arkTS 是否可以判断实例是某个接口的实例

export interface MainPoint { 
  imageX?:number 
  imageY?:number 
  isMainPoint():boolean 
} 
 
class ImagePoint implements MainPoint { 
  imageX?:number 
  imageY?:number 
  constructor(x:number,y:number) { 
    this.imageX = x 
    this.imageY = y 
  } 
  isMainPoint(): boolean { 
    return true 
  } 
}

let point:ImagePoint = new ImagePoint(0,0) 
if(point.isMainPoint()){ 
  console.log('this.point is instance of MainPoint') 
}