app.js

const express = require( 'express' )
const ENV = require( 'dotenv' ).config().parsed
const bodyParser = require( 'body-parser' )
const app = express()
const fs = require( 'fs' )
const PORT = ENV.NODE_ENV === 'production' ? ENV.PORT : ENV.DEV_PORT

app.set( 'views', './views' )
app.set( 'view engine', 'ejs' )

app.use( express.static( 'public' ) )
app.use( express.static( 'views' ) )
app.use( bodyParser.urlencoded( {
	extended: false
} ) )
app.use( bodyParser.json() )

app.get( '*', ( req, res, next ) => {

	const CSS_FILE = './public/styles/critical.css'
	fs.readFile( CSS_FILE, 'utf8', ( err,data ) => {
		if ( err ) {
			return console.log( err )
		}
		if ( data ) {
			app.locals.criticalCSS = data
		}

		next()
	} )

} )

app.get( '/', ( req, res ) => {
	res.render( 'index' )
} )

app.listen( PORT, () => {

	console.log( `Hello from http://localhost:${ PORT }` )

} )