type-challenges-solutions/ru/medium-flatten

[utterances-bot]

Flatten

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/ru/medium-flatten.html

[bini1988]

type Flatten<T extends any[], A extends any[] = []> = T extends [infer H, ...infer L] 
    ? Flatten<L, H extends any[] ? [...A, ...Flatten<H>] : [...A, H]>  : A;