Create Animation Without Frame Names

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

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.atlas('zombie', 'assets/tests/zombie-no-pivot.png', 'assets/tests/zombie-no-pivot.json');
    }

    create ()
    {
        //  Here we just pass the texture atlas key to `create` and it will extract all frames
        //  from within it, numerically sorting them for the animation.
        this.anims.create({
            key: 'walk',
            frames: 'zombie',
            frameRate: 12,
            repeat: -1
        });

        this.add.sprite(400, 300).play('walk');
    }
}

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

const game = new Phaser.Game(config);