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pffigueiredo/IsUnion.ts

Last active March 6, 2023 16:55
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Type to figure out if it's an union
Raw
IsUnion.ts
// When conditional types act on a generic type, they become distributive when given a union type
// So `("a" | "b") extends any` it's actually `"a" extends any | "b" extends any`
type IsUnion<T, C = T> = T extends C ? ([C] extends [T] ? false : true) : never;
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