Individual skill
xstate-pro
Model state with XState state machines: actors, guards, actions, hierarchical and parallel states. Use for complex UI flows, workflows, and anywhere boolean flags multiply.
skills/xstate-pro/SKILL.md
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# XState Pro
A practical guide to XState (v5): modeling application logic as **state machines and statecharts** — explicit states, events, transitions, guards, and actions — plus the actor model for communicating machines. For anywhere boolean flags (`isLoading`, `isError`, `isOpen`...) multiply into impossible combinations.
## Overview
Most UI bugs are **impossible states**: `isLoading && isError`, a form that's both submitting and editable, a player that's playing and paused. State machines eliminate them by construction: the machine is in exactly one state, and only declared transitions move it. XState adds hierarchy (nested states), parallelism (orthogonal regions), guards (conditional transitions), and actions (side effects) — the full statechart formalism — with TypeScript inference over states and events.
## When to use
- Multi-step flows: wizards, checkout, onboarding, auth (idle → loading → success/error).
- Complex components: data fetching with retry, media players, editors with modes.
- Workflows and sagas: order processing, background jobs with states.
- Replacing sprawling `useReducer` or flag-soup `useState`.