Question:

Hi, Waiting for connectivity with ionic-app-scripts continues with ionic serve–lab?

[app-scripts] [18:17:21]  tslint: ...orkSpace_Ionic3_MobileApp/prototype/src/pages/profile-details/profile-details.ts, line: 2
[INFO] Waiting for connectivity with ionic-app-scripts...
[INFO] Waiting for connectivity with ionic-app-scripts...
[INFO] Waiting for connectivity with ionic-app-scripts...

Ionic Info :

Ionic:

   ionic (Ionic CLI)  : 4.0.3 (C:\Users\user\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.1.11

Cordova:

   cordova (Cordova CLI) : 8.0.0
   Cordova Platforms     : browser 5.0.3

System:

   Android SDK Tools : 26.1.1
   NodeJS            : v9.1.0 (C:\Program Files\nodejs\node.exe)
   npm               : 5.5.1
   OS                : Windows 10

Environment:

   ANDROID_HOME : C:\Users\user2\AppData\Local\Android\Sdk

Below I have updated mine package.json file. package.json

{
      "name": "name",
      "version": "0.0.1",
      "author": "Ionic Framework",
      "homepage": "http://ionicframework.com/",
      "private": true,
      "scripts": {
        "clean": "ionic-app-scripts clean",
        "build": "ionic-app-scripts build --aot --minifyjs --minifycss --release",
        "lint": "ionic-app-scripts lint",
        "ionic:build": "ionic-app-scripts build",
        "ionic:serve": "ionic-app-scripts serve"
      },

Solution:

Try npm run start instead of ionic serve. This will work.