Get Function Return Type

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

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>>];