Code Snippets

<script setup lang="ts">
  import { ref, reactive } from 'vue';
  
  // Reactive primitive with explicit type (ref for primitives)
  const count = ref<number>(0);
  const username = ref<string>('John Doe');
  const isAuthenticated = ref<boolean>(false);
  

<script setup lang="ts">
  import { ref, watch, computed } from 'vue';
  
  // Typed form state
  interface LoginForm {
    email: string;
    password: string;
  }

<script setup lang="ts">
  import { ref, onMounted, onUnmounted } from 'vue';
  
  const countdown = ref<number>(60);
  let timer: NodeJS.Timeout | null = null;
  let abortController: AbortController | null = null;
  
  // Simulate API call with abort capability

<script setup lang="ts">
  import axios, { AxiosInstance, AxiosRequestConfig, AxiosResponse, AxiosError } from 'axios';
  import { ref, onMounted } from 'vue';
  
  // Typed API response (matches enterprise API wrapper format)
  interface ApiResponse<T = unknown> {
    success: boolean;
    data: T;

// stores/authStore.ts (Pinia store - separate file for enterprise structure)
  import { defineStore } from 'pinia';
  import { ref, computed } from 'vue';
  
  // Typed user state
  interface User {
    id: number;
    name: string;

<script setup lang="ts">
  import { ref, computed, onMounted } from 'vue';
  
  // Typed data type
  interface Product {
    id: number;
    name: string;
    price: number;

<script setup lang="ts">
    import { ref, watch, onMounted, onUnmounted, defineProps, defineEmits } from 'vue';
    
    // Typed props for modal component
    const props = defineProps<{
      isOpen: boolean;
      title: string;
      closeOnOverlayClick?: boolean;

<script setup lang="ts">
    import { ref, onMounted, onUnmounted, computed } from 'vue';
    
    // Typed item interface
    interface Item {
      id: number;
      title: string;
      description: string;

<script setup lang="ts">
import { ref, onMounted, onUnmounted, watch } from 'vue';
import axios from 'axios';

// Typed JWT payload interface
interface JwtPayload {
  sub: string; // User ID
  name: string; // User name

<script setup lang="ts">
import { ref, onMounted, onUnmounted, defineProps, defineEmits } from 'vue';

// Typed error interface
interface AppError {
  message: string;
  stack?: string;
  component?: string;

<script setup lang="ts">
    import { ref, computed, watch, onUnmounted } from 'vue';
    import { debounce } from 'lodash-es';
  
    // Type definitions
    interface SearchResult {
      id: string;
      label: string;

<script setup lang="ts">
    import { ref, computed, watch } from 'vue';
  
    // Type definitions
    interface TableColumn<T> {
      key: keyof T;
      label: string;
      sortable?: boolean;

<script setup lang="ts">
    import { ref, watch, onMounted } from 'vue';
    import { Draggable } from 'vue-draggable-next';
  
    // Type definitions
    interface DraggableItem {
      id: string;
      title: string;

<script setup lang="ts">
    import { ref, computed, watch, onUnmounted } from 'vue';
  
    // Type definitions
    interface UploadedImage {
      id: string;
      file: File;
      previewUrl: string;

<script setup lang="ts">
  import { ref, watch, onMounted, onUnmounted, computed } from 'vue';

  // Type definitions
  type Theme = 'light' | 'dark' | 'system';
  type ResolvedTheme = 'light' | 'dark';

  // State

<script setup lang="ts">
  import { ref, reactive, onMounted, onUnmounted } from 'vue';
  import axios, { AxiosRequestConfig, AxiosError } from 'axios';

  // Type definitions for API client
  interface CacheEntry<T> {
    data: T;
    timestamp: number;

<script setup lang="ts">
  import { ref, reactive, onMounted, onUnmounted, watch } from 'vue';
  import axios from 'axios';

  // Type definitions for WebSocket client
  interface WsMessage<T = any> {
    type: string;
    payload: T;

<script setup lang="ts">
  import { ref, reactive, onMounted, onUnmounted, watch, nextTick } from 'vue';
  import axios from 'axios';

