Created
October 13, 2022 18:47
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TypeScript tuple types using non-type generic parameters
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type Ten<T extends any[]> = [...T, ...T, ...T, ...T, ...T, ...T, ...T, ...T, ...T, ...T] | |
type Tuple<T, N extends number> = | |
N extends 0 ? [] : | |
N extends 1 ? [T] : | |
N extends 2 ? [T,T] : | |
N extends 3 ? [T,T,T] : | |
N extends 4 ? [T,T,T,T] : | |
N extends 5 ? [T,T,T,T,T] : | |
N extends 6 ? [T,T,T,T,T,T] : | |
N extends 7 ? [T,T,T,T,T,T,T] : | |
N extends 8 ? [T,T,T,T,T,T,T,T] : | |
N extends 9 ? [T,T,T,T,T,T,T,T,T] : | |
`${N}` extends `${infer Rest extends number}0` ? [...Ten<Tuple<T, Rest>>] : | |
`${N}` extends `${infer Rest extends number}1` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 1>] : | |
`${N}` extends `${infer Rest extends number}2` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 2>] : | |
`${N}` extends `${infer Rest extends number}3` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 3>] : | |
`${N}` extends `${infer Rest extends number}4` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 4>] : | |
`${N}` extends `${infer Rest extends number}5` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 5>] : | |
`${N}` extends `${infer Rest extends number}6` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 6>] : | |
`${N}` extends `${infer Rest extends number}7` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 7>] : | |
`${N}` extends `${infer Rest extends number}8` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 8>] : | |
`${N}` extends `${infer Rest extends number}9` ? [...Ten<Tuple<T, Rest>>, ...Tuple<T, 9>] : | |
never; | |
type Mat4 = Tuple<number, 16> | |
type X = Tuple<number, 101> |
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