A walkthrough of building a scalable, decoupled routing system for Flutter apps using go_router as the foundation. The system introduces a unified AppRouteInfo protocol for type-safe route definitions, modular AppModuleRouter per feature, composition APIs for cross-module navigation without tight coupling, typed route arguments for path/query params, flexible presentation modes (bottom sheet, dialog, full-screen), provider wrapping via AppRouteWrapper, navigation observers, and authentication guards. Code examples cover initialization with dependency injection, module router setup, shell routes, and guard configuration.
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