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Dev.to
6/26/2026
Stop Impossible States: State Machines in React ⚡

Stop Impossible States: State Machines in React ⚡

Short summary

Multiple React useState booleans create 'Boolean Soup'—impossible state combinations like both isLoading and isError true, causing UI glitches. Finite State Machines enforce one-state-at-a-time transitions, eliminating this bug class entirely. XState is the enterprise React standard for implementing FSMs, making complex interfaces predictable, testable, and self-documenting.

  • Multiple useState booleans create mathematically impossible states (2^n combinations) in React components
  • Finite State Machines enforce strict one-state-at-a-time rule, eliminating Boolean Soup bugs
  • XState library provides enterprise-standard React implementation with concrete code examples and clear transition rules

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