PrimeNG on NG4: Unexpected module 'DropdownModule' declared by the module 'AppModule'. Please add a @Pipe/@Directive/@Component annotation. · Issue #3144 · primefaces/primeng · GitHub
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angular - error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class. Is it missing an @NgModule annotation? - Stack Overflow
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karma jasmine - How to unit test an Angular component which uses CarouselModule - Stack Overflow
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Please add a @Pipe/@Directive/@Component annotation in Angular 4 · Issue #15890 · angular/angular · GitHub