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andrekovac/TupleToUnion.ts

Created July 20, 2022 12:43
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Two ways to create a a TupleToUnion type in TypeScript
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TupleToUnion.ts
/**
* Two ways to create a a TupleToUnion type in TypeScript
*/
export type TupleToUnion<T extends unknown[]> = T[number];
export type TupleToUnion2<T extends unknown[]> = T extends [
infer U,
...infer Rest
]
? TupleToUnion2<Rest> | U
: never;
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See also the corresponding challenge in the type-challenges repo:

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