react-19
React 19 patterns with React Compiler. Trigger: When writing React components - no useMemo/useCallback needed.
- Installs
- 267
- Last 24h
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- Trending rank
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- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/gentleman-programming/gentleman-skills --skill react-19- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads react-19 automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
No Manual Memoization (REQUIRED)
// ✅ 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), []);
Imports (REQUIRED)
// ✅ ALWAYS: Named imports
import { useState, useEffect, useRef } from "react";
// ❌ NEVER
import React from "react";
import * as React from "react";
Server Components First
// ✅ 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>;
}
When to use "use client"
- useState, useEffect, useRef, useContext
- Event handlers (onClick, onChange)
- Browser APIs (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>;
}
Actions & 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>
);
}
ref as Prop (No 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} />);
Keywords
react, react 19, compiler, useMemo, useCallback, server components, use hook
FAQ
What does the react-19 skill do?
React 19 patterns with React Compiler. Trigger: When writing React components - no useMemo/useCallback needed.
How do I install react-19?
Run npx skills add https://github.com/gentleman-programming/gentleman-skills --skill react-19 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/react-19/ (personal) or .claude/skills/react-19/ (project).
Which AI agents can use react-19?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is react-19 safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains react-19?
It is published by gentleman-programming in gentleman-programming/gentleman-skills. It has 267 recorded installs.
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