#complex-logic

Model complex logic with XState. Machine structure: 1. States and transitions. 2. Context for extended state. 3. Actions on entry/exit. 4. Guards for conditional transitions. 5. Services for async invocations. 6. Parallel states. 7. History states. 8. Visualize with @xstate/inspect. Use for multi-step forms, auth flows, or game logic. Prevents impossible states through explicit modeling.