Design Pattern: 'State Machines' with XState in Vue Architecture

Finite State Machines (FSMs) provide a formal architectural structure for complex component states, preventing 'impossible states' like 'Loading' and 'Success' appearing at once.

For complex flows (like a multi-step checkout or a video player), boolean flags like isLoading, isError, and isFinished become unmanageable. XState allows you to define 'States' and 'Transitions' (e.g., you can only go to 'Success' from 'Pending'). By integrating XState with Vue's reactivity, the UI becomes a pure reflection of the state machine, making bugs virtually impossible in transitions.