Impact Score: 5/10
Deno v0.4.0 — 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.
⚡ Executive Summary (TL;DR)
Deno v0.4.0. Source highlight: Note: We are moving to a new versioning scheme in which we increment the minor number every week instead of the patch.
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 (6)
- add "deno run" subcommand (#2215)
- add "deno xeval" subcommand (#2260)
- add --no-fetch CLI flag to prevent remote downloads (#2213)
- Add Request global constructor (#2253)
- fs: add Deno.utime/Deno.utimeSync (#2241)
- Add support for custom tsconfig.json (#2089)
🔧 Bug Fixes & Patches (4)
- Fix: deno --v8-options does not print v8 options (#2277)
- Performance improvements and fix memory leaks (#2259, #2238)
- textproto: fix invalid header error and move tests (#369)
- fix ensureLink (#360)
📄 View Raw Release Notes (Original Developer Log)
### Changes
Note: [We are moving to a new versioning scheme in which we increment the minor number every week instead of the patch.](https://github.com/denoland/deno/issues/2288)
In deno:
- add "deno run" subcommand (#2215)
- add "deno xeval" subcommand (#2260)
- add --no-fetch CLI flag to prevent remote downloads (#2213)
- Fix: deno --v8-options does not print v8 options (#2277)
- Performance improvements and fix memory leaks (#2259, #2238)
- Add Request global constructor (#2253)
- fs: add Deno.utime/Deno.utimeSync (#2241)
- Make `atob` follow the spec (#2242)
- Upgrade V8 to 7.6.53 (#2236)
- Remove ? from URL when deleting all params (#2217)
- Add support for custom tsconfig.json (#2089)
- URLSearchParams init with itself (#2218)
In deno_std:
- textproto: fix invalid header error and move tests (#369)
- Add http/cookie improvements (#368, #359)
- fix ensureLink (#360)
### Install / Upgrade
**With Shell:**
```sh
curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.4.0
```
**With PowerShell:**
```powershell
iwr https://deno.land/x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.4.0
```