  // Type definitions for GraphQL Client
  interface GraphQLRequest {
    id: string;
    query: string;

<script setup lang="ts">
  import { ref, reactive, onUnmounted, watch } from 'vue';
  import axios from 'axios';
  import { createHash } from 'crypto'; // Node.js: crypto, Browser: crypto.subtle

  // Type definitions for file upload
  interface ChunkInfo {
    chunkId: string;

<script setup lang="ts">
  import { ref, watch, onUnmounted } from 'vue';
  import axios from 'axios';

  // Core throttling/debouncing API client (minified version)
  class ThrottledApiClient {
    private throttleTimers = new Map<string, NodeJS.Timeout>();
    private debounceTimers = new Map<string, NodeJS.Timeout>();

<script setup lang="ts">
  import { ref, onUnmounted } from 'vue';
  import axios from 'axios';

  // Circuit Breaker States
  type CircuitState = 'closed' | 'open' | 'half-open';

  // Core Retry + Circuit Breaker Client

<script setup lang="ts">
  import { ref, onUnmounted } from 'vue';
  import axios from 'axios';

  // Core Cancellable API Client
  class CancellableApiClient {
    private controllers = new Map<string, AbortController>();
    private timeoutTimers = new Map<string, NodeJS.Timeout>();

<script setup lang="ts">
  import { defineEmits } from 'vue';
  
  // Type-safe custom events with payload types
  const emit = defineEmits<{
    // Event name: [payload type]
    'user-selected': [userId: number];
    'filter-changed': [filters: { search: string; active: boolean }];

<script setup lang="ts">
  // Define union type for different states
  type LoadingState = { type: 'loading' };
  type SuccessState = { type: 'success'; data: string[] };
  type ErrorState = { type: 'error'; message: string };
  type DataState = LoadingState | SuccessState | ErrorState;

  // Type guard functions (type predicates)

<script setup lang="ts">
  // Generic composable for data transformation
  const useDataTransformer = <T>() => {
    // Generic function to filter array items by a property
    const filterByProperty = (
      items: T[], 
      property: keyof T, 
      value: T[keyof T]

<script setup lang="ts">
  // Define strict interface for component props
  interface ProductCardProps {
    id: number;
    title: string;
    price: number;
    discount?: number; // Optional prop
    isInStock: boolean;

<script setup lang="ts">
  // Generic utility: Deep clone any type of object/array (type-safe)
  const deepClone = <T>(data: T): T => {
    if (data === null || typeof data !== 'object') return data;
    if (data instanceof Date) return new Date(data.getTime()) as T;
    if (data instanceof Array) return data.map(item => deepClone(item)) as T;
    return Object.fromEntries(
      Object.entries(data as Record<string, unknown>).map(([key, value]) => [key, deepClone(value)])

<script setup lang="ts">
  import { ref, onMounted, onUnmounted } from 'vue';

  // Type-safe template refs for DOM elements
  const inputRef = ref<HTMLInputElement | null>(null);
  const containerRef = ref<HTMLDivElement | null>(null);
  const resizeObserver = ref<ResizeObserver | null>(null);

<script setup lang="ts">
  import { ref, computed } from 'vue';

  // Define strict interface for dynamic component props
  interface DynamicComponentProps {
    id: string;
    title: string;
    content: string;

<script setup lang="ts">
  import { ref, computed } from 'vue';

  // Template literal type for currency codes (type constraint)
  type CurrencyCode = `${'USD' | 'EUR' | 'GBP' | 'JPY'}`;
  // Template literal type for date formats
  type DateFormat = 'dd/mm/yyyy' | 'mm/dd/yyyy' | 'yyyy-mm-dd' | 'dd-mmm-yyyy';
  // Template literal type for number formats

<script setup lang="ts">
  import { ref, computed } from 'vue';

  // Custom typed error classes (extending Error)
  class ApiError extends Error {
    public readonly type = 'api_error' as const;
    public statusCode: number;
    public endpoint: string;

