How to make a health bar in Phaser 3

Anyone who has ever made an RPG game knows how important health bars can be to a game. However, this technique can also be used for timer bars or loading progress. This uses Phaser’s built-in graphics class and uses no images.

class SceneMain extends Phaser.Scene {
    constructor() {
        super('SceneMain');
    }
    preload() {}
    create() {
        
        //make 3 bars
        let healthBar=this.makeBar(140,100,0x2ecc71);
        this.setValue(healthBar,100);


        let powerBar=this.makeBar(140,200,0xe74c3c);
        this.setValue(powerBar,50);


        let magicBar=this.makeBar(140,300,0x2980b9);
        this.setValue(magicBar,33);

    }
    makeBar(x, y,color) {
        //draw the bar
        let bar = this.add.graphics();

        //color the bar
        bar.fillStyle(color, 1);

        //fill the bar with a rectangle
        bar.fillRect(0, 0, 200, 50);
        
        //position the bar
        bar.x = x;
        bar.y = y;

        //return the bar
        return bar;
    }
    setValue(bar,percentage) {
        //scale the bar
        bar.scaleX = percentage/100;
    }
    update() {}
}