How to use the three-nebula.ScreenZone function in three-nebula

const emitter = new Emitter();

  return emitter
    .setRate(new Rate(new Span(5, 7), new Span(0.01, 0.02)))
    .setInitializers([
      new Mass(1),
      new Life(2),
      new Body(createSprite()),
      new Radius(80),
      new RadialVelocity(200, new Vector3D(0, 0, -1), 0),
    ])
    .setBehaviours([
      new Alpha(1, 0),
      new Color(colorA, colorB),
      new Scale(1, 0.5),
      new CrossZone(new ScreenZone(camera, renderer), 'dead'),
      new Force(0, 0, -20),
    ])
    .emit();
};

return emitter
    .setRate(new Rate(new Span(34, 48), new Span(0.2, 0.5)))
    .addInitializers([
      new Mass(1),
      new Radius(new Span(10, 20)),
      position,
      new Life(5, 10),
      new Body(createSnow()),
      new RadialVelocity(0, new Vector3D(0, -1, 0), 90),
    ])
    .addBehaviours([
      new RandomDrift(10, 1, 10, 0.05),
      new Rotate('random', 'random'),
      new Gravity(2),
      new CrossZone(new ScreenZone(camera, renderer, 20, '234'), 'dead'),
    ])
    .setPosition({ y: 800 })
    .emit();
};