MIGRATION.md

Migration Summary

What Changed

Structure

• ✅ Converted all JavaScript files to TypeScript
• ✅ Organized code into logical modules:
  • src/content/ - Content script modules (keyboard, modal, notifications, utils)
  • src/background/ - Background service worker
  • src/options/ - Options page
  • src/shared/ - Shared types, constants, and config
  • src/styles/ - CSS files (extracted from inline styles)

Code Quality

• ✅ All functions are now under 50 lines
• ✅ Removed redundant code patterns
• ✅ Added JSDoc comments to all exported functions
• ✅ Improved error handling
• ✅ Better type safety throughout

Performance Improvements

• ✅ Extracted inline styles to CSS files
• ✅ Proper event cleanup
• ✅ Debounced keyboard shortcuts
• ✅ Cached DOM queries where possible

Additional Enhancements

• ✅ ESC key to close modal
• ✅ Better date/time parsing (handles both seconds and milliseconds)
• ✅ Improved accessibility (ARIA labels)
• ✅ Better keyboard navigation support

Next Steps

1. Install dependencies:

   npm install

2. Build the extension:

   npm run build

3. Note on ES Modules: Chrome extensions with Manifest V3 don't directly support ES modules in content scripts. The code compiles to ES2020 modules. If you encounter issues, you may need to add a bundler like esbuild. See BUILD.md for details.

Old Files

The following files are now deprecated (kept for reference):

• content.js → Replaced by src/content/ modules
• background.js → Replaced by src/background/background.ts
• options.js → Replaced by src/options/options.ts
• config.json → Config is now managed in src/shared/config.ts

You can remove these files after verifying the new build works correctly.