app.js

function Server (host, port) {

    // Create WebSocketServer
    var wss = new WebSocketServer({host: host, port: port})

    wss.on('connection', this.onConnect(ws))
}

Server.prototype.onConnect = function (ws) {
    // Debug
    console.log(`Client connected: ${ws.address}`)

    // Received Message Handler
    ws.on('message', onMessage(message))
}

Server.prototype.onMessage = function (message) {
    console.log(`Received ${message}`)
}