ArkTs怎么根据模版new对象返回

import { Type } from "class-transformer"; 
import "reflect-metadata" 
export class B { 
  constructor() { 
  } 
} 
export class A { 
  type: string = 'b' 
  @Type(() => A,myDiscriminator()) 
  components?: B[] 
} 
export function myDiscriminator(): ESObject { 
  return { 
    keepDiscriminatorProperty: true, 
    discriminator: { 
      property: 'type', 
      subTypes: [ 
        { value: B, name: 'b' }, 
      ], 
    } 
  } 
}