TypeScript · Senior · Question 43 of 75

How do you type a `Promise.all`-like function over a tuple of promises?

✓Correct answer: A generic tuple [...T] and a mapped type with Awaited<T[K]>
2An array Promise<any>[] and a result Promise<any[]>
3One generic T for all promises and Promise<T>

Explanation

[...T] hints to infer a tuple rather than an array, and the homomorphic mapped type unwraps each element: all([fetchUser(), fetchPosts()]) → Promise<[User, Post[]]>. Versions with any or a single T lose positional types.

How do you type a `Promise.all`-like function over a tuple of promises?

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How do you type a Promise.all-like function over a tuple of promises?

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How do you type a `Promise.all`-like function over a tuple of promises?