Prevent reimport of CoreModule STYLE 04-11
will be null if CoreModule is not reimported by another module,
otherwise it will throw an error.
The root AppModule imports the CoreModule and adds the providers to the AppModule
providers. Recommended in the
Angular 2 docs - CoreModule.forRoot
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CoreModule exists to make commonly used singleton services and single-use classes available for use in the many other modules.
AppModule
This module follows the Angular style guide STYLE 04-11