep them off esdiscuss which is quite a noisy list anyway :) Feel free to send me an email (rather than the whole list) if you have other issues with `async` that are not spec related. Cheers.
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