frontend-technologies

name	frontend-technologies
description	Master modern frontend technologies including React, Vue, Angular, TypeScript, Next.js, CSS architecture, and responsive design. Use when working with frontend frameworks, styling, or browser APIs.

Frontend Technologies

Quick Start

React Basics

import React, { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>
        Increment
      </button>
    </div>
  );
}

Vue 3 Composition API

import { ref } from 'vue';

export default {
  setup() {
    const count = ref(0);

    return {
      count,
      increment: () => count.value++
    };
  }
};

TypeScript with React

interface Props {
  message: string;
  onSubmit: (value: string) => void;
}

const MyComponent: React.FC<Props> = ({ message, onSubmit }) => {
  return <div onClick={() => onSubmit(message)}>{message}</div>;
};

Core Frameworks

React Ecosystem

• Hooks: useState, useEffect, useContext, useReducer, useCallback, useMemo
• State Management: Redux, Zustand, Jotai, Recoil
• Server Frameworks: Next.js with App Router and Server Components
• Form Libraries: React Hook Form, Formik
• Testing: Jest, React Testing Library, Cypress, Playwright
• Build Tools: Vite, Webpack, Turbopack

Vue.js Specialization

• Composition API: Advanced reactivity and composables
• Component Patterns: Scoped slots, render functions, renderless components
• State Management: Pinia (modern Vuex alternative)
• Routing: Vue Router 4 with nested routes
• Meta Frameworks: Nuxt for SSR and static generation
• Build Optimization: Vite for rapid development

Angular Enterprise Development

• Dependency Injection: Services, providers, tokens
• RxJS: Observables, operators, subjects
• Forms: Reactive forms with FormBuilder
• HTTP Client: Interceptors and error handling
• Testing: Jasmine, Karma, Jest
• Modules: Feature modules, shared modules, lazy loading

Modern CSS

CSS Architecture

/* BEM Naming Convention */
.card { }
.card__header { }
.card__header--highlighted { }

/* CSS Variables */
:root {
  --primary-color: #007bff;
  --spacing-unit: 8px;
}

.button {
  background: var(--primary-color);
  padding: calc(var(--spacing-unit) * 2);
}

Advanced Techniques

• Flexbox & Grid: Advanced layouts, subgrid, alignment
• CSS-in-JS: Styled Components, Emotion, Tailwind
• Animation: Transitions, keyframes, animation libraries
• Responsive Design: Mobile-first, fluid typography, container queries
• Performance: Critical CSS, CSS loading optimization
• Accessibility: Color contrast, focus states, ARIA attributes

Component Architecture

Design Patterns

• Presentational/Container Components: Separation of concerns
• Compound Components: Complex component interactions
• Render Props: Component logic reuse
• Custom Hooks: Encapsulated component logic
• Higher-Order Components: Wrapper patterns
• Slots: Flexible component composition

Component Libraries

• Material-UI: Enterprise component system
• Chakra UI: Accessible component library
• Headless UI: Unstyled accessible components
• Storybook: Component documentation and testing

TypeScript Mastery

Advanced Types

// Union and Intersection Types
type Success = { status: 'success'; data: unknown };
type Error = { status: 'error'; message: string };
type Result = Success | Error;

// Generics
function process<T, K extends keyof T>(obj: T, key: K): T[K] {
  return obj[key];
}

// Conditional Types
type Flatten<T> = T extends Array<infer U> ? U : T;

// Utility Types
type Partial<T> = { [K in keyof T]?: T[K] };
type Readonly<T> = { readonly [K in keyof T]: T[K] };

Performance Optimization

Techniques

• Code Splitting: Route-based and component-based splitting
• Lazy Loading: React.lazy, dynamic imports
• Memoization: React.memo, useMemo, useCallback
• Bundle Analysis: webpack-bundle-analyzer
• Image Optimization: Next.js Image, WebP, responsive images
• Core Web Vitals: LCP, FID, CLS optimization

Resources

• React Docs: https://react.dev
• Vue Docs: https://vuejs.org
• Angular Docs: https://angular.io
• TypeScript Handbook: https://www.typescriptlang.org/docs/
• MDN Web Docs: https://developer.mozilla.org
• Web Fundamentals: https://web.dev

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See Also: design-system, responsive-design-patterns