My firebase elemental operations

firebase.js

import * as firebase from 'firebase'

if (!firebase.apps.length) {
  firebase.initializeApp({
    apiKey: 'your_api_key',
    authDomain: 'your_auth_domain',
    databaseURL: 'your_database_url',
    projectId: 'your_project_ir',
    storageBucket: 'your_storage_bucket',
    messagingSenderId: 'your_messaging_sender_id'
  })
}

global.firebase = firebase

export const uploadImage = async ({key, ref, image}) => {
  try {
    const storage = firebase.storage()
    const uploadTask = storage
      .ref(ref)
      .putString(image, 'data_url')

    const imageResult = await new Promise((resolve, reject) => {
      uploadTask.on(
        'state_changed',
        snapshot => true,
        reject,
        () => resolve(uploadTask.snapshot.downloadURL)
      )
    })

    return imageResult
  } catch (e) {
    throw e
  }
}

export const generateDbKey = ref => {
  const database = firebase.database()
  return database.ref(ref).push().key
}

export const updateDataByKey = async ({key, ref, data}) => {
  try {
    const database = firebase.database()
    const updatedData = await database.ref(ref).update(data)
    return updatedData
  } catch (e) {
    throw e
  }
}

export const fetchDataByRef = (ref, cb) => {
  const database = firebase.database()
  const dataRef = database.ref(ref)

  dataRef.on('value', snapshot => {
    const payload = snapshot.val()
    if (payload !== null) cb(payload)
  })
}

export const findByKey = async ref => {
  try {
    const database = firebase.database()
    const dataRef = database.ref(ref)
    const response = await dataRef.once('value')
    const itExist = response.val()
    if (itExist) return itExist
    else throw new Error('Data not exist')
  } catch (e) {
    throw e
  }
}

export default firebase