'use strict';

const express = require('express');
const app     = express();

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

const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;

const server = app.listen(DEFAULT_PORT, () => {
    const host = server.address().address;
    const port = server.address().port;

    console.info('App listening at https://${host}:${port}');
});

@@ -344,24 +344,29 @@
 s://
-$%7Bhost%7D:$%7B
+' + host + ':' + 
 port
-%7D'
 );%0A%7D

Fix syntax error