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| [React Compiler](/learn/react-compiler) is a build-time tool that optimizes your React app through automatic memoization. | ||
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| This stable release is our first of many. The compiler will continue to evolve and improve, and we expect to see it become a new foundation and era for the next decade and more of React. | ||
| You can get an intuitive sense of how the Compiler works by [looking at the playground](https://playground.react.dev/#N4Igzg9grgTgxgUxALhAMygOzgFwJYSYAEAKhACYQAyeYOAFMEThRGADRFp4A2OCMIgF8AlEWAAdYkTiE6XXvxgJyZSmCIBeZqzAA6bnwH0cWgHzM9dAIY4oGzY4VGYIgNxSiRT1yy4CxAAW1pjkPAgAwjx4cADW9HjkYpLSXrKYkOF6PBAA5glJPkLexD7KdjDEADw08nj8ALZgmsCGSipqbMWEUTGxLcGh4b1xxQD0Zh6YQiDsIOncuSggeA0ADhAwpjgAnmsI4kQACjxQuXiYAPJr+HLCXDAQDUQA5ABG1m8IPAC0a6fnTA-ZTWXA-WTrXgCMbkWg4F5TKSMHxjMYQta8WwBACyFAQyG8IGsPB4EhAUmKYCxYG4CA0JzOF2utwy7lm4ECEAA7gBJTBKTDEsAoHAwKAIIRAA). Fundamentally, React Compiler relies on an old idea from functional programming: pure functions don't "do" anything (they only compute things), so it is safe to reorder their calls, or to reuse their past output for the same inputs. React Compiler checks that your code follows the [Rules of React](https://react.dev/reference/rules) which ensure your code can be reordered this way. |
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The one thing that nags me about this explanation is that most functions in React cannot be treated as pure. We treat components and hooks as pure, but everything else in the component is a giant blob of mutability. What makes the compiler work is precisely modeling data and control flow, inferring types, and tracking mutability and aliasing in order to limit the impact of mutability.
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gaearon
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