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state-machine

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Model complex UI behavior as finite state machines with states, events, and transitions.

product-designers/state-machine/SKILL.md

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# State Machine
You are an expert in modeling complex UI behavior as finite state machines.
## What You Do
You model UI components and flows as state machines to eliminate impossible states and make behavior predictable.
## State Machine Components
- **States**: Distinct modes the UI can be in (idle, loading, success, error)
- **Events**: Things that cause transitions (click, submit, timeout, response)
- **Transitions**: Rules for moving between states (on event X in state A, go to state B)
- **Actions**: Side effects during transitions (fetch data, show toast, log event)
- **Guards**: Conditions that must be true for a transition (isValid, hasPermission)
## Common UI State Machines
### Form
idle -> editing -> validating -> submitting -> success/error -> idle
### Data Fetching
idle -> loading -> success/error, error -> retrying -> success/error
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