Desktop app packaging becomes a first-class CLI feature
Deno desktop broadened rapidly this week: it landed as a new app-builder command, gained .deb and .rpm outputs for Linux, and added Windows .msi installers. The packaging flow now covers macOS, Linux, and Windows with Rust-based authoring and CI/runtime support, making Deno a more complete desktop distribution story.
The test runner and Node test polyfill get much more capable
deno test picked up retries, repeats, sharding, and built-in snapshot testing with --update-snapshots, giving teams better tools for flaky or large suites. On the Node side, node:test now handles unhandled rejections, timeouts, hook ordering, and mock.module(), closing several compatibility gaps with newer Node behavior.
CLI and task workflows move closer to npm parity
deno task gained --if-present, --jobs/--concurrency, and fuller npm lifecycle/process env vars, while deno run/package.json scripts now behave more like npm scripts. Local package workflows also improved with deno link/unlink, bare-specifier resolution for linked packages, and better hints when workspace or linked imports are misspelled.
Performance and startup work land across runtime and tooling
This week brought meaningful startup wins, including a faster deno run hot path, lazy-loading refinements that cut measured startup time, and residual code caching for Node bootstrap modules. macOS binaries also switched to chained fixups for faster launch, and deno upgrade now streams zstd delta patches to reduce memory spikes.
Networking, permissions, and runtime correctness tighten up
Connection setup now uses Happy Eyeballs for faster dual-stack dialing, deno serve exits cleanly on signals, and several permission checks were made more accurate for network and proxy requests. Other notable fixes include safer socket shutdown, better HTTP/2 behavior, preserved async context in Node callbacks, and a stable --unsafe-proto escape hatch for prototype access.
Node/npm compatibility keeps filling in edge cases
Compatibility improvements touched node:http, node:net, node:child_process, util.styleText, AsyncLocalStorage, Node-API v10, and package/bin resolution. Deno also now warns on engines mismatches during install, seeds deno.lock from npm/pnpm/bun lockfiles, and symlinks workspace npm members into root node_modules correctly.
Other misc changes
Deno.watchFsgained anignoreoption and Jupyter now surfaces cell errors- Coverage can enforce minimum thresholds and merges URL variants correctly
- Desktop/runtime unpacking, snapshotting, and install/update edge cases were fixed
- Internal CLI parsing was split toward a new parser crate, laying groundwork for replacing clap