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Reorganize: Move all skills to skills/ folder

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- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

Co-Authored-By: Claude <noreply@anthropic.com>
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admin
2026-01-23 18:05:17 +00:00
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react-dev/skill.md
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---
name: react-dev
version: 1.0.0
description: This skill should be used when building React components with TypeScript, typing hooks, handling events, or when React TypeScript, React 19, Server Components are mentioned. Covers type-safe patterns for React 18-19 including generic components, proper event typing, and routing integration (TanStack Router, React Router).
---
# React TypeScript
Type-safe React = compile-time guarantees = confident refactoring.
<when_to_use>
- Building typed React components
- Implementing generic components
- Typing event handlers, forms, refs
- Using React 19 features (Actions, Server Components, use())
- Router integration (TanStack Router, React Router)
- Custom hooks with proper typing
NOT for: non-React TypeScript, vanilla JS React
</when_to_use>
<react_19_changes>
React 19 breaking changes require migration. Key patterns:
**ref as prop** - forwardRef deprecated:
```typescript
// React 19 - ref as regular prop
type ButtonProps = {
ref?: React.Ref<HTMLButtonElement>;
} & React.ComponentPropsWithoutRef<'button'>;
function Button({ ref, children, ...props }: ButtonProps) {
return <button ref={ref} {...props}>{children}</button>;
}
```
**useActionState** - replaces useFormState:
```typescript
import { useActionState } from 'react';
type FormState = { errors?: string[]; success?: boolean };
function Form() {
const [state, formAction, isPending] = useActionState(submitAction, {});
return <form action={formAction}>...</form>;
}
```
**use()** - unwraps promises/context:
```typescript
function UserProfile({ userPromise }: { userPromise: Promise<User> }) {
const user = use(userPromise); // Suspends until resolved
return <div>{user.name}</div>;
}
```
See [react-19-patterns.md](references/react-19-patterns.md) for useOptimistic, useTransition, migration checklist.
</react_19_changes>
<component_patterns>
**Props** - extend native elements:
```typescript
type ButtonProps = {
variant: 'primary' | 'secondary';
} & React.ComponentPropsWithoutRef<'button'>;
function Button({ variant, children, ...props }: ButtonProps) {
return <button className={variant} {...props}>{children}</button>;
}
```
**Children typing**:
```typescript
type Props = {
children: React.ReactNode; // Anything renderable
icon: React.ReactElement; // Single element
render: (data: T) => React.ReactNode; // Render prop
};
```
**Discriminated unions** for variant props:
```typescript
type ButtonProps =
| { variant: 'link'; href: string }
| { variant: 'button'; onClick: () => void };
function Button(props: ButtonProps) {
if (props.variant === 'link') {
return <a href={props.href}>Link</a>;
}
return <button onClick={props.onClick}>Button</button>;
}
```
</component_patterns>
<event_handlers>
Use specific event types for accurate target typing:
```typescript
// Mouse
function handleClick(e: React.MouseEvent<HTMLButtonElement>) {
e.currentTarget.disabled = true;
}
// Form
function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
e.preventDefault();
const formData = new FormData(e.currentTarget);
}
// Input
function handleChange(e: React.ChangeEvent<HTMLInputElement>) {
console.log(e.target.value);
}
// Keyboard
function handleKeyDown(e: React.KeyboardEvent<HTMLInputElement>) {
if (e.key === 'Enter') e.currentTarget.blur();
}
```
See [event-handlers.md](references/event-handlers.md) for focus, drag, clipboard, touch, wheel events.
</event_handlers>
<hooks_typing>
**useState** - explicit for unions/null:
```typescript
const [user, setUser] = useState<User | null>(null);
const [status, setStatus] = useState<'idle' | 'loading'>('idle');
```
**useRef** - null for DOM, value for mutable:
```typescript
const inputRef = useRef<HTMLInputElement>(null); // DOM - use ?.
const countRef = useRef<number>(0); // Mutable - direct access
```
**useReducer** - discriminated unions for actions:
```typescript
type Action =
| { type: 'increment' }
| { type: 'set'; payload: number };
function reducer(state: State, action: Action): State {
switch (action.type) {
case 'set': return { ...state, count: action.payload };
default: return state;
}
}
```
**Custom hooks** - tuple returns with as const:
```typescript
function useToggle(initial = false) {
const [value, setValue] = useState(initial);
const toggle = () => setValue(v => !v);
return [value, toggle] as const;
}
```
**useContext** - null guard pattern:
```typescript
const UserContext = createContext<User | null>(null);
function useUser() {
const user = useContext(UserContext);
if (!user) throw new Error('useUser outside UserProvider');
return user;
}
```
See [hooks.md](references/hooks.md) for useCallback, useMemo, useImperativeHandle, useSyncExternalStore.
</hooks_typing>
<generic_components>
Generic components infer types from props - no manual annotations at call site.
