Hi Christophe, A word of advice, try to steer away from inheritance. If you read the book from the gang of 4(1995), it will teach you to favour composition over inheritance. the problem with inheritance is that it creates hard to maintain/diagnose apps. Not only in TS but in all languages it's used. Move your business logic into services, and inject those services in all components that need the same logic. Your contact related code should be in a constactService, that you then inject where you need it.
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