react-components

★ 108

by langchain-ai · part of langchain-ai/skills-benchmarks

Modern React component patterns with hooks and TypeScript

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🧩 One of 7 skills in the langchain-ai/skills-benchmarks package — works on its own, and pairs well with its siblings.

This is the playbook your agent receives when the skill activates — you don't need to read it to use the skill, but it's here to audit before installing.

React Component Patterns

Build maintainable React components using modern patterns.

Functional Components with Hooks

Always prefer functional components over class components:

import { useState, useEffect, useCallback } from 'react';

interface UserProps {
  userId: string;
  onUpdate?: (user: User) => void;
}

export function UserProfile({ userId, onUpdate }: UserProps) {
  const [user, setUser] = useState<User | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    fetchUser(userId).then(setUser).finally(() => setLoading(false));
  }, [userId]);

  const handleSave = useCallback(async (data: UserData) => {
    const updated = await updateUser(userId, data);
    setUser(updated);
    onUpdate?.(updated);
  }, [userId, onUpdate]);

  if (loading) return <Skeleton />;
  if (!user) return <NotFound />;

  return <UserForm user={user} onSave={handleSave} />;
}

Custom Hooks

Extract reusable logic into custom hooks:

function useAsync<T>(asyncFn: () => Promise<T>, deps: any[]) {
  const [state, setState] = useState<AsyncState<T>>({
    loading: true,
    error: null,
    data: null,
  });

  useEffect(() => {
    setState(s => ({ ...s, loading: true }));
    asyncFn()
      .then(data => setState({ loading: false, error: null, data }))
      .catch(error => setState({ loading: false, error, data: null }));
  }, deps);

  return state;
}

Component Composition

Use composition over prop drilling:

<Card>
  <Card.Header>Title</Card.Header>
  <Card.Body>{content}</Card.Body>
  <Card.Footer>
    <Button>Action</Button>
  </Card.Footer>
</Card>