How to flip a sprite in Phaser 3

For a long time I was using this.sprite.scaleX=-1 like I learned to do in ActionScript 3. The trouble is, if you have scaled your sprite, you need to do a little more maths. The flipX and flipY make everything much cleaner and much easier to flip a sprite in Phaser 3

class SceneMain extends Phaser.Scene {
    constructor() {
        super('SceneMain');
    }
    preload()
    {
    	this.load.image("duck", "images/duck.png");
    }
    create() {
        
        let duck1 = this.add.image(150, 150, "duck");
        let duck2 = this.add.image(350, 150, "duck");
        //
        //
        duck2.flipX=true;
    }
    update() {}
}