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Hints are meant as additional information to present to the developer about an error. The first use-case here is for the suggestion to name refs with "-Ref" if we encounter a mutation that looks like it might be a ref. The original error printing used a second error detail which printed the source code twice, a hint with just extra text is less noisy.
babel-plugin-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.
This package contains the React Compiler Babel plugin use in projects that make use of Babel. You can find instructions for using this plugin here: https://react.dev/learn/react-compiler