How do you extend Phaser.Weapon?

[PixelProgrammer]

Hi there,

 I want to extend Phaser.Weapon so I can create my own custom weapons. 

I know that you extend groups by using 

Weapon.SingleBullet = function (game) {

    Phaser.Group.call(this, game, game.world, 'Single Bullet', false, true, Phaser.Physics.ARCADE);

    return this;

};

Weapon.SingleBullet.prototype = Object.create(Phaser.Group.prototype);
Weapon.SingleBullet.prototype.constructor = Weapon.SingleBullet;

But what about the weapons group? Are there any examples out there for this?

 

EDIT: I used 

Weapon.SingleBullet.prototype = Object.create(Phaser.Weapon.prototype);

and it seems to work. However, when I try to fire my bullet I get the following error

Cannot read property 'getFirstExists' of null
    at Pistol.Phaser.Weapon.fire (phaser.js:101053)

 

[samme]

Creating a Shoot-em-up Tutorial doesn't use Phaser.Weapon at all. The Weapon class in the tutorial extends Phaser.Group.

Phaser.Weapon is different. Make sure you're using only one or the other.