Model a finite state machine in types so only valid state-to-state transitions compile, events are scoped to states, and impossible transitions are caught at build time.
## CONTEXT A finite state machine encoded in types makes invalid transitions impossible: from a given state, only the allowed events compile, and each event maps to a permitted next state. In 2026 this pattern underpins typed XState-style machines, wizard flows, and connection lifecycles. The user wants a state…
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