Mobile App Development with Ionic 2, 1st Edition

Chapter 10. Debugging and Testing Your Ionic Application

There will come a time when you need to debug your Ionic application. In this chapter, we will look at various solutions and tools you can use to help you resolve possible issues that may arise. Since Ionic is built atop a collection of technologies, this means that debugging your application may not always be straightforward. This can be a challenge for some developers who are used to having a complete ecosystem to work within. Let’s learn how to use some of the debugging tools.

Debugging your Ionic application can be broken down into three distinct phases: browser level, emulator debugging, and on-device debugging. Each one of the phases offers different levels of insight into your application. Since Ionic is built atop web technologies, often the best place to start debugging is with our browser. But even before turning to those solutions, there are some other first steps we can take.

With Ionic 2 being developed in TypeScript, this is actually our first line of defense in writing a working application. If your IDE is complaining about a variable or a function, that is usually a good sign that something is amiss. There are times when a reference is incorrectly updated when refactoring or a path to a module is off by a sub folder. Spotting these simple mistakes can save a lot of questioning on why your application is having issues.

Now, your IDE won’t be perfect in spotting everything while you are editing your code. The ...