Problem Statement
What is MobX and how does it handle state management?
Explanation
MobX uses transparent reactive programming where state is made observable with @observable annotations, actions modify state with @action annotations, and computed values derive from observables with @computed. MobX automatically tracks dependencies when observables are accessed in reactions or computed values, updating only affected parts when observables change without manual dependency management.
Flutter_mobx package provides Observer widget that automatically rebuilds when any observable it accesses changes. MobX tracks which observables the widget reads during build, creating dependencies automatically. This eliminates manual subscription management - just wrap widget in Observer and read observables, MobX handles the rest. This transparency makes code clean but can be magical to newcomers.
MobX requires code generation with mobx_codegen to generate boilerplate from annotations. Actions ensure state changes are atomic and observable updates are batched for performance. Reactions like autorun or when execute code in response to observable changes. MobX is powerful for developers preferring reactive programming with minimal boilerplate, though the code generation and annotations make it less idiomatic to Flutter than Provider.