Deno v0.12.0 — 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 2 🔧 Bug Fixes 3

⚡ Executive Summary (TL;DR)

Deno v0.12.0. Source highlight: feat: Support window.onload (#2643)

Visit Deno Official Site ↗ Official Release Source ↗ All Deno Releases 📡 Deno RSS

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 (2)

feat: Support window.onload (#2643)
feat: generate default file name for bundle when URL ends in a slash (#2625)

🔧 Bug Fixes & Patches (3)

fix: for '-' arg after script name (#2631)
fix: upgrade v8 to 7.7.200 (#2624)
fix: emptydir on windows (denoland/deno_std#531)

📄 View Raw Release Notes (Original Developer Log)

### Changes In deno: - feat: Support window.onload (#2643) - feat: generate default file name for bundle when URL ends in a slash (#2625) - fix: for '-' arg after script name (#2631) - fix: upgrade v8 to 7.7.200 (#2624) In deno_std: - Rename catjson.ts to catj.ts (denoland/deno_std#533) - Remove os.userHomeDir in favor of Deno.homeDir (denoland/deno_std#523) - fix: emptydir on windows (denoland/deno_std#531) ### Install / Upgrade **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.12.0 ``` **With PowerShell:** ```powershell iwr https://deno.land/x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.12.0 ```

← Older Version Deno v0.11.0 Newer Version → Deno v0.13.0