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Adds a new `enableUseKeyedState` compiler flag that changes the error message for unconditional setState calls during render. When `enableUseKeyedState` is enabled, the error recommends using `useKeyedState(initialState, key)` to reset state when dependencies change. When disabled (the default), it links to the React docs for the manual pattern of storing previous values in state. Both error messages now include helpful bullet points explaining the two main alternatives: 1. Use useKeyedState (or manual pattern) to reset state when other state/props change 2. Compute derived data directly during render without using state
React Compiler
React Compiler is a compiler that optimizes React applications, ensuring that only the minimal parts of components and hooks will re-render when state changes. The compiler also validates that components and hooks follow the Rules of React.
More information about the design and architecture of the compiler are covered in the Design Goals.
More information about developing the compiler itself is covered in the Development Guide.