Announcing Deno 2
deno.com
Our next major version of Deno combines the simplicity, security, and performance of Deno 1 with full Node and npm backwards compatibility, and much more.

Today, we’re thrilled to announce Deno 2, which includes:

  • Backwards compatibility with Node.js and npm, allowing you to run existing Node applications seamlessly
  • Native support for package.json and node_modules
  • Package management with new deno install, deno add, and deno remove commands
  • A stabilized standard library
  • Support for private npm registries
  • Workspaces and monorepo support
  • Long Term Support (LTS) releases
  • JSR: a modern registry for sharing JavaScript libraries across runtimes

We are also continually improving many existing Deno features:

  • deno fmt can now format HTML, CSS, and YAML
  • deno lint now has Node specific rules and quick fixes
  • deno test now supports running tests written using node:test
  • deno task can now run package.json scripts
  • deno doc’s HTML output has improved design and better search
  • deno compile now supports code signing and icons on Windows
  • deno serve can run HTTP servers across multiple cores, in parallel
  • deno init can scaffold now scaffold libraries or servers
  • deno jupyter now supports outputting images, graphs, and HTML
  • deno bench supports critical sections for more precise measurements
  • deno coverage can now output reports in HTML

Deno is a single binary for the TypeScript and JavaScript ecosystems. Deno is secure by default (installing npm libs do not automatically have full system perms/access).

The new standard library stabilizes a vetted collection of safe binaries instead of having to search for and install random libraries for basic or common use cases with [or without] own security assessments.

Deno compile compiles the TS/JS project into a single binary.

The backwards compatibility to npm and npm/js frameworks enables deno usage in existing projects and with existing libs with the benefits of deno and a path to incremental migration.

The announcement video is worth watching. The intro is great.

  • Kissaki@programming.devOPEnglish
    13·
    1 month ago

    I’m not in (or into) the JS ecosystem. I’m glad I didn’t have to dive into that at work yet. But I’ve used deno and bun in the past to evade installing NodeJS.

    Just now I used deno v2 to build a static website I contributed a fix to, and it worked. I’m very glad to see I don’t have to juggle different npm alternatives or be stuck without when I want to contribute but definitely do not want to install NodeJS.

    The deno install was hilariously slow downloading and installing the JS libs into the node_modules folder. 150 MB of JS source code. For a simple static website generator.

    Comparing it to the hugo.exe binary (go, single binary static website generator): That one is 80 MB. Not having to juggle many files makes it a lot faster and compact of course.

    The deno.exe is 107 MB. Which is a chunky size; but man it provides a lot. When you contrast that to the node_modules folder… lol

    The announcement also mentions and links to JSR for TypeScript module publishing platform, also with backwards compatibility and automatic stuff generating. Which also seems like a good effort.