type-challenges-solutions/en/medium-tuple-to-nested-object

[utterances-bot]

Tuple to Nested Object

This project is aimed at helping you better understand how the type system works, writing your own utilities, or just having fun with the challenges.

https://ghaiklor.github.io/type-challenges-solutions/en/medium-tuple-to-nested-object.html

[zcfan]

TypeScript 4.7 allows "extends Constraints on infer Type Variables"
https://devblogs.microsoft.com/typescript/announcing-typescript-4-7/#extends-constraints-on-infer-type-variables

type TupleToNestedObject<T, U> = T extends [infer Head extends string, ...infer Tail]
  ? { [P in Head]: TupleToNestedObject<Tail, U> }
  : U

type-challenges/type-challenges#16959 (comment)