SKILL.md
$27
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} />);