Wifi.connect() not executing its callback function

Here's another one closer to your version:

//ESP32wifi1.js
// 5 Feb2018

var ssid="sasas";
var key="password";

console.log('start');

var wifi = require('Wifi'); 

var onWiFiConnect=function(){
  var IPobject = wifi.getIP();
  var IP = IPobject.ip;
  var MAC = IPobject.mac;
  console.log("IP:");
  console.log(IP);
// if IP is 0.0.0.0 failed to connect have to reset to clear 
  console.log("MAC:");
  console.log(MAC);
};
 
wifi.connect(ssid, {password: key},onWiFiConnect()); 

And the output:

 1v95 Copyright 2017 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>start
IP:
192.168.1.14
MAC:
24:0a:c4:00:97:2a
=undefined
>