ErrorType is used to distinguish between app error and unknown error.

NewAppError initializes a new domain error using an error and its type.

NewAppErrorWithType initializes a new default error for a given type.

InputEmpty error indicates empty input params.

NotFound error indicates a missing / not found record.

RepositoryError indicates a repository (e.g database) error.

ResourceAlreadyExists indicates a duplicate / already existing record.

UnknownError indicates an error that the app cannot find the cause for.

ValidationError indicates an error in input validation.

AppError defines an application (domain) error.