How to listen callback JS?

I have callback in interface:

interface {
  onLoad?: () => void;

}

I tried to catch this callback using this:

props.onLoad(() => this.mapLoaded = true);

But I get this error:

Expected 0 arguments, but got 1.

Answer

It’s hard to say for certain without more context, but you’re probably meant to assign to onLoad rather than call it:

props.onLoad = () => this.mapLoaded = true;

Typically, a callback is called by the object you’re passing the interface to, so that it can call back to your code when something happens (in this case, presumably when a map is loaded).