PG Pooling with express

app.js

const db = require('./db');
const express = require('express')
const app = express()

app.get('/', (req, res) => res.send('Hello World!'))

db.init()
  // after init
  .then(() => app.listen(3000, () => console.log('Example app listening on port 3000!')))

db.js

const {Pool} = require('pg');
let pool = undefined;

const init = () =>
  creds
    .getCreds('thunder_aurora')
    .then(dbCreds => 
      new Pool({
        user: dbCreds.username,
        host: dbCreds.host,
        database: dbCreds.dbname,
        password: dbCreds.password
      })
     )
    .then(newPool => pool = newPool); 

const query = (text, params) => pool.query(text, params);

module.exports = {
  init,
  query,
};