react

import React, { lazy, Suspense, useState, useEffect } from 'react';

// 1. Component lazy loading
const HeavyComponent = lazy(() => import('./HeavyComponent'));
const AdminPanel = lazy(() => import('./AdminPanel'));
const Dashboard = lazy(() => import('./Dashboard'));

import React, { useState, useEffect, useCallback, useMemo, useRef, useContext } from 'react';

// 1. useState - managing component state
function Counter() {
  const [count, setCount] = useState(0);
  const [name, setName] = useState('');

export const initialState = (steps, initialData = {}) => ({
  steps,
  stepIndex: 0,
  data: initialData,
  errors: {},
});

import { ReactNode, useEffect, useState } from 'react'
import { createPortal } from 'react-dom'

interface PortalProps {
  children: ReactNode
  container?: Element

import { Link, useLocation, useMatches } from 'react-router-dom'

interface BreadcrumbMatch {
  pathname: string
  handle?: {
    crumb?: (data?: any) => string

export interface Todo {
  id: string;
  title: string;
  done: boolean;
}

import React, { createContext, useContext, useState, ReactNode } from 'react'

interface TabsContextType {
  activeTab: string
  setActiveTab: (tab: string) => void
}

import { createContext } from "react";

export type ToastVariant = "info" | "success" | "error";

export interface Toast {
  id: string;

import { useState, useRef, useEffect, useCallback } from "react";

export function useCarousel(length, { delay = 4000 } = {}) {
  const [index, setIndex] = useState(0);
  const [paused, setPaused] = useState(false);
  const savedCallback = useRef(null);

const { EventEmitter } = require('events');

class NotificationBus extends EventEmitter {
  constructor(bufferSize = 100) {
    super();
    this.setMaxListeners(0);

export class TimeoutError extends Error {
  constructor(public readonly ms: number) {
    super(`Request timed out after ${ms}ms`);
    this.name = "TimeoutError";
  }
}

import { Link } from 'react-router-dom'
import { useQueryClient } from '@tanstack/react-query'
import api from '@/services/api'
import { PostId } from '@/types'

interface PostLinkProps {