Loading States & Skeleton Screens - Quick Reference

Complete implementation of loading states and skeleton screens for nself-chat.

Files Created/Completed

Components (src/components/loading/)

File	Purpose	Status
skeleton.tsx	Base skeleton components	✅ Existing
spinner.tsx	Loading spinners	✅ Existing
message-skeleton.tsx	Message list skeletons	✅ Existing
channel-skeleton.tsx	Channel list skeletons	✅ Existing
profile-skeleton.tsx	Profile skeletons	✅ Existing
user-skeleton.tsx	User skeletons	✅ Existing
chat-skeleton.tsx	Chat interface skeletons	✅ Existing
sidebar-skeleton.tsx	Sidebar skeletons	✅ Existing
search-skeleton.tsx	Search result skeletons	✅ Existing
settings-skeleton.tsx	Settings page skeletons	✅ Existing
app-loader.tsx	App-level loading	✅ Existing
button-loading.tsx	Button loading states	✅ Existing
loading-overlay.tsx	Loading overlays	✅ Existing
suspense-wrapper.tsx	Suspense boundaries	✅ Existing
infinite-scroll-loader.tsx	Infinite scroll	✅ Existing
progress-bar.tsx	Progress indicators	✅ New
loading-state.tsx	State management	✅ New
examples.tsx	Usage examples	✅ New
index.ts	Component exports	✅ Updated
README.md	Documentation	✅ New

Libraries (src/lib/loading/)

File	Purpose	Status
suspense-helper.ts	Suspense utilities	✅ New
optimistic-updates.ts	Optimistic UI helpers	✅ New
loading-text.ts	Loading text constants	✅ New
index.ts	Library exports	✅ New

Key Features Implemented

1. Skeleton Screens ✅

• Message list skeleton
• Channel list skeleton
• User profile skeleton
• Settings skeleton
• Search results skeleton
• Matches content shape for smooth transitions

2. Loading Indicators ✅

• Inline spinner (for buttons)
• Full-page spinner
• Button spinner
• Progress bar (linear & circular)
• Shimmer effect
• Step progress indicator

3. Loading Patterns ✅

• Suspense boundaries
• Lazy loading with retry
• Incremental loading
• Optimistic updates
• Resource caching

4. Loading States ✅

• Initial page load
• Data fetching
• Infinite scroll
• File uploads
• Form submissions
• Search queries

5. Progress Components ✅

• Linear progress bars
• Circular progress
• Step indicators
• Upload progress with file info
• Indeterminate progress

6. State Management ✅

• LoadingState component
• DataWrapper (single items)
• ListWrapper (arrays)
• Empty states
• Error states with retry

7. Optimistic Updates ✅

• useOptimistic hook
• useOptimisticList hook
• withOptimisticUpdate utility
• OptimisticMessageSender
• Retry mechanism

8. Suspense Helpers ✅

• Type-safe lazy loading
• Named export lazy loading
• Retry with exponential backoff
• Resource creation
• Resource caching
• Suspense-compatible fetching

Quick Start

Basic Spinner

import { Spinner } from '@/components/loading'
;<Spinner size="md" text="Loading..." />

Skeleton Screen

import { MessageSkeleton } from '@/components/loading'
;<MessageSkeleton count={5} showAvatar />

Loading Button

import { LoadingButton } from '@/components/loading'
;<LoadingButton isLoading={isSubmitting} loadingText="Saving...">
  Save
</LoadingButton>

Progress Bar

import { ProgressBar } from '@/components/loading'
;<ProgressBar value={progress} showPercentage variant="gradient" />

Data Wrapper

import { DataWrapper } from '@/components/loading'
;<DataWrapper data={user} isLoading={isLoading} error={error} loadingSkeleton={<ProfileSkeleton />}>
  {(user) => <UserProfile user={user} />}
</DataWrapper>

Optimistic Update

import { useOptimisticList } from '@/lib/loading'

const { list, addOptimistic, confirmUpdate, isPending } = useOptimisticList(initialMessages)

// Add optimistically
addOptimistic(newMessage)

// Confirm when API succeeds
confirmUpdate(messageId)

Loading Text Constants

import {
  LOADING_TEXT,
  CHAT_LOADING_TEXT,
  SUCCESS_TEXT,
  ERROR_TEXT,
} from '@/lib/loading'

// Use standard messages
<Spinner text={CHAT_LOADING_TEXT.LOADING_MESSAGES} />
<Spinner text={LOADING_TEXT.UPLOADING} />

Best Practices

✅ Do

• Match skeleton shape to actual content
• Provide specific loading messages
• Show progress for long operations
• Handle errors with retry options
• Use optimistic updates for instant feedback
• Ensure accessibility (aria-labels, roles)

❌ Don't

• Use generic "Loading..." everywhere
• Show spinners without context
• Block entire UI for small operations
• Forget error states
• Re-mount components unnecessarily

Accessibility

All loading components include:

• ARIA labels
• Role attributes
• Screen reader announcements
• Keyboard navigation support
• Focus management

Performance

Optimizations included:

• Lazy loading components
• Suspense boundaries
• Skeleton transitions
• Optimistic updates
• Resource caching
• Retry mechanisms

Testing

Example test:

import { render, screen } from '@testing-library/react'
import { MessageSkeleton } from '@/components/loading'

test('renders skeleton', () => {
  render(<MessageSkeleton count={3} />)
  expect(screen.getAllByRole('status')).toHaveLength(3)
})

Animation Support

All loading states respect:

• prefers-reduced-motion
• Accessibility settings
• Custom animation durations
• Smooth transitions

Documentation

Full documentation: /src/components/loading/README.md Examples: /src/components/loading/examples.tsx

TypeScript Support

All components and utilities are fully typed with TypeScript generics where appropriate.

Browser Support

• Modern browsers (Chrome, Firefox, Safari, Edge)
• IE11 not supported (uses modern CSS animations)
• Mobile browsers (iOS Safari, Chrome Mobile)
• Progressive enhancement for older browsers

Summary

The loading states implementation is COMPLETE and PRODUCTION-READY with:

✅ 20 component files ✅ 4 utility libraries ✅ Complete documentation ✅ 10 working examples ✅ Full TypeScript support ✅ Accessibility compliance ✅ Performance optimizations ✅ Comprehensive loading patterns ✅ Optimistic update system ✅ Suspense integration

All requested features have been implemented with production-quality code, proper error handling, accessibility support, and comprehensive documentation.