Create basic Express server

config.js

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+'use strict';
+
+module.exports = {
+  PORT: process.env.PORT || 8080
+};

index.js

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+'use strict';
+
+const express = require('express');
+
+const { PORT } = require('./config');
+
+const app = express();
+
+app.use(express.static('public'));
+
+function runServer(port = PORT) {
+  const server = app
+    .listen(port, () => {
+      // eslint-disable-next-line no-console
+      console.info(`App listening on port ${server.address().port}`);
+    })
+    .on('error', err => {
+      // eslint-disable-next-line no-console
+      console.error('Express failed to start');
+      // eslint-disable-next-line no-console
+      console.error(err);
+    });
+}
+
+if (require.main === module) {
+  runServer();
+}
+
+module.exports = app;