migrate from commonJS to ESM

This is required for ecosystem alignment: ESM is the JavaScript standard. Many new packages are ESM-only, and modern tools (Vite, Next.js 13+) are optimized for ESM with better performance.

this as benefit for maintenance: Cleaner import/export syntax, top-level await support, and superior IDE tooling. Modern frameworks default to ESM and better compatibility with the evolving ecosystem.

And this is a requirement for Deno support