Defining TypeScript callback type

Question

I\'ve got the following class in TypeScript:

class CallbackTest
{
    public myCallback;

    public doWork(): void
    {
        //doing some work...
               


        

Answer 1

You can use the following:

1. Type Alias (using type keyword, aliasing a function literal)
2. Interface
3. Function Literal

---

Here is an example of how to use them:

type myCallbackType = (arg1: string, arg2: boolean) => number;

interface myCallbackInterface { (arg1: string, arg2: boolean): number };

class CallbackTest
{
    // ...

    public myCallback2: myCallbackType;
    public myCallback3: myCallbackInterface;
    public myCallback1: (arg1: string, arg2: boolean) => number;

    // ...

}