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9286 - FirstUniqueCharIndex #30863

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leejaehyup opened this issue Nov 23, 2023 · 0 comments

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leejaehyup commented Nov 23, 2023

type StringToUnion<S extends string, V extends any[] = []> = S extends `${infer First}${infer Rest}`
  ? StringToUnion<Rest, [...V, First]>
  : V[number];

type FirstUniqueCharIndex<S extends string, T extends unknown[] = []> = S extends `${infer F}${infer Rest}`
  ? F extends StringToUnion<Rest> | T[number]
    ? FirstUniqueCharIndex<Rest, [...T, F]>
    : T['length']
  : -1;

leejaehyup added answer en labels

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