What classes should not be added to declarations?

The below class types shouldn't be added to declarations

  1. A class which is already declared in any another module.
  2. Directives imported from another module.
  3. Module classes.
  4. Service classes.
  5. Non-Angular classes and objects, such as strings, numbers, functions, entity models, configurations, business logic, and helper classes.

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Made by Michael Sakhniuk

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