Camera Smoothed Key Control

class Example extends Phaser.Scene
{
    constructor ()
    {
        super();
    }

    preload () 
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.image('grid', 'assets/pics/uv-grid-diag.png');
    }

    create () 
    {
        //  The grid image is 1024 x 1024, let's draw 4 of them (2 by 2)
        this.add.image(0, 0, 'grid').setOrigin(0);
        this.add.image(1024, 0, 'grid').setOrigin(0);
        this.add.image(0, 1024, 'grid').setOrigin(0);
        this.add.image(1024, 1024, 'grid').setOrigin(0);

        const cursors = this.input.keyboard.createCursorKeys();

        const controlConfig = {
            camera: this.cameras.main,
            left: cursors.left,
            right: cursors.right,
            up: cursors.up,
            down: cursors.down,
            zoomIn: this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.Q),
            zoomOut: this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.E),
            acceleration: 0.06,
            drag: 0.0005,
            maxSpeed: 1.0
        };

        this.controls = new Phaser.Cameras.Controls.SmoothedKeyControl(controlConfig);

        const cam = this.cameras.main;

        const gui = new dat.GUI();

        const help = {
            line1: 'Cursors to move',
            line2: 'Q & E to zoom'
        }

        const f1 = gui.addFolder('Camera');
        f1.add(cam, 'x').listen();
        f1.add(cam, 'y').listen();
        f1.add(cam, 'scrollX').listen();
        f1.add(cam, 'scrollY').listen();
        f1.add(cam, 'rotation').min(0).step(0.01).listen();
        f1.add(cam, 'zoom', 0.1, 2).step(0.1).listen();
        f1.add(help, 'line1');
        f1.add(help, 'line2');
        f1.open();
    }

    update (time, delta) 
    {
        this.controls.update(delta);
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    parent: 'game-container',
    width: 800,
    height: 600,
    backgroundColor: '#000000',
    scene: Example
};

const game = new Phaser.Game(config);