Deno v0.18.0 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: deno · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes

📄 .MD

✨ Features 4 ⚡ Improvements 1 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v0.18.0. Source highlight: build: remove tools/build.py; cargo build is the build frontend now (#2865, #2874, #2876)

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

✨ New Features & Capabilities (4)

feat: Make integration tests rust unit tests (#2884)
feat: Set user agent for http client (#2916)
feat: add bindings to run microtasks from Isolate (#2793)
feat: Add xeval (denoland/deno_std#581)

⚡ Performance & Enhancements (1)

perf: Improve prettier speed by adding d.ts files (denoland/deno_std#591)

🔧 Bug Fixes & Patches (6)

fix(fetch): implement bodyUsed (#2877)
fix(url): basing in constructor (#2867, #2921)
fix(xeval): incorrect chunk matching behavior (#2857)
fix: Default 'this' to window in EventTarget (#2918)
fix: Expose the DOM Body interface globally (#2903)
fix: Keep all deno_std URLs in sync (#2930)

📄 View Raw Release Notes (Original Developer Log)

### Changes In deno: - build: remove tools/build.py; cargo build is the build frontend now (#2865, #2874, #2876) - feat: Make integration tests rust unit tests (#2884) - feat: Set user agent for http client (#2916) - feat: add bindings to run microtasks from Isolate (#2793) - fix(fetch): implement bodyUsed (#2877) - fix(url): basing in constructor (#2867, #2921) - fix(xeval): incorrect chunk matching behavior (#2857) - fix: Default 'this' to window in EventTarget (#2918) - fix: Expose the DOM Body interface globally (#2903) - fix: Keep all deno_std URLs in sync (#2930) - fix: make 'deno fmt' faster (#2928) - fix: panic during block_on (#2905) - fix: panic during fetch (#2925) - fix: path normalization in resolve_from_cwd() (#2875) - fix: remove deprecated Deno.platform (#2895) - fix: replace bad rid panics with errors (#2870) - fix: type directives import (#2910) - upgrade: V8 7.9.8 (#2907) - upgrade: rust crates (#2937) In deno_std: - feat: Add xeval (denoland/deno_std#581) - fix(flags): Parse builtin properties (denoland/deno_std#579) - fix(uuid): Make it v4 rfc4122 compliant (denoland/deno_std#580) - perf: Improve prettier speed by adding d.ts files (denoland/deno_std#591) - upgrade: prettier to 1.18.2 (denoland/deno_std#592) ### Install / Upgrade **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.18.0 ``` **With PowerShell:** ```powershell iwr https://deno.land/x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.18.0 ```

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