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Tagged with internals

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React Hard Theory

React internals: Fiber, concurrent rendering, StrictMode, and why effects run twice in development

Fiber is React's internal architecture for scheduling and prioritizing work, and StrictMode helps surface unsafe patterns in development.

  • Fiber enables more flexible rendering work
  • Concurrent rendering changes scheduling, not your component API directly
  • StrictMode may intentionally double-invoke some logic in dev

React internals: Fiber, concurrent rendering, StrictMode, and why effects run twice in development