Migrate codebase from JavaScript to TypeScript

Here’s a GitHub issue template for converting the codebase of `servitect` from plain JavaScript to TypeScript:

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**Title**: Migrate codebase from JavaScript to TypeScript

**Description:**
The current codebase of **servitect** is written in vanilla JavaScript. To improve maintainability, scalability, and developer experience, we need to migrate the entire codebase to TypeScript. This will provide benefits like static type checking, better IDE support, and more robust code. However, the dynamic template codes generated should stay in Javascript only. Just upgrade the codebase to typescript.

### Tasks:
1. Set up TypeScript in the project:
- Add `tsconfig.json` with appropriate configuration.
- Update `package.json` to include TypeScript dependencies.
2. Convert existing `.js` files to `.ts` files.
3. Add types for all variables, functions, and modules.
4. Replace `require` imports with `import` syntax where applicable.
5. Refactor any dynamic typing to static typing where possible.
6. Test all features to ensure no functionality is broken after migration.

### Deliverables:
- Fully TypeScript-based codebase.
- Updated documentation or README (if needed) to reflect changes.
- Ensure compatibility with existing users of the npm package.

### Additional Notes:
- Leverage TypeScript definitions for third-party modules wherever available.
- Use TypeScript's strict mode for better code safety.
- Ensure CLI functionality remains unaffected.

Start by reviewing the current JavaScript codebase, package.json, and the proposed tsconfig.json configuration, while identifying the dynamic template code that must remain JavaScript. Check the README and verify the CLI and existing npm package behavior after migration; done means the codebase is TypeScript-based without breaking those compatibility requirements.

Written by the indexing model from the issue text.