react

import { z } from "zod";

export const signupSchema = z
  .object({
    email: z.string().min(1, "Email is required").email("Enter a valid email"),
    username: z

export const required = (msg = 'This field is required') => (value) =>
  value && value.trim() !== '' ? '' : msg;

export const minLength = (n, msg) => (value) =>
  value && value.length >= n ? '' : msg || `Must be at least ${n} characters`;

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

type Patch = Record<string, string | null | undefined>;

function readParams(): URLSearchParams {
  return new URLSearchParams(window.location.search);

import { Suspense } from 'react'
import { useSuspenseQuery } from '@tanstack/react-query'
import { useParams } from 'react-router-dom'
import api from '@/services/api'
import { Post } from '@/types'
import { ErrorBoundary } from '@/components/ErrorBoundary'

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 function clamp(value, min, max) {
  return Math.min(Math.max(value, min), max);
}

export function move(list, from, to) {
  const next = list.slice();

import { useReducer, useCallback } from 'react';

const initialState = (present) => ({ past: [], present, future: [] });

function historyReducer(state, action) {
  const { past, present, future } = state;

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 const wizardMachine = {
  initial: 'account',
  states: {
    account: {
      next: 'profile',
      canLeave: (data) => Boolean(data.email && data.password),