Answer
CoreModule contains global singletons (services, interceptors, configs). Loading it more than once creates duplicate instances and breaks global state.
Quick Answer
CoreModule holds app-wide singleton services (AuthService, LoggingService, HTTP interceptors) and is imported only once in AppModule. Importing it in feature modules would create duplicate service instances. Guard against multiple imports: add a constructor check that throws if the module was already loaded. Angular's providedIn: "root" mostly replaces CoreModule for services in modern Angular.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