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`@enablePreserveExistingMemoizationGuarantees` mode currently does not guarantee memoization of primitive-returning functions. We're often able to infer that a function returns a primitive based on how its result is used, for example `foo() + 1` or `object[getIndex()]`, and by default we do not currently memoize computation that produces a primitive. The reasoning behind this is that the compiler is primarily focused on stopping cascading updates — it's fine to recompute a primitive since we can cheaply compare that primitive and avoid unnecessary downstream recomputation. But we've gotten a lot of feedback that people find this surprising, and that sometimes the computation can be expensive enough that it should be memoized. This PR changes `@enablePreserveExistingMemoizationGuarantees` mode to ensure that primitive-returning functions get memoized. Other modes will not memoize these functions. Separately from this we are considering enabling this mode by default. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/34343). * #34347 * #34346 * __->__ #34343 * #34335 |
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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