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index.d.ts
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index.d.ts
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export type IsTuple<Tuple extends any[]> = {
empty: true
nonEmpty: ((...p: Tuple) => any) extends (
p1: infer First,
...p: infer Rest
) => any
? IsTuple<Rest>
: false
infinite: false
}[Tuple extends []
? 'empty'
: Tuple extends (infer Element)[]
? Element[] extends Tuple
? 'infinite'
: 'nonEmpty'
: never]
export type TupleToUnion<T> = T extends (infer E)[] ? E : never
export type UnionPop<U> = ((U extends any
? (k: (x: U) => void) => void
: never) extends (k: infer I) => void
? I
: never) extends { (a: infer A): void }
? A
: never
export type TuplePrepend<T extends any[], E> = ((
a: E,
...r: T
) => void) extends (...r: infer R) => void
? R
: never
type UnionToTupleRecursively<Union, Result extends any[]> = {
1: Result
0: UnionToTupleRecursively<
Exclude<Union, UnionPop<Union>>,
TuplePrepend<Result, UnionPop<Union>>
>
}[[Union] extends [never] ? 1 : 0]
export type UnionToTuple<U> = UnionToTupleRecursively<U, []>
type UnionToTupleWithMapRecursively<
Union extends string | number | symbol,
Map extends { [k in Union]: any },
Result extends any[]
> = {
1: Result
0: UnionToTupleWithMapRecursively<
Exclude<Union, UnionPop<Union>>,
Map,
TuplePrepend<Result, Map[UnionPop<Union>]>
>
}[[Union] extends [never] ? 1 : 0]
export type UnionToTupleWithMap<
U extends string | number | symbol,
Map extends { [k in any]: any }
> = UnionToTupleWithMapRecursively<U, Map, []>
export type TupleMap<
T extends any[],
Map extends { [k in any]: any }
> = UnionToTupleWithMap<TupleToUnion<T>, Map>