docs: enhance dynamic-remotes example documentation and modernization guide

[ScriptedAlchemy]

Summary

• Enhanced README documentation for the dynamic-remotes example with comprehensive coverage
• Added architecture overview explaining host/remote patterns and dynamic loading flow
• Documented current implementation patterns and Module Federation concepts
• Identified critical issues requiring modernization (React 16→18+, hardcoded URLs, missing error handling)
• Provided detailed modernization roadmap with priority matrix and implementation timeline
• Added troubleshooting guide and best practices section

Key Improvements

• Architecture Documentation: Clear explanation of 3-app structure and dynamic loading flow
• Setup Instructions: Comprehensive steps for Rspack, Webpack, and production modes
• Issue Identification: Critical problems like outdated React version and hardcoded configurations
• Modernization Roadmap: Prioritized improvement plan with code examples
• Best Practices: Guidelines for production-ready Module Federation implementations
• Troubleshooting: Common issues and solutions with code snippets

Test plan

• Documentation accurately reflects current codebase structure
• Setup instructions verified against existing configuration
• All links and code examples properly formatted
• Modernization recommendations align with Module Federation best practices
• Troubleshooting section addresses common developer pain points

🤖 Generated with Claude Code

To fix the problem, simply remove the unused import statement for Constants from ./utils/constants on line 3 of advanced-api/dynamic-remotes/e2e/checkDynamicRemotesApps.spec.ts. This will clean up the code, making it clearer and easier to maintain, without affecting any existing functionality, since Constants is not referenced anywhere in the shown code.

[Copilot]

Pull Request Overview

This PR enhances the dynamic-remotes example with comprehensive documentation and modernizes the codebase to address critical issues. The PR provides detailed technical documentation explaining Module Federation's dynamic loading capabilities while upgrading the outdated React implementation and improving the testing infrastructure.

• Enhanced Documentation: Added comprehensive README with architecture overview, setup instructions, troubleshooting guide, and modernization roadmap
• React 18 Migration: Upgraded from React 16.13.0 to 18.3.1 across all applications with proper createRoot API usage
• Testing Modernization: Migrated from Cypress to Playwright for improved E2E testing with better cross-browser support

Reviewed Changes

Copilot reviewed 23 out of 24 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
README.md	Complete documentation overhaul with architecture diagrams, setup instructions, and modernization guidance
package.json files	React version upgrades from 16.13.0 to 18.3.1 across all applications
bootstrap.js files	Migration from ReactDOM.render to createRoot API for React 18 compatibility
webpack/rspack configs	Updated shared dependencies configuration with strict versioning and JSX runtime support
app1/src/App.js	Enhanced error handling, loading states, and environment-based remote URL configuration
e2e test files	Complete migration from Cypress to Playwright with comprehensive test coverage
CI workflow	Updated GitHub Actions to support Playwright testing infrastructure

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

advanced-api/dynamic-remotes/e2e/checkDynamicRemotesApps.spec.ts:315

• [nitpick] The timeout of 8000ms for dynamic loading seems arbitrary and may be too generous or strict depending on network conditions. Consider using a more realistic timeout based on actual performance requirements or making it configurable.

      expect(dynamicLoadTime).toBeLessThan(8000); // Dynamic loading should be fast

[Copilot]

The getRemoteEntry function constructs URLs without proper validation, which could lead to URL injection vulnerabilities. Consider validating the port parameter and sanitizing the baseUrl to ensure it's a valid origin.

Suggested change

	return `${baseUrl}:${port}/remoteEntry.js`;
	// Validate port: must be integer between 1 and 65535
	const portNum = Number(port);
	if (!Number.isInteger(portNum) || portNum < 1 || portNum > 65535) {
	throw new Error(`Invalid port: ${port}`);
	}
	// Validate baseUrl: must be a valid origin (scheme + host, no path/query/fragment)
	let origin;
	try {
	const url = new URL(baseUrl);
	// Only allow if baseUrl is origin (no path/query/fragment)
	if (url.pathname !== '/' || url.search || url.hash) {
	throw new Error();
	}
	origin = url.origin;
	} catch {
	throw new Error(`Invalid baseUrl: ${baseUrl}`);
	}
	return `${origin}:${portNum}/remoteEntry.js`;

[Copilot]

Console.log statements should be removed or replaced with a proper logging solution in production code. Consider using a conditional logger or removing debug statements for production builds.

Suggested change

	console.log(`Successfully loaded: ${scope}/${module}`);
	if (process.env.NODE_ENV !== 'production') {
	console.log(`Loading remote module: ${scope}/${module}`);
	}
	const { default: Component } = await loadRemote(`${scope}/${module}`);
	if (process.env.NODE_ENV !== 'production') {
	console.log(`Successfully loaded: ${scope}/${module}`);
	}

[Copilot]

Fixed timeout waits can cause flaky tests and unnecessary delays. Consider using more specific waits like waitForSelector or waitForFunction with meaningful conditions instead of arbitrary timeouts.

Suggested change

	await this.page.waitForTimeout(2000);
	// Wait for module federation to load by checking for federated component root elements
	await this.page.waitForFunction(() => {
	// Adjust the selector(s) below to match the root of your federated components
	// For example, look for a known federated component or a specific attribute/class
	return !!document.querySelector('[data-federated-root], .federated-component, h1, h2, button, p');
	}, { timeout: 30000 });