Deno 2.9

5 hours ago

Deno 2.9 introduces deno desktop, a tool for building native desktop applications from web stack projects without Electron boilerplate, producing a single binary.
It enhances migration from Node.js by reading npm, pnpm, yarn, and Bun lockfiles directly, making switching package managers straightforward.
Performance improvements include faster startup times, reduced memory usage under load, and increased HTTP throughput for Deno.serve.
New features include CSS module imports via import attributes, support for snapshot testing, change-aware test selection, and coverage thresholds.
Dependency management enhancements: deno link/unlink for local packages, deno list for viewing dependencies, and preferPackageJson setting.
Supply chain security is bolstered with default minimum dependency age (24 hours) and opt-in no-downgrade trust policy to prevent malicious package versions.
Node.js compatibility advances to Node.js 26, with bare Node builtins resolving without configuration and improvements to node:test and other APIs.
Web Cryptography API expands with post-quantum algorithms (ML-KEM, ML-DSA, SLH-DSA), SHA-3, and other modern cryptographic methods.
Deno.serve now disables automatic compression by default (opt-in) and deprecates legacy abort behavior.
OpenTelemetry integration adds support for configurable sampling and span limits via environment variables.
Miscellaneous updates: Web Locks API, navigator.userAgentData, Happy Eyeballs for connections, deno watch alias, and more.

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