Determining the return type of TypeScript functions based on the return type of the passed functions

Is it wishful thinking to try and achieve the following?

I am aiming to create a function (let's call it function A) that will return the same type as a new function passed into its parameter.

For example:

export function test<T> ( arg:Function ):T {
    return arg;
}

function a():string {
    return 'a';
}

function b():number {
    return 0;
}

let aVal:string = test(a);
let bVal:number = test(b);

This approach can help in strongly typing responses and catching compile time errors.

Does anyone have any insights or thoughts on this concept?

** Please note: The code is put together quickly for demonstration purposes **

Cheers!

Answer №1

Do you like this alternative?

function example<S>(param: () => S): S {
    return param();
}

function x(): string {
    return 'x';
}

function y(): number {
    return 10;
}

let xVal: string = test(x);
let yVal: number = test(y);

Rather than utilizing the Function interface, we have specified param as a function that doesn't accept any arguments and returns something of type S. The specific type S can then be determined by the injected function.

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