Sign-up action creator using Firebase Auth

auth.js

import { SIGNUP_SUCCESS, SIGNUP_ERROR } from "./actionTypes";
import firebase from "../../services/firebase";

// Signing up with Firebase
export const signup = (email, password) => async dispatch => {
  try {
    firebase
      .auth()
      .createUserWithEmailAndPassword(email, password)
      .then(dataBeforeEmail => {
        firebase.auth().onAuthStateChanged(function(user) {
          user.sendEmailVerification();
        });
      })
      .then(dataAfterEmail => {
        firebase.auth().onAuthStateChanged(function(user) {
          if (user.emailVerified) {
            // Email is verified
            dispatch({
              type: SIGNUP_SUCCESS,
              payload:
                "Your account was successfully created! Now you need to verify your e-mail address, please go check your inbox."
            });
          } else {
            // Email is not verified
            dispatch({
              type: SIGNUP_ERROR,
              payload:
                "Something went wrong, we couldn't create your account. Please try again."
            });
          }
        });
      })
      .catch(function(error) {
        dispatch({
          type: SIGNUP_ERROR,
          payload:
            "Something went wrong, we couldn't create your account. Please try again."
        });
      });
  } catch (err) {
    dispatch({
      type: SIGNUP_ERROR,
      payload:
        "Something went wrong, we couldn't create your account. Please try again."
    });
  }
};