Dva is a state management library and client-side application framework designed for building user interfaces with React and Redux. It functions as an asynchronous logic orchestrator and a single page application router, organizing application data through a structured data flow of reducers, effects, and subscriptions.
The framework distinguishes itself through the use of generator functions to manage asynchronous workflows and sequential side effects, keeping these operations separate from synchronous state updates. It implements namespace-based model organization to group business logic and supports dynamic model injection to load data models and routing logic on demand.
The system covers a broad range of capabilities, including the synchronization of browser URL history with global state, the binding of external data streams such as WebSockets to action dispatchers, and the integration of core plugins for cross-cutting concerns. It also provides tools for hot model replacement during development and centralized error management for asynchronous effects.