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55 - Union to Intersection #18930

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CaoXueLiang opened this issue Nov 10, 2022 · 0 comments

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CaoXueLiang commented Nov 10, 2022 •

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// 1. 将Union类型变成函数的联合函数类型
type ToUnionFunction<T> = T extends unknown ? (arg: T) => void : never;

// 2. 联合函数的类型，怎么就变成了交叉参数的一个函数？
//    ts对应PR：https://github.com/Microsoft/TypeScript/pull/21496
type UnionToIntersection<U> = ToUnionFunction<U> extends (arg: infer Args) => void ? Args : never;

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