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js 多级嵌套数组对象 怎么转化成普通的数组对象?

vue 后端返回的数据如图,怎么让图中多级嵌套的数组对象改成一下格式:
image.png
需要改成以下格式:
image.png
请求各位大佬赐教 急急急!!!


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console.log(data
  .map(dep => {
    return dep.declareTypeDtos.map(dot => {
      dot.deptId = dep.deptId;
      dot.deptName = dep.deptName;
      return dot;
    });
  })
  .flat());

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