react-dev

Name: react-dev - Agent Skill
Rating: 3.2 (109 reviews)
Author: softaworks

109

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).

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CLI Install

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Method 1 - skills CLI

npx skills i softaworks/agent-toolkit/skills/react-dev

Method 2 - openskills (supports sync & update)

npx openskills install softaworks/agent-toolkit

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Installation Path

Download and extract to one of the following locations:

~/.claude/skills/react-dev/

SKILL.md

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Claude Sonnet 4.5

$0.20/task

Best for coding tasks

Environment setup included

React TypeScript

Type-safe React = compile-time guarantees = confident refactoring.

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

React 19 breaking changes require migration. Key patterns:

ref as prop - forwardRef deprecated:

// 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:

import { useActionState } from 'react';
 
type FormState = { errors?: string[]; success?: boolean };
 
function Form() {
  const [state, formAction, isPending] = useActionState(submitAction, {});
  return <form action

use() - unwraps promises/context:

function UserProfile({ userPromise }: { userPromise: Promise<User> }) {
  const user = use(userPromise); // Suspends until resolved
  return <div>{user.name}</div>;
}

See react-19-patterns.md for useOptimistic, useTransition, migration checklist.

Props - extend native elements:

type ButtonProps = {
  variant: 'primary' | 'secondary';
} & React.ComponentPropsWithoutRef<'button'>;
 
function Button({ variant, children, ...props }: ButtonProps) {
  return <button

Use specific event types for accurate target typing:

// Mouse
function handleClick(e: React.MouseEvent<HTMLButtonElement>) {
  e.currentTarget.disabled = true;
}
 
// Form
function handleSubmit(e: React.FormEvent<HTMLFormElement>) {

useState - explicit for unions/null:

const [user, setUser] = useState<User | null>(null);
const [status, setStatus] = useState<'idle' | 'loading'>('idle');

useRef - null for DOM, value for mutable:

Generic components infer types from props - no manual annotations at call site.

Pattern - keyof T for column keys, render props for custom rendering:

type Column<T> = {
  key: keyof T;
  header: string;
  render?: (value: T[keyof T

React 19 Server Components run on server, can be async.

Async data fetching:

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:

Both TanStack Router and React Router v7 provide type-safe routing solutions.

TanStack Router - Compile-time type safety with Zod validation:

import { createRoute } from '@tanstack/react-router';
import { z } from 'zod';
 
const userRoute = createRoute({
  path: '/users/$userId',
  component: UserPage,
  loader: async ({ params })

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()

hooks.md - useState, useRef, useReducer, useContext, custom hooks
event-handlers.md - all event types, generic handlers
react-19-patterns.md - useActionState, use(), useOptimistic, migration
generic-components.md - Table, Select, List, Modal patterns
server-components.md - async components, Server Actions, streaming
tanstack-router.md - TanStack Router typed routes, search params, navigation
react-router.md - React Router v7 loaders, actions, type generation, forms

Children typing:

type Props = {
  children: React.ReactNode;          // Anything renderable
  icon: React.ReactElement;           // Single element
  render: (data: T) => React.ReactNode;  // Render prop
};

Discriminated unions for variant props:

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>;
}

const formData = new FormData(e.currentTarget);

function handleChange(e: React.ChangeEvent<HTMLInputElement>) {

console.log(e.target.value);

function handleKeyDown(e: React.KeyboardEvent<HTMLInputElement>) {

if (e.key === 'Enter') e.currentTarget.blur();

See event-handlers.md for focus, drag, clipboard, touch, wheel events.

const inputRef = useRef<HTMLInputElement>(null); // DOM - use ?.

const countRef = useRef<number>(0); // Mutable - direct access

useReducer - discriminated unions for actions:

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:

function useToggle(initial = false) {
  const [value, setValue] = useState(initial);
  const toggle = () => setValue(v => !v);
  return [value, toggle] as const;
}

useContext - null guard pattern:

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 for useCallback, useMemo, useImperativeHandle, useSyncExternalStore.

type TableProps<T> = {

columns: Column<T>[];

keyExtractor: (item: T) => string | number;

function Table<T>({ data, columns, keyExtractor }: TableProps<T>) {

<tr>{columns.map(col => <th key={String(col.key)}>{col.header}</th>)}</tr>

{columns.map(col => (

{col.render ? col.render(item[col.key], item) : String(item[col.key])}

Constrained generics for required properties:

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 for Select, List, Modal, FormField patterns.

'use server';
 
export async function updateUser(userId: string, formData: FormData) {
  await db.user.update({ where: { id: userId }, data: { ... } });
  revalidatePath(`/users/${userId}`);
}

Client + Server Action:

'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:

// 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 for parallel fetching, streaming, error boundaries.

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:

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 for TanStack patterns and react-router.md for React Router patterns.