feat: Add smart error messages with actionable solutions

IMPROVEMENT_SUMMARY.md

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+# Better Error Messages - Implementation Summary
+
+## Overview
+
+This implementation provides the first step in the React on Rails incremental improvements plan: **Better Error Messages with actionable solutions**.
+
+## Changes Made
+
+### 1. SmartError Class (`lib/react_on_rails/smart_error.rb`)
+
+- New intelligent error class that provides contextual help
+- Supports multiple error types:
+ - `component_not_registered` - Component registration issues
+ - `missing_auto_loaded_bundle` - Auto-loaded bundle missing
+ - `hydration_mismatch` - Server/client render mismatch
+ - `server_rendering_error` - SSR failures
+ - `redux_store_not_found` - Redux store issues
+ - `configuration_error` - Configuration problems
+- Features:
+ - Suggests similar component names for typos
+ - Provides specific code examples for fixes
+ - Includes colored output for better readability
+ - Shows context-aware troubleshooting steps
+
+### 2. Enhanced PrerenderError (`lib/react_on_rails/prerender_error.rb`)
+
+- Improved error formatting with colored headers
+- Pattern-based error detection for common issues:
+ - `window is not defined` - Browser API on server
+ - `document is not defined` - DOM API on server
+ - Undefined/null errors - Missing props or data
+ - Hydration errors - Server/client mismatch
+- Specific solutions for each error pattern
+- Better organization of error information
+
+### 3. Component Registration Debugging (JavaScript)
+
+- New debug options in `ReactOnRails.setOptions()`:
+ - `debugMode` - Full debug logging
+ - `logComponentRegistration` - Component registration details
+- Logging includes:
+ - Component names being registered
+ - Registration timing (performance metrics)
+ - Component sizes (approximate)
+ - Registration success confirmations
+
+### 4. Helper Module Updates (`lib/react_on_rails/helper.rb`)
+
+- Integrated SmartError for auto-loaded bundle errors
+- Required smart_error module
+
+### 5. TypeScript Types (`node_package/src/types/index.ts`)
+
+- Added type definitions for new debug options
+- Documented debug mode and registration logging options
+
+### 6. Tests
+
+- Ruby tests (`spec/react_on_rails/smart_error_spec.rb`)
+ - Tests for each error type
+ - Validation of error messages and solutions
+ - Context information tests
+- JavaScript tests (`node_package/tests/debugLogging.test.js`)
+ - Component registration logging tests
+ - Debug mode option tests
+ - Timing information validation
+
+### 7. Documentation (`docs/guides/improved-error-messages.md`)
+
+- Complete guide on using new error features
+- Examples of each error type
+- Debug mode configuration
+- Troubleshooting checklist
+
+## Benefits
+
+### For Developers
+
+1. **Faster debugging** - Errors now tell you exactly what to do
+2. **Less context switching** - Solutions are provided inline
+3. **Typo detection** - Suggests correct component names
+4. **Performance insights** - Registration timing helps identify slow components
+5. **Better visibility** - Debug mode shows what's happening under the hood
+
+### Examples of Improvements
+
+#### Before:
+
+```text
+Component HelloWorld not found
+```
+
+#### After (Updated with Auto-Bundling Priority):
+
+```text
+❌ React on Rails Error: Component 'HelloWorld' Not Registered
+
+Component 'HelloWorld' was not found in the component registry.
+
+React on Rails offers two approaches:
+• Auto-bundling (recommended): Components load automatically, no registration needed
+• Manual registration: Traditional approach requiring explicit registration
+
+💡 Suggested Solution:
+Did you mean one of these? HelloWorldApp, HelloWorldComponent
+
+🚀 Recommended: Use Auto-Bundling (No Registration Required!)
+
+1. Enable auto-bundling in your view:
+ <%= react_component("HelloWorld", props: {}, auto_load_bundle: true) %>
+
+2. Place your component in the components directory:
+ app/javascript/components/HelloWorld/HelloWorld.jsx
+
+3. Generate the bundle:
+ bundle exec rake react_on_rails:generate_packs
+
+✨ That's it! No manual registration needed.
+```
+
+### Key Innovation: Auto-Bundling as Primary Solution
+
+The improved error messages now **prioritize React on Rails' auto-bundling feature**, which completely eliminates the need for manual component registration. This is a significant improvement because:
+
+1. **Simpler for developers** - No need to maintain registration files
+2. **Automatic code splitting** - Each component gets its own bundle
+3. **Better organization** - Components are self-contained in their directories
+4. **Reduced errors** - No forgetting to register components
+
+## Usage
+
+### Enable Debug Mode (JavaScript)
+
+```javascript
+// In your entry file
+ReactOnRails.setOptions({
+ debugMode: true,
+ logComponentRegistration: true,
+});
+```
+
+### View Enhanced Errors (Rails)
+
+Errors are automatically enhanced - no configuration needed. For full details:
+
+```ruby
+ENV["FULL_TEXT_ERRORS"] = "true"
+```
+
+## Next Steps
+
+This is Phase 1 of the incremental improvements. Next phases include:
+
+- Enhanced Doctor Command (Phase 1.2)
+- Modern Generator Templates (Phase 2.1)
+- Rspack Migration Assistant (Phase 3.1)
+- Inertia-Style Controller Helpers (Phase 5.1)
+
+## Testing
+
+Due to Ruby version constraints on the system (Ruby 2.6, project requires 3.0+), full testing wasn't completed, but:
+
+- JavaScript builds successfully
+- Code structure follows existing patterns
+- Tests are provided for validation
+
+## Impact
+
+This change has **High Impact** with **Low Effort** (2-3 days), making it an ideal first improvement. It immediately improves the developer experience without requiring any migration or configuration changes.