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Joe Savona
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In #34125 I added a hint where if you assign to the .current property of a frozen object, we suggest naming the variable as `ref` or `-Ref`. However, the tracking for mutations that assign to .current specifically wasn't propagated past function expression boundaries, which meant that the hint only showed up if you mutated the ref in the main body of the component/hook. That's less likely to happen since most folks know not to access refs in render. What's more likely is that you'll (correctly) assign a ref in an effect or callback, but the compiler will throw an error. By showing a hint in this case we can help people understand the naming pattern.
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.