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crutchcorn/loosen.ts

Created September 4, 2023 07:45
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loosen.ts
/**
* ["a", "b", "c"] => ["a" | "b" | "c", "a" | "b" | "c", "a" | "b" | "c"]
*
* Assumes keys are unique
*/
export type LoosenTuple<
Arr extends readonly any[],
OriginalArr extends readonly any[] = Arr,
> = Arr extends readonly [unknown, ...infer Tail]
? readonly [OriginalArr[number], ...LoosenTuple<Tail, OriginalArr>]
: readonly []
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