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Conditionally calling setState in an effect is sometimes necessary, but should generally follow the pattern of using a "previous vaue" ref to manually compare and ensure that the setState is idempotent. See fixture for an example.
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.