The problem is that Promise.all stopped infering tuple types. Promise.all([() =>... | Hacker News

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		graup on Nov 6, 2019 \| parent \| context \| favorite \| on: TypeScript 3.7 The problem is that Promise.all stopped infering tuple types. Promise.all([() => A, () => B]) should be Promise<[A, B]> but is now Promise< (A \| B) [] >. This issue is being tracked here and a fix seems to be already in the making: https://github.com/microsoft/TypeScript/issues/33752 https://github.com/microsoft/TypeScript/pull/33707

SirensOfTitan on Nov 6, 2019 [–]

Yeah, thank you. I think it's questionable they shipped with this kind of regression present (especially having known about it 1 month before release), but easy fix just to override core types with the one in #33707.

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