将对象数组转换/转换为父接口对象接口在typescript中扩展的正确方法是什么？

interface ParentInterface {
  commonProperty: string;
  commonMethod(): void;
}

interface ChildInterface extends ParentInterface {
  childProperty: number;
  childMethod(): void;
}

const objectsArray: ChildInterface[] = [
  { commonProperty: "foo", commonMethod: () => {}, childProperty: 123, childMethod: () => {} },
  { commonProperty: "bar", commonMethod: () => {}, childProperty: 456, childMethod: () => {} }
];

const parentObjectsArray: ParentInterface[] = objectsArray.map(obj => obj as ParentInterface);