谁分享一下如何实现匿名内部类

export interface IVoiceRecordListener<T> { 
  onSuccess: (t: T) => void 
  onFailed: (code: string, reason: string) => void 
} 
 
let voiceRecordListenerInstance: IVoiceRecordListener<void> = { 
  onSuccess: () => { 
    console.log('success') 
  }, 
  onFailed: () => { 
    console.log('failed') 
  } 
}