18 lines
659 B
TypeScript
18 lines
659 B
TypeScript
declare namespace Util {
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/** convert a union to an intersection: X | Y | Z ==> X & Y & Z */
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type UnionToIntersection<T> = (T extends any ? (args: T) => any : never) extends (args: infer R) => any ? R : never;
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/** returns true if the type is a union otherwise false */
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type IsUnion<T> = [T] extends [UnionToIntersection<T>] ? false : true;
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type LastInUnion<T> = UnionToIntersection<T extends any ? (arg: T) => any : never> extends (arg: infer R) => any
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? R
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: never;
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type UnionToTuple<T, U = T> = [T] extends [never]
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? []
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: [LastInUnion<T>, ...UnionToTuple<Exclude<U, LastInUnion<T>>>];
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type Inter = UnionToTuple<'1' | '2'>;
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}
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