TS的Callback类型找不到怎么回事？

import dataPreferences from '@ohos.data.preferences';

const preferencesAPI=new class MyPreferencesAPI{
  private preferences :dataPreferences.Preferences
  init(data:dataPreferences.Preferences){
    this.preferences=data
  }
  on(callback: Callback<{
    key: string;
  }>){
    this.preferences.on("change",callback)
  }
}
export default preferencesAPI
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