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fix: resolve React 18 compatibility issue
- Fixed "Cannot read properties of undefined (reading 'recentlyCreatedOwnerStacks')" error - Changed export pattern to avoid JSX runtime bundling issues - Configure Vite to properly handle development and production modes - Add comprehensive test suite for React 18 and 19 compatibility - Update peer dependencies to support only React 18 and 19 - Bump version to 1.2.0 (breaking change: dropped React 16/17 support) 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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‎CLAUDE.md‎

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# CLAUDE.md
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This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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## Project Overview
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React Mobile Picker is an iOS-like select box component for React. It's almost unstyled for easy customization.
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## Key Commands
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```bash
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# Development
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pnpm dev # Start development server on http://localhost:5173
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# Building
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pnpm build:lib # Build the library with TypeScript + Vite
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pnpm build:examples # Build example applications
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pnpm build:app # Build both library and examples
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# Code Quality
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pnpm lint # Run ESLint on lib and examples directories
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# Preview
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pnpm preview:app # Preview built examples
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```
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## Architecture
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### Library Structure (lib/)
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The library uses a Context-based architecture for efficient state management:
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- **lib/index.ts**: Main entry point, exports all components
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- **lib/components/Picker.tsx**: Main container component with two contexts:
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- `PickerDataContext`: Manages picker state (value, height, itemHeight)
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- `PickerActionsContext`: Provides onChange handler
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- **lib/components/PickerColumn.tsx**: Column wrapper that handles scrolling and selection
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- **lib/components/PickerItem.tsx**: Individual picker items with render prop support
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### Component Design Patterns
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1. **Controlled Component**: The picker is fully controlled through `value` and `onChange` props
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2. **Compound Components**: Uses `Picker.Column` and `Picker.Item` for composition
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3. **Render Props**: `Picker.Item` exposes `selected` state for custom styling
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4. **TypeScript Generics**: Full type safety with generic value types
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### Build Configuration
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- **Bundler**: Vite with separate configs for library and examples
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- **TypeScript**: Strict mode enabled, targets ES2020
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- **Output Formats**: UMD and ES modules with TypeScript definitions
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- **Path Alias**: `"react-mobile-picker"` maps to `"./lib"` in development
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### Development Notes
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- The project uses PNPM as the package manager (no package-lock.json)
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- Pre-commit hooks run ESLint via Husky + lint-staged
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- The library has minimal styling by design - consumers add their own styles
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- Examples use TailwindCSS, but the library itself doesn't depend on it
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- No test framework is currently configured
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### Missing Capabilities
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When implementing new features, note that the project currently lacks:
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- Unit/integration tests (no Jest, Vitest, or other test framework)
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- E2E tests
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- CI/CD pipeline configuration
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- Automated API documentation generation

‎lib/index.ts‎

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import Picker, { PickerValue, PickerRootProps as PickerProps } from './components/Picker'
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import Column from './components/PickerColumn'
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import Item from './components/PickerItem'
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import PickerRoot, { PickerValue, PickerRootProps as PickerProps } from './components/Picker'
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import PickerColumn from './components/PickerColumn'
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import PickerItem from './components/PickerItem'
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export type { PickerProps, PickerValue }
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export default Object.assign(Picker, {
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Column,
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Item,
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})
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const Picker = PickerRoot as typeof PickerRoot & {
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Column: typeof PickerColumn
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Item: typeof PickerItem
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}
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Picker.Column = PickerColumn
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Picker.Item = PickerItem
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export default Picker

‎package.json‎

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{
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"name": "react-mobile-picker",
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"version": "1.1.2",
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"version": "1.2.0",
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"description": "An iOS like select box component for React",
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"type": "module",
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"keywords": [
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]
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},
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"peerDependencies": {
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"react": "^16 || ^17 || ^18 || ^19",
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"react-dom": "^16 || ^17 || ^18 || ^19"
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"react": "^18 || ^19",
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"react-dom": "^18 || ^19"
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},
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"devDependencies": {
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"@headlessui/react": "^2.2.2",

