How to traverse entire tree via array.prototype.reduce?

Question

JavaScript

It is necessary to traverse the entire tree and change the name of the keys, from one name to another. My function changes name to key everywhere except for the last element of the array with the name "Tom"

const data = [
    {
    name: 'Stas',
    age: 40,
    children: []
  },
  {
    name: 'Pavel',
    age: 40,
    children: [
    {
      name: 'Dmitri',
      age: 20,
      children:[]	
    },
    {
      name: 'Sasha',
      age: 15,
      children:[
                {
          name:'Alexey',
          age: 34,
          children:[]
        }
      ]
    }
    
    ]
  },
    {
    name: 'Tom',
    age: 22,
    cildren:[
            {
        name: 'Hack',
        age: 44,
        children:[]
      },
        {
        name: 'Hack',
        age: 44,
        children:[]
      }
                ]
    
  }


] 
const traversal= arr => 
  (arr || []).reduce((acc,cur,ind,arr)=>{
  if(cur.children === undefined){
  return acc
  } else if(cur.children.length){
    acc = [...acc, {key: cur.name, age: cur.age, children: traversal(cur.children)}]
        }else{
    acc = [...acc, {key: cur.name, age: cur.age, children: cur.children}]
  }
  return acc
},[])

Answer 1

const traversal = (arr, prevKey, key) => arr.map((o) => {
  const newObj = {
    ...o, 
    [key]: o[prevKey], 
    children: traversal(o.children, prevKey, key)
  }; 
  delete newObj[prevKey];
  return newObj;
});

const newArr = traversal(data, 'name', 'key');

PS your code doesn't work due to a typo in the property name in the last object