**Pattern** - keyof T for column keys, render props for custom rendering:
```typescript
type Column<T> = {
key: keyof T;
header: string;
render?: (value: T[keyof T], item: T) => React.ReactNode;
};
type TableProps<T> = {
data: T[];
columns: Column<T>[];
keyExtractor: (item: T) => string | number;
};
function Table<T>({ data, columns, keyExtractor }: TableProps<T>) {
return (
<table>
<thead>
<tr>{columns.map(col => <th key={String(col.key)}>{col.header}</th>)}</tr>
</thead>
<tbody>
{data.map(item => (
<tr key={keyExtractor(item)}>
{columns.map(col => (
<td key={String(col.key)}>
{col.render ? col.render(item[col.key], item) : String(item[col.key])}
</td>
))}
</tr>
))}
</tbody>
</table>
);
}
```
**Constrained generics** for required properties:
```typescript
type HasId = { id: string | number };
function List<T extends HasId>({ items }: { items: T[] }) {
return <ul>{items.map(item => <li key={item.id}>...</li>)}</ul>;
}
```
See [generic-components.md](examples/generic-components.md) for Select, List, Modal, FormField patterns.
</generic_components>
<server_components>
React 19 Server Components run on server, can be async.
**Async data fetching**:
```typescript
export default async function UserPage({ params }: { params: { id: string } }) {
const user = await fetchUser(params.id);
return <div>{user.name}</div>;
}
```
**Server Actions** - 'use server' for mutations:
```typescript
'use server';
export async function updateUser(userId: string, formData: FormData) {
await db.user.update({ where: { id: userId }, data: { ... } });
revalidatePath(`/users/${userId}`);
}
```
**Client + Server Action**:
```typescript
'use client';
import { useActionState } from 'react';
import { updateUser } from '@/actions/user';
function UserForm({ userId }: { userId: string }) {
const [state, formAction, isPending] = useActionState(
(prev, formData) => updateUser(userId, formData), {}
);
return <form action={formAction}>...</form>;
}
```
**use() for promise handoff**:
```typescript
// Server: pass promise without await
async function Page() {
const userPromise = fetchUser('123');
return <UserProfile userPromise={userPromise} />;
}
// Client: unwrap with use()
'use client';
function UserProfile({ userPromise }: { userPromise: Promise<User> }) {
const user = use(userPromise);
return <div>{user.name}</div>;
}
```
See [server-components.md](examples/server-components.md) for parallel fetching, streaming, error boundaries.
</server_components>
<routing>
Both TanStack Router and React Router v7 provide type-safe routing solutions.
**TanStack Router** - Compile-time type safety with Zod validation:
```typescript
import { createRoute } from '@tanstack/react-router';
import { z } from 'zod';
const userRoute = createRoute({
path: '/users/$userId',
component: UserPage,
loader: async ({ params }) => ({ user: await fetchUser(params.userId) }),
validateSearch: z.object({
tab: z.enum(['profile', 'settings']).optional(),
page: z.number().int().positive().default(1),
}),
});
function UserPage() {
const { user } = useLoaderData({ from: userRoute.id });
const { tab, page } = useSearch({ from: userRoute.id });
const { userId } = useParams({ from: userRoute.id });
}
```
**React Router v7** - Automatic type generation with Framework Mode:
```typescript
import type { Route } from "./+types/user";
export async function loader({ params }: Route.LoaderArgs) {
return { user: await fetchUser(params.userId) };
}
export default function UserPage({ loaderData }: Route.ComponentProps) {
const { user } = loaderData; // Typed from loader
return <h1>{user.name}</h1>;
}
```
See [tanstack-router.md](references/tanstack-router.md) for TanStack patterns and [react-router.md](references/react-router.md) for React Router patterns.
</routing>
<rules>
ALWAYS:
- Specific event types (MouseEvent, ChangeEvent, etc)
- Explicit useState for unions/null
- ComponentPropsWithoutRef for native element extension
- Discriminated unions for variant props
- as const for tuple returns
- ref as prop in React 19 (no forwardRef)
- useActionState for form actions
- Type-safe routing patterns (see routing section)
NEVER:
- any for event handlers
- JSX.Element for children (use ReactNode)
- forwardRef in React 19+
- useFormState (deprecated)
- Forget null handling for DOM refs
- Mix Server/Client components in same file
- Await promises when passing to use()
</rules>
<references>
- [hooks.md](references/hooks.md) - useState, useRef, useReducer, useContext, custom hooks
- [event-handlers.md](references/event-handlers.md) - all event types, generic handlers
- [react-19-patterns.md](references/react-19-patterns.md) - useActionState, use(), useOptimistic, migration
- [generic-components.md](examples/generic-components.md) - Table, Select, List, Modal patterns
- [server-components.md](examples/server-components.md) - async components, Server Actions, streaming
- [tanstack-router.md](references/tanstack-router.md) - TanStack Router typed routes, search params, navigation
- [react-router.md](references/react-router.md) - React Router v7 loaders, actions, type generation, forms
</references>