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Previously we would insert new (Arrow)FunctionExpressions as a sibling of the original function. However this would break in the outlining case as it would cause the original function expression's parent to become a SequenceExpression, breaking a bunch of assumptions in the babel plugin. To get around this, we synthesize a new VariableDeclaration to contain the newly inserted function expression and therefore insert it as a true sibling to the original function. Yeah, it's kinda gross ghstack-source-id: df13e3b439962b95af4bbd82ef4302624668faf7 Pull Request resolved: https://github.com/facebook/react/pull/30446
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