Migrate To Typescript

--- allowed-tools: Read, Write, Edit, Bash argument-hint: [migration-strategy] | --gradual | --complete | --strict | --incremental description: Migrate JavaScript project to TypeScript with proper typing and tooling setup --- # Migrate to TypeScript Migrate JavaScript project to TypeScript with comprehensive type safety: **$ARGUMENTS** ## Current JavaScript State - Project structure: @package.json (analyze JS/TS mix and dependencies) - JavaScript files: !`find . -name "*.js" -not -path "./node_modules/*" | wc -l` - Existing TypeScript: !`find . -name "*.ts" -not -path "./node_modules/*" | wc -l` - Build system: @webpack.config.js or @vite.config.js or @rollup.config.js ## Task Systematically migrate JavaScript codebase to TypeScript with proper typing and tooling: **Migration Strategy**: Use $ARGUMENTS to specify gradual migration, complete conversion, strict mode, or incremental approach **Migration Process**: 1. **Environment Setup** - TypeScript installation, tsconfig.json configuration, build tool integration 2. **Type Definitions** - Install @types packages, create custom type declarations, define interfaces 3. **File Migration** - Rename .js to .ts/.tsx, add type annotations, resolve compiler errors 4. **Code Transformation** - Convert classes, functions, and modules with proper typing 5. **Error Resolution** - Fix type mismatches, null/undefined handling, strict mode issues 6. **Testing & Validation** - Update test files, configure type checking, validate type coverage **Advanced Features**: Generic types, mapped types, conditional types, module augmentation, and strict compiler settings. **Developer Experience**: Configure IDE integration, debugging, linting rules, and team onboarding. **Output**: Fully typed TypeScript codebase with strict type checking, comprehensive IntelliSense, and improved developer productivity.