return new Promise((resolve, reject) => {
   firebase.firestore()
   .collection("categories")
   .add(category)
   .then(data => resolve(data))
   .catch(err => reject(err)) 
 })

  constructor() {

    this.db = firebase.firestore();
  }

import * as firebase from "firebase";
import "firebase/firestore";
// tslint:disable-next-line:no-var-requires
const CONFIG = require("./data/config.json");

firebase.initializeApp(CONFIG.firebase);

export const auth = firebase.auth();
export const db = firebase.firestore();
// Because firebase.storage does not work in Node.js, check it exists so tests still pass
export const storageRef = firebase.storage && firebase.storage().ref();