NativeScript has a number of capabilities to make debugging easy. Our LiveSync feature constantly pushes code updates to the native emulators or devices to ensure the fastest time to see the impact of changes. We provide a free NativeScript Visual Studio Code plugin complete with variable introspection, break points (even conditionals) and other common debugging tasks. Take a look at this NativeScript debugging video for a quick look at what you get. We incorporated Google Chrome developer tools in NativeScript 2.5 and will continue to expand on the feature set with each release.
More information about NativeScript debugging can be found in the debugging section of the NativeScript documentation.