How to use the babylonjs.HemisphericLight function in babylonjs

ShadowGenerator,
	DirectionalLight,
	Color4,
	CSG,
	Animation,
	AnimationEvent,
	Sound,
} from 'babylonjs';

import CANNON from 'cannon';
window.CANNON = CANNON;

const canvas = document.getElementById("stage");
const engine = new Engine(canvas, true);
const scene = new Scene(engine);
const light = new HemisphericLight("light", new Vector3(0, 3, 0), scene);
let started = false;
let renderScene = true;
let shift = 0;
light.intensity = 2.5;
const camera = new FreeCamera("FreeCamera",new Vector3(0, 4, -22), scene);
camera.setTarget(new Vector3(0, 1, 0));
const sphere = MeshBuilder.CreateSphere("ball", {
	diameter: 0.6
}, scene);
sphere.position.z = -17;
sphere.position.y = 0.7;
const boxes=[];

let sceneAnimations = [];
let currentBox;
// droping animation

10,
      BABYLON.Vector3.Zero(),
      this.scene
    );

    // This targets the camera to scene origin
    this.camera.setTarget(BABYLON.Vector3.Zero());

    // This attaches the camera to the canvas
    this.camera.attachControl(this.canvas, true);

    this.camera.setPosition(new BABYLON.Vector3(500, 400, -100));
    this.camera.useAutoRotationBehavior = true;

    // This creates a light, aiming 0,1,0 - to the sky (non-mesh)
    var light = new BABYLON.HemisphericLight(
      "global_light",
      new BABYLON.Vector3(0, 1, 0),
      this.scene
    );

    light.intensity = 0.7;
  }

initScene() {
    this.scene.clearColor = new BABYLON.Color3(0.7, 0.7, 0.7);
    // This creates and positions a free camera (non-mesh)
    this.camera = new BABYLON.ArcRotateCamera('camera', 0, 0, 10, BABYLON.Vector3.Zero(), this.scene);

    // This targets the camera to scene origin
    this.camera.setTarget(BABYLON.Vector3.Zero());

    // This attaches the camera to the canvas
    this.camera.attachControl(this.canvas, true);

    this.camera.setPosition(new BABYLON.Vector3(500, 400, -100));
    this.camera.useAutoRotationBehavior = true;

    // This creates a light, aiming 0,1,0 - to the sky (non-mesh)
    var light = new BABYLON.HemisphericLight('global_light', new BABYLON.Vector3(0, 1, 0), this.scene);

    light.intensity = 0.8;
  }

addLights() {
    const light = new HemisphericLight(
      'light',
      new Vector3(0, 1, 0),
      this._scene
    );
    light.intensity = 1;
  }

setCamera(){
        const camera = new BABYLON.ArcRotateCamera("camera", 0, 1, 20, BABYLON.Vector3.Zero(), this.scene);
        camera.setTarget(new BABYLON.Vector3(0, 4, 0));
        camera.setPosition(new BABYLON.Vector3(0, 5, 11))
        camera.attachControl(this.canvas, true);
        const light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), this.scene);
        light.intensity = 0.7;
        return camera;
    }

setCamera(){
        const camera = new BABYLON.ArcRotateCamera("camera", 0, 1, 20, BABYLON.Vector3.Zero(), this.scene);
        camera.setTarget(new BABYLON.Vector3(0, 4, 0));
        camera.setPosition(new BABYLON.Vector3(0, 6, 12))
        camera.attachControl(this.canvas, true);
        const light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), this.scene);
        light.intensity = 0.7;
        return camera;
    }