collision.js

    var collidables = new Collidables();

    function GameObject(){
        var x = 0;
        var y = 0;
        var width = 100;
        var height = 100;
        
        this.collidable = new Collidable({
            bounds: function(){
                return new BoundingBox(this.x,
                                        this.y,
                                        this.x + this.width,
                                        this.y + this.height);
            }
        });
        this.collidable.on("collide", function(){
            console.log("OUCH :'(");
        });
        this.powerUp = function(){
            this.collidable.ephemeral = true;
            setTimeout(function(){
                this.collidable.ephemeral = false;
            }, 2000);
        };
    }

    var obj = new GameObject();
    var obj2 = new GameObject();

    collidables.add(obj);
    collidables.add(obj2);

    collidables.collisions();
    // [obj, obj2]

    collidables.handle();
    // Send collide events to all collidables

    if(obj.collidable.isCollidingWith(obj2.collidable)){
        console.log("TERRIBLE THINGS JUST HAPPENED");
    }