MVE.js

import * as functions from 'firebase-functions';
import cors from 'cors';

export const addFacilityStaff = functions.https.onRequest((req, res) =>
  cors({ origin: true })(req, res, () => {
    (async (req, res) => {
      try {
        console.log('0');
        // await - do nasty stuff
        res.send('Ok');
      } catch (e) {
        console.log(e);
        res.status(500).send(e);
      }
    })(req, res);
  })
);