[cdoremus]

Here's what they have to say on the JSR site:

Why Choose JSR? A True TypeScript-First Environment: Efficient type checking and no transpilation hassles—write in TypeScript and deploy directly.

Performance and Usability at the Forefront: With integrated workspaces and seamless NPM integration, JSR puts usability first.

Secured and Accessible Modules: All modules in JSR are exposed over HTTPS, ensuring your code is always secure.

Open Source, Community-Driven: Built by developers, for developers, JSR is shaped by the real-world needs and contributions of the JavaScript community.