This issue is driving me crazy.
I get a webpackJsonp is not defined only when I am running it on a android 4.4.4 device. It was working a month ago, but now I do not know how to make it work again. I have tried to roll back to older version of package.js (without any luck).
This is only a problem for android 4.4.4.
Here is the info from ionic:
@ionic/cli-utils : 1.9.2 ionic (Ionic CLI) : 3.9.2
Cordova CLI : 7.0.1
@ionic/app-scripts : 2.1.4 Cordova Platforms : android 6.2.3 ios 4.5.0 Ionic Framework : ionic-angular 3.6.1
ios-deploy : 1.9.2 Node : v7.10.0 npm : 4.2.0 OS : macOS Sierra Xcode : Xcode 8.3.3 Build version 8E3004b