Save user custom data after signup with firebase

user-signup.js

// Users collection
const usersRef = firebase.firestore().collection('users');

// User signup with email and password
firebase.auth().createUserWithEmailAndPassword(email, password)
  .then(async (credential) => {
    const user = {
      uid: credential.uid,
      // Custom data
      name,
      nickname,
      age,
    };
    
    // Create a new document on users collection with credential UID
    usersRef.doc(credential.uid).set(user)
      .then(() => {
        // User document created successfully
      })
      .catch(() => {
        // Error when creating user document
      });
  })
  .catch((error) => {
    // Error when create credential - invalid email
    if (error.code === 'auth/invalid-email') {
    }
  
    // Error when create credential - email already registered
    if (error.code === 'auth/email-already-in-use') {
    }
  
    // See all error codes on https://firebase.google.com/docs/reference/js/firebase.auth.Auth#sign-inwith-email-and-password
  });