How to type js function with parameter in TypeScript?

Question

JavaScript

Given:

function myFunction() {
            //...
        }
myFunction.m = null;

ts compiler message:

Property 'm' does not exist on type '() => void'.

How to type js function with parameter in TypeScript?

Answer 1

Something like this:

interface MyFunction {
    (): void;
    m: any;
}

Also see https://www.typescriptlang.org/docs/handbook/decla...

Answer 2

This?

function add(x: number, y: number): number {
    return x + y;
}