Frontend Dev

Frontend Dev

A comprehensive skill for React + TypeScript frontend development with modern tooling.

Tech Stack

Project Structure

src/
  components/           # Reusable UI components
    ui/                 # Base UI components (Button, Input, Card)
    features/           # Feature-specific components
  context/              # Context providers and hooks
  hooks/                # Custom React hooks
  pages/                # Page components
  types/                # TypeScript interfaces and types
  utils/                # Utility functions
  __tests__/            # Test files

Component Creation

Functional Component Template

import { FC } from 'react';

interface ComponentNameProps {
  title: string;
  onClick?: () => void;
  children?: React.ReactNode;
}

export const ComponentName: FC<ComponentNameProps> = ({
  title,
  onClick,
  children
}) => {
  return (
    <div className="p-4 rounded-lg bg-white shadow-md">
      <h2 className="text-xl font-semibold text-gray-800">{title}</h2>
      {children}
      {onClick && (
        <button
         
          className="mt-4 px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700"
        >
          Click Me
        </button>
      )}
    </div>
  );
};

Context API Pattern

// context/ThemeContext.tsx
import { createContext, useContext, useState, FC, ReactNode } from 'react';

interface ThemeContextType {
  theme: 'light' | 'dark';
  toggleTheme: () => void;
}

const ThemeContext = createContext<ThemeContextType | undefined>(undefined);

export const ThemeProvider: FC<{ children: ReactNode }> = ({ children }) => {
  const [theme, setTheme] = useState<'light' | 'dark'>('light');
  const toggleTheme = () => setTheme(prev => prev === 'light' ? 'dark' : 'light');

  return (
    <ThemeContext.Provider value={{ theme, toggleTheme }}>
      {children}
    </ThemeContext.Provider>
  );
};

export const useTheme = (): ThemeContextType => {
  const context = useContext(ThemeContext);
  if (!context) throw new Error('useTheme must be used within ThemeProvider');
  return context;
};

Tailwind CSS Common Classes

Custom Hooks

useFetch Hook

import { useState, useEffect } from 'react';

export function useFetch<T>(url: string) {
  const [data, setData] = useState<T | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    fetch(url)
      .then(res => res.json())
      .then(setData)
      .catch(err => setError(err.message))
      .finally(() => setLoading(false));
  }, [url]);

  return { data, loading, error };
}

Testing with Vitest

import { describe, it, expect, vi } from 'vitest';
import { render, screen, fireEvent } from '@testing-library/react';
import { Button } from '../components/ui/Button';

describe('Button', () => {
  it('renders with correct text', () => {
    render(<Button>Click Me</Button>);
    expect(screen.getByText('Click Me')).toBeInTheDocument();
  });

  it('calls onClick when clicked', () => {
    const handleClick = vi.fn();
    render(<Button Me</Button>);
    fireEvent.click(screen.getByText('Click Me'));
    expect(handleClick).toHaveBeenCalledTimes(1);
  });
});

Common Commands

npm run dev              # Start dev server
npm run build            # Build for production
npm run test             # Run tests
npm run test:watch       # Run tests in watch mode
npm run lint             # Run ESLint

References

For detailed guides, see:

• references/react-patterns.md - Advanced React patterns
• references/tailwind-guide.md - Tailwind cheatsheet
• references/testing-guide.md - Testing best practices

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