An error appears when compiling a project. 
Compile file code:
'use strict' import def from "./src/classes/server"; def.start(); Included file code:
'use strict' import express from "express"; export default class Server { static start(port) { const app = express(); app.get('/', (req, res) => { res.sendfile(__dirname + "/src/index.html"); }); app.listen(port); } } 