Key principles include: Modularity (feature modules), Component-based architecture, Dependency Injection, Separation of Concerns, Single Responsibility. Focus on maintainability, scalability, and reusability. Consider proper layer separation.
Core Module contains singleton services, one-time imported components. Houses app-wide services, guards, interceptors. Should be imported only in AppModule. Ensures single instance of services.
State management through services (small apps) or NgRx/other state libraries (large apps). Consider data flow, state access patterns. Implement proper immutability, change detection strategies.
Service architecture: proper separation, single responsibility, injectable services. Consider service scope, dependency injection. Implement proper error handling, logging.
API integration: service layer abstraction, typed interfaces, proper error handling. Implement caching, retry strategies. Consider API versioning, security.
Smart components handle business logic, data. Presentational components focus on UI, receive data via inputs. Promotes reusability, separation of concerns. Consider component responsibility division.
Communication patterns: Input/Output, Services, State Management, Event Bus. Choose based on component relationship, data flow needs. Consider component coupling, maintainability.
Micro-frontends through Module Federation, Custom Elements. Handle inter-app communication, shared dependencies. Consider deployment strategy, team organization.
Feature modules organize related components, services, pipes. Support lazy loading, encapsulation. Improve maintainability, testing. Consider domain boundaries, functionality grouping.
DDD through feature modules, domain services, entities. Organize by business domains. Consider bounded contexts, domain logic separation. Important for complex business applications.
Form patterns: Template-driven vs Reactive forms, form builders, validation services. Consider form complexity, validation requirements. Implement proper error handling, user feedback.
Testing architecture: unit tests, integration tests, e2e tests. Implement proper test organization, coverage. Consider test pyramid, testing strategies.
i18n architecture: translation files, language services, locale handling. Implement proper text extraction, runtime translation. Consider cultural differences, formatting.
