E6 Async to ES7 Example

import express from 'express';
import schema from './data/schema';
import GraphGQLHTTP from 'express-graphql';

import {MongoClient} from 'mongodb';

let app = express();

app.use(express.static('public'));


/**
 * ES7 Async Await Function
 * Note: There is no callback on the ES7 version of 'let db ='. Await takes care of waiting for response 
 * and throwing its errors.
 * Wrap the code with the async method in the async function with the => and call it with '()' immediately after
 * because its an anonymous function or it wont do anything.
 */
(async () => {
	let db = await MongoClient.connect(process.env.MONGO_URL);

	app.use('/graphql', GraphGQLHTTP({
			schema: schema(db),
			graphiql: false
		}));

	app.listen(3000, () => console.log('Listening on port 3000'));
})();
	
/**
ES6 Async
*/
let db;

MongoClient.connect(process.env.MONGO_URL, (err, database) => {
	if (err) throw err;

	db = database;
	app.use('/graphql', GraphGQLHTTP({
		schema: schema(db),
		graphiql: false
	}));

	app.listen(3000, () => console.log('Listening on port 3000'));
});
/** https://app.pluralsight.com/player?course=react-apps-with-relay-graphql-flux&author=samer-buna&name=react-apps-with-relay-graphql-flux-m5&clip=1&mode=live */