Couldn't return data after findByCreate by setDoc (React JS + Firebase)

Question

I'm implementing findOrCreate to return data created by setDoc() in Firestore + React JS. But it returns undefined.

Promise[[Prototype]]: Promise[[PromiseState]]: "fulfilled"[[PromiseResult]]: undefined

...
async findOrCreate(name: string, email: string, profileURL: string, userId: string) {
  const doc = await getDoc(this.doc(userId))
  const data = doc.data()
  if (data !== undefined) return
  const newData = await setDoc(this.doc(userId), {
    name, email, profileURL
  }).then((data) => {
    console.log('data', data)
    return data
  })
  console.log('newData', newData)
}
...

Answer 1

The setDoc() function just returns a Promise<void> and not document data. You can just console.log(data) as that's the data you are setting in document.