<script setup lang="ts">
  import { ref, computed, onMounted, onUnmounted, watch } from 'vue';

  interface VirtualListProps {
    items: any[];
    itemHeight: number;
    containerHeight?: number;
  }

<script setup lang="ts">
  import { ref, computed } from 'vue';

  interface LazyImageProps {
    src: string;
    alt: string;
    lqipSrc?: string; // Low Quality Image Placeholder
    width?: number | string;

<script setup lang="ts">
  // Centralized type-safe breakpoints (maintainable single source of truth)
  type BreakpointKey = 'xs' | 'sm' | 'md' | 'lg' | 'xl';
  type Breakpoints = Record<BreakpointKey, number>;

  const BREAKPOINTS: Breakpoints = {
    xs: 0,
    sm: 640,

<script setup lang="ts">
  import { ref, watch, onMounted, onBeforeUnmount } from 'vue';
  
  // Example state that influences the tab title
  const unreadCount = ref<number>(3);
  const baseTitle = 'Inbox';
  
  // Store the title that existed before this component mounted

<script setup lang="ts">
  import { ref, onMounted, onUnmounted } from 'vue';
  
  // Minimal typing to keep the snippet self-contained across TS configs
  type IdleDeadlineLike = { didTimeout: boolean; timeRemaining: () => number };
  type IdleHandle = number;
  
  const status = ref<'idle' | 'scheduled' | 'running' | 'done' | 'canceled'>('idle');

<script setup lang="ts">
  import { computed, onMounted, onUnmounted, ref } from 'vue';
  
  const isRunning = ref<boolean>(true);
  const progress = ref<number>(0); // 0..100
  
  let rafId: number | null = null;
  let startTs: number | null = null;

<script setup lang="ts">
  import { onMounted, onUnmounted, ref } from 'vue';
  
  type Message =
    | { type: 'logout' }
    | { type: 'toast'; text: string; ts: number };
  
  const lastMessage = ref<string>('No messages yet');

<script setup lang="ts">
  import { onMounted, onUnmounted, ref } from 'vue';
  
  const containerRef = ref<HTMLDivElement | null>(null);
  const mutationCount = ref<number>(0);
  const lastAction = ref<string>('No mutations yet');
  
  let observer: MutationObserver | null = null;

<script setup lang="ts">
  import { computed, onUnmounted, ref } from 'vue';
  
  type WorkerInMessage =
    | { type: 'start'; n: number; chunkSize: number }
    | { type: 'cancel' };
  
  type WorkerOutMessage =

<script setup lang="ts">
  import { computed, markRaw, shallowRef } from 'vue';
  
  interface Row {
    id: number;
    name: string;
    amount: number;
  }

<script setup lang="ts">
  import { ref } from 'vue';
  
  interface Item {
    id: number;
    label: string;
  }
  

<script setup lang="ts">
  import { computed, onUnmounted, ref, watch } from 'vue';
  
  interface User {
    id: number;
    name: string;
    email: string;
  }

<script setup lang="ts">
  import { ref } from 'vue';
  
  const size = ref<number>(120_000);
  const lastMs = ref<number | null>(null);
  const lastMax = ref<number | null>(null);
  
  const run = (): void => {

<script setup lang="ts">
  import { computed, onUnmounted, ref } from 'vue';
  
  interface User {
    id: number;
    name: string;
  }
  

<script setup lang="ts">
  import { computed, ref } from 'vue';
  
  interface HistoryState<T> {
    past: T[];
    present: T;
    future: T[];
    max: number;

<script setup lang="ts">
  import { computed, reactive, ref } from 'vue';
  
  type TaskId = string;
  
  interface Task {
    id: TaskId;
    title: string;

<script setup lang="ts">
  import { reactive, ref } from 'vue';
  
  interface Post {
    id: number;
    title: string;
    liked: boolean;
    likes: number;

<script setup lang="ts">
  import { onBeforeUnmount, onMounted, ref, watch } from 'vue';
  
  type Stored<T> = { __v: number; data: T };
  
  type Options<T> = {
    key: string;
    version: number;