`tns prepare ios --watch` does not "watch" the project/node_modules for changes

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.0.2
• Cross-platform modules:
• Android Runtime:
• iOS Runtime:
• Plugin(s):

Describe the bug
Executing tns prepare ios --watch on a project compatible with 6.0.0, the project is correctly prepared but it is not being watched and making any changes to the app or node_modules folders does not trigger new prepare.

To Reproduce

• Make a new app using CLI
• Run `tns prepare ios --watch
• Wait for the project to prepare
• Make changes to the app folder or any nativescript plugin in node_modules
• The app is not re-prepared

Expected behavior
Using --watch watches the app and node_modules for changes

Empieza ejecutando tns prepare ios --watch en una aplicación nueva compatible con CLI y observa si los cambios dentro de los directorios app y node_modules activan otra preparación. Sigue el punto de entrada de watch de prepare ios y la configuración de su vigilancia de archivos; se considera terminado cuando ambas ubicaciones activan de forma fiable una nueva preparación.