Make an object with the same structure but modified values

const obj = {
  something: "...",
  somethingNested: {
    iLove: "...",
    typeSafety: "..."
  }
}

const recurse = (item: Object | string) => {
  if(typeof item !== 'string'){
    const keys = Object.keys(item);
    keys.forEach(key => recurse(item[key]));
    // I don't know how I should loop through the items in a way that would allow me to return the key and value correctly here 😭
  } else {
    // I don't know how to return the result to the right key here 😭
    return serialize(item)
  }
}