React Compiler：介绍、优点、缺点及何时使用
React Compiler is Meta's latest attempt to improve React performance. It's a build-time optimization tool for React apps that automatically memoizes (caches) parts of your code.
React Compiler 是 Meta 最新的尝试，用于 改善 React 性能。它是一个构建时优化工具，用于 React 应用，会自动 memoize（缓存）您的代码部分。
The promise is you can forget about manual memoization by installing React Compiler, which handles it all during the build process ✨. This, ideally, means your code becomes cleaner and more readable, unnecessary re-renders are eliminated, and Interaction to Next Paint (INP) improves.
承诺是，通过安装 React Compiler，你可以忘记手动 memoization，它会在构建过程中处理一切 ✨。理想情况下，这意味着你的代码变得更干净、更易读，不必要的重新渲染被消除，并且 Interaction to Next Paint (INP) 得到改善。
React Compiler, previously known as React Forget, became stable in October 2025 after years of development. In this post, we'll look into what it looks like in practice.
React Compiler，先前称为 React Forget，在多年的开发后，于 2025 年 10 月稳定发布。本文将探讨它在实际中的表现。
What Is React Compiler?
什么是 React Compiler？
By default, React re-renders components whenever their state changes or their parent re-renders. These re-renders cascade down the component tree (i.e., when a parent re-renders, all their children re-render by default, even if their own props haven't changed).
默认情况下，React 会在组件状态变化或父组件重新渲染时重新渲染组件。这些重新渲染会级联到组件树中 （即，当父组件重新渲染时，所有子组件默认都会重新渲染，即使它们自己的 props 没有变化）。
With proper memoization, you can prevent unnecessary re-renders. Memoization caches the result of a computation or component render so it can be reused when its inputs haven't changed. With manual memoization, you can prevent unnecessary re-renders by memoizing:
通过适当的 memoization，您可以防止不必要的重新渲染。Memoization 会缓存计算或组件渲染的结果，以便在输入未更改时重用。通过手动 memoization，您可以通过 memoizing 来防止不必要的重新渲染：
However, manual memoization clutters code, requires constant maintenance, and is prone to errors. This is where React Compiler comes into the picture by analyzing your code at build time and automatically adding memoization to eligible code.
然而，手动记忆化会使代码杂乱，需要持续维护，并且容易出错。这就是 React Compiler 的用武之地，它在构建时分析您的代码，并自动为符合条件的代码添加记忆化。