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> Now I run into situations where promises cascade up from a few async calls and affect every API built on top of them

Can you elaborate what you meant by that?

If you have a synchronous function that suddenly needs to do something asynchronous, then everything that uses that function needs to become async too.

http://journal.stuffwithstuff.com/2015/02/01/what-color-is-y...

Exactly, thanks.

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