# TypeScript Migration Status

## ✅ Completed (PR #602)

- Enhanced `package/index.d.ts` with comprehensive type definitions
- Added TypeScript type packages for better IDE support
- Improved Config and DevServerConfig interfaces
- Added missing properties (private_output_path, inline_css, env_prefix, etc.)
- All tests passing
- Zero JavaScript modifications (no whitespace changes)
- Full backward compatibility maintained

## 📋 Next Steps (Issue #605)

### Phase 2: Core Module Conversion

- [ ] Convert `package/config.js` to TypeScript
- [ ] Convert `package/env.js` to TypeScript
- [ ] Convert `package/index.js` to TypeScript
- [ ] Convert `package/utils/helpers.js` to TypeScript

### Phase 3: Environment & Build System

- [ ] Convert environment files (base, development, production, test)
- [ ] Convert dev_server.js
- [ ] Convert webpackDevServerConfig.js

### Phase 4: Rules & Loaders (PR #620) ✅

- [x] Convert all files in `package/rules/`
- [x] Convert all files in `package/plugins/`
- [x] Convert all files in `package/optimization/`

### Phase 5: Framework-Specific Modules ✅

- [x] Convert rspack support files
- [x] Convert swc support files
- [x] Convert esbuild support files
- [x] Convert babel preset

### Phase 6: Final Cleanup ✅

- [x] Add TypeScript linting with @typescript-eslint
- [x] Verify strict mode is enabled (already configured)
- [x] Update documentation

## Why Gradual Migration?

- **Lower risk**: Each phase can be tested independently
- **Team learning**: Get familiar with TypeScript incrementally
- **Immediate value**: Type definitions already provide IDE benefits
- **No breaking changes**: Users unaffected during migration

## Related Links

- Original issue: #200
- Initial PR: #602
- Next steps issue: #605