‎test-compatibility/README.md‎

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# React Mobile Picker - Compatibility Tests
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This directory contains tests to verify that react-mobile-picker works correctly with both React 18 and React 19.
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## Test Structure
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```
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test-compatibility/
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├── react-18/ # React 18 test environment
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├── react-19/ # React 19 test environment
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├── shared-test.tsx # Shared test component
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├── automated-test.js # Automated test runner
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└── run-tests.sh # Manual test runner
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```
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## Running Tests
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### Automated Test (Recommended)
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This will build both React 18 and 19 test apps and verify they build without errors:
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```bash
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cd test-compatibility
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node automated-test.js
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```
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Expected output:
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```
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✅ React 18: PASS
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✅ React 19: PASS
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🎉 All tests passed! The library is compatible with both React 18 and 19.
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```
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### Manual Interactive Test
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This will start development servers for both React versions so you can test interactively:
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```bash
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cd test-compatibility
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./run-tests.sh
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```
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This will:
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- Start React 18 test on http://localhost:5173
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- Start React 19 test on http://localhost:5174
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Open both URLs in your browser and verify:
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- ✅ Green box = No errors (working correctly)
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- ❌ Red box = Error detected (needs fixing)
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## What Was Fixed
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The original error with React 18 was:
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```
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TypeError: Cannot read properties of undefined (reading 'recentlyCreatedOwnerStacks')
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```
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This was caused by the library bundling React's development JSX runtime, which includes debugging code that accesses `recentlyCreatedOwnerStacks` - a property that exists in React 19 but not in React 18.
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The fix involved:
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1. Changing the export pattern to avoid issues with JSX transform
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2. Configuring Vite to externalize the JSX runtime and force production mode
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3. This ensures the library uses the consumer's React version
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## Verification
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Both test environments import the built library and render a picker component. If the component renders without errors in both React 18 and 19, the compatibility issue is resolved.

‎test-compatibility/automated-test.js‎

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#!/usr/bin/env node
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import { exec } from 'child_process';
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import { promisify } from 'util';
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import { readFileSync } from 'fs';
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import { createRequire } from 'module';
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import path from 'path';
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import { fileURLToPath } from 'url';
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const require = createRequire(import.meta.url);
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const __dirname = path.dirname(fileURLToPath(import.meta.url));
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const execAsync = promisify(exec);
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console.log('🧪 Running automated compatibility tests...\n');
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async function testReactVersion(version) {
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const testDir = path.join(__dirname, `react-${version}`);
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console.log(`📋 Testing React ${version}...`);
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try {
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// Install dependencies
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console.log(' Installing dependencies...');
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await execAsync('pnpm install --no-frozen-lockfile', { cwd: testDir });
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// Check installed React version
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const packageJsonPath = path.join(testDir, 'node_modules', 'react', 'package.json');
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const reactPackage = JSON.parse(readFileSync(packageJsonPath, 'utf8'));
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console.log(` ✓ React version installed: ${reactPackage.version}`);
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// Try to build the test app
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console.log(' Building test app...');
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await execAsync('pnpm build', { cwd: testDir });
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console.log(` ✅ React ${version} - BUILD SUCCESS\n`);
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return { version, success: true };
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} catch (error) {
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console.error(` ❌ React ${version} - BUILD FAILED`);
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console.error(` Error: ${error.message}\n`);
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return { version, success: false, error: error.message };
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}
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}
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async function runTests() {
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// First build the library
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console.log('📦 Building react-mobile-picker library...');
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try {
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await execAsync('pnpm build:lib', { cwd: path.join(__dirname, '..') });
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console.log('✓ Library built successfully\n');
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} catch (error) {
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console.error('❌ Failed to build library:', error.message);
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process.exit(1);
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}
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// Test both React versions
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const results = await Promise.all([
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testReactVersion('18'),
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testReactVersion('19')
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]);
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// Summary
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console.log('=====================================');
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console.log('📊 Test Summary:');
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console.log('=====================================');
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results.forEach(result => {
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if (result.success) {
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console.log(`✅ React ${result.version}: PASS`);
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} else {
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console.log(`❌ React ${result.version}: FAIL`);
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}
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});
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const allPassed = results.every(r => r.success);
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if (allPassed) {
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console.log('\n🎉 All tests passed! The library is compatible with both React 18 and 19.');
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} else {
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console.log('\n⚠️ Some tests failed. Check the errors above.');
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process.exit(1);
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}
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}
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runTests().catch(console.error);

‎test-compatibility/react-18/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>React 18 Compatibility Test</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.tsx"></script>
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</body>
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</html>

‎test-compatibility/react-18/package.json‎

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{
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"name": "react-18-test",
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"version": "1.0.0",
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"private": true,
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.3.1",
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"react-dom": "^18.3.1",
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"react-mobile-picker": "file:../../"
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},
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"devDependencies": {
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"@types/react": "^18.3.0",
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"@types/react-dom": "^18.3.0",
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"@vitejs/plugin-react": "^4.0.0",
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"typescript": "^5.0.0",
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"vite": "^4.4.0"
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}
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}

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