Deno v1.0.3 — 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 5 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.0.3. Source highlight: fix: Add unstable checks for Deno.dir and Diagnostics (#5750)

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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 (5)

feat(std/encoding): Add base64 (#5811)
feat(std/http): Handle .wasm files in file_server (#5896)
feat(std/node): Add link/linkSync polyfill (#5930)
feat(std/node): fs.writeFile/sync path can now be an URL (#5652)
feat(std/testing): Return results in benchmark promise (#5842)

🔧 Bug Fixes & Patches (6)

fix: Add unstable checks for Deno.dir and Diagnostics (#5750)
fix: Add unstable checks for unix transport (#5818)
fix: Create HTTP cache lazily (#5795)
fix: Dependency analysis in TS compiler (#5817, #5785, #5870)
fix: Expose Error.captureStackTrace (#5254)
fix: Improved typechecking error for unstable props (#5503)

📄 View Raw Release Notes (