JSR is a new package registry introduced by the Deno team to address issues in the JavaScript ecosystem. It aims to innovate the package registry side, allowing flexibility in version dependencies with semver expressions. JSR supports TypeScript alongside JavaScript, ensuring efficient type checking and automatic document generation. It enforces limitations like dependencies only on JSR packages, npm packages, or Node.js built-ins. The registry features a rich web interface with symbol search, dependency analysis, and version control. While still in early stages, JSR shows promise in enhancing developer productivity and maintaining advantages of “package-management as code,” especially by bringing TypeScript on equal footing with JavaScript.
https://www.kitsonkelly.com/posts/jsr-first-impressions