Asynchronous stack traces: why await beats Promise#then() · Mathias Bynens

Compared to using promises directly, not only can async and await make code more readable for developers — they enable some interesting optimizations in JavaScript engines, too! This write-up is about one such optimization involving stack traces for asynchronous code. The fundamental difference between await and vanilla promises is that await X() suspends execution of the current function, while p

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PromiseチェーンよりもAsync/Awaitの方がスタックトレースがキレイ。 Transpileはまあ問題に成る