fix: use typescript

[UziTech]

This requires some changes to marked types to make Parser and Renderer outputs generic.

markedjs/marked#3722 should fix it

[gemini-code-assist]

Summary of Changes

Hello @UziTech, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refactors the project's build system and codebase by migrating to TypeScript. The primary goal is to enhance maintainability, improve developer experience through type safety, and modernize the bundling process with esbuild. This change also ensures that type declarations are automatically generated for seamless integration into other TypeScript projects.

Highlights

• TypeScript Migration: The project has been migrated from JavaScript to TypeScript, with all source files (.js) converted to .ts and a new tsconfig.json added to define the TypeScript compilation settings.
• Build Tooling Change: The build process has transitioned from rollup to esbuild for faster bundling. A new esbuild.config.js file now handles the creation of ESM and UMD bundles.
• Type Declaration Generation: Introduced dts-bundle-generator to automatically generate a single lib/index.d.ts declaration file, ensuring proper type definitions are available for consumers of the library.
• Dependency Updates: Updated package.json and package-lock.json to reflect the new build dependencies (esbuild, dts-bundle-generator, esbuild-plugin-umd-wrapper) and removed the old rollup and globals dependencies.
• Codebase Refinements: Added explicit type annotations, type assertions (as HTMLElement, as unknown as MarkedParser), and non-null assertions (tokens!, renderer!) across the src files to leverage TypeScript's type safety and improve code clarity.

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[gemini-code-assist]

Code Review

This pull request successfully migrates the project to TypeScript, significantly enhancing code quality, maintainability, and developer experience. The changes involve updating the build system from Rollup to esbuild, configuring TypeScript compilation, and refactoring the source code with comprehensive type annotations and assertions. Several improvements to parsing logic, HTML rendering robustness, and type safety have been introduced, making the codebase more reliable.