Deno v0.33.0 — 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 6 ⚡ Improvements 1 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v0.33.0. Source highlight: feat(std/http): support trailer headers (#3938, #3989)

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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 (6)

feat(std/http): support trailer headers (#3938, #3989)
feat(std/node): Add readlink, readlinkSync (#3926)
feat(std/node): Event emitter node polyfill (#3944, #3959, #3960)
feat(deno install): add --force flag and remove yes/no prompt (#3917)
feat: Improve support for diagnostics from runtime compiler APIs (#3911)
feat: `deno fmt -` formats stdin and print to stdout (#3920)

⚡ Performance & Enhancements (1)

refactor: Improve `deno bundle` by using System instead of AMD (#3965)

🔧 Bug Fixes & Patches (6)

fix(std/http): align serve and serveTLS APIs (#3881)
fix(std/http/file_server): don't crash on "%" pathname (#3953)
fix(std/path): Use non-capturing groups in globrex() (#3898)
fix(deno types): don't panic when piped to head (#3910)
fix(deno fmt): support top-level await (#3952)
fix: Correctly determine a --cached-only error (#3979)

📄 View Raw Release Notes (Original Developer Log)

### Changes - feat(std/http): support trailer headers (#3938, #3989) - feat(std/node): Add readlink, readlinkSync (#3926) - feat(std/node): Event emitter node polyfill (#3944, #3959, #3960) - feat(deno install): add --force flag and remove yes/no prompt (#3917) - feat: Improve support for diagnostics from runtime compiler APIs (#3911) - feat: `deno fmt -` formats stdin and print to stdout (#3920) - feat: add std/signal (#3913) - feat: make testing API built-in Deno.test() (#3865, #3930, #3973) - fix(std/http): align serve and serveTLS APIs (#3881) - fix(std/http/file_server): don't crash on "%" pathname (#3953) - fix(std/path): Use non-capturing groups in globrex() (#3898) - fix(deno types): don't panic when piped to head (#3910) - fix(deno fmt): support top-level await (#3952) - fix: Correctly determine a --cached-only error (#3979) - fix: No longer require aligned buffer for shared queue (#3935) - fix: Prevent providing --allow-env flag twice (#3906) - fix: Remove unnecessary EOF check in Deno.toAsyncIterable (#3914) - fix: WASM imports loaded HTTP (#3856) - fix: better WebWorker API compatibility (#3828 ) - fix: deno fmt improvements (#3988) - fix: make WebSocket.send() exclusive (#3885) - refactor: Improve `deno bundle` by using System instead of AMD (#3965) - refactor: Remove conditionals from installer (#3909) - refactor: peg workers to a single thread (#3844, #3968, #3931, #3903, #3912, #3907, #3904) ### Install / Upgrade **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.33.0 ``` **With PowerShell:** ```powershell iwr https://deno.land/x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.33.0 ```

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