Help to understand how the Pointer object can be instantiated in phaser3

Hi,

i'm new to phaser 3 and would have some clarifying answers on the Calss Pointer here:

in particular:

• I want to create an Pointer instance using the following code:

  • var gun = new Pointer(manager,0);
    

     

I know that the "manager" argument refers to a InputManager object, but i don't understand how to create/configure it,

i tried this:

var manager = new InputManager(this, this);

but obtain the following error log:

ReferenceError: InputManager is not defined

Can someone help me on this problem?

Thanks!