Typescript: How to define type for a function callback (as any function type, not universal any) used in a method parameter

Question

Currently I have type definition as:

interface Param {
    title: string;
    callback: any;
}

I need something like:

inter         


        

Answer 1

Hopefully, this will help...

interface Param {
    title: string;
    callback: (error: Error, data: string) => void;
}

Or in a Function

let myfunction = (title: string, callback: (error: Error, data: string) => void): string => {

    callback(new Error(`Error Message Here.`), "This is callback data.");
    return title;

}