关于 react-19
面向开发者的 React 19 技能指南,说明组件、导入和数据处理规范,涵盖 Server Components、Actions、use() Hook 及将 ref 作为属性传递。
主要功能
- 01React Compiler 记忆化规范
- 02命名导入规范
- 03优先使用 Server Components
- 04使用 use() 读取 Promise
- 05Actions 与 useActionState
- 06将 ref 作为属性
适用场景
- 01判断何时使用客户端组件
- 02在组件中读取 Promise
- 03使用 Actions 处理表单提交
- 04向函数组件传递 ref
安装
复制下面的命令,在终端中运行。
$
npx skills add https:/ / github.com/ prowler-cloud/ prowler --skill react-19安装后在 Claude Code 中输入/react-19确认已加载。
详细介绍
不进行手动记忆化(必需)
// ✅ React Compiler handles optimization automatically
function Component({ items }) {
const filtered = items.filter(x => x.active);
const sorted = filtered.sort((a, b) => a.name.localeCompare(b.name));
const handleClick = (id) => {
console.log(id);
};
return <List items={sorted} onClick={handleClick} />;
}
// ❌ NEVER: Manual memoization
const filtered = useMemo(() => items.filter(x => x.active), [items]);
const handleClick = useCallback((id) => console.log(id), []);
导入(必需)
// ✅ ALWAYS: Named imports
import { useState, useEffect, useRef } from "react";
// ❌ NEVER
import React from "react";
import * as React from "react";
优先使用服务端组件
// ✅ Server Component (default) - no directive
export default async function Page() {
const data = await fetchData();
return <ClientComponent data={data} />;
}
// ✅ Client Component - only when needed
"use client";
export function Interactive() {
const [state, setState] = useState(false);
return <button onClick={() => setState(!state)}>Toggle</button>;
}
何时使用 "use client"
- useState、useEffect、useRef、useContext
- 事件处理程序(onClick、onChange)
- 浏览器 API(window、localStorage)
use() Hook
import { use } from "react";
// Read promises (suspends until resolved)
function Comments({ promise }) {
const comments = use(promise);
return comments.map(c => <div key={c.id}>{c.text}</div>);
}
// Conditional context (not possible with useContext!)
function Theme({ showTheme }) {
if (showTheme) {
const theme = use(ThemeContext);
return <div style={{ color: theme.primary }}>Themed</div>;
}
return <div>Plain</div>;
}
Action 与 useActionState
"use server";
async function submitForm(formData: FormData) {
await saveToDatabase(formData);
revalidatePath("/");
}
// With pending state
import { useActionState } from "react";
function Form() {
const [state, action, isPending] = useActionState(submitForm, null);
return (
<form action={action}>
<button disabled={isPending}>
{isPending ? "Saving..." : "Save"}
</button>
</form>
);
}
将 ref 用作属性(无需 forwardRef)
// ✅ React 19: ref is just a prop
function Input({ ref, ...props }) {
return <input ref={ref} {...props} />;
}
// ❌ Old way (unnecessary now)
const Input = forwardRef((props, ref) => <input ref={ref} {...props} />);
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