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dannyrb/01-get-function-return-type.solution.ts

Created December 12, 2024 15:36
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  1. dannyrb created this gist Dec 12, 2024.
    18 changes: 18 additions & 0 deletions 01-get-function-return-type.solution.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,18 @@
    export type Expect<T extends true> = T;

    export type Equal<X, Y> = (<T>() => T extends X ? 1 : 2) extends <
    T,
    >() => T extends Y ? 1 : 2
    ? true
    : false;

    const myFunc = () => {
    return "hello";
    };

    /**
    * How do we extract MyFuncReturn from myFunc?
    */
    type MyFuncReturn = ReturnType<typeof myFunc>;

    type tests = [Expect<Equal<MyFuncReturn, string>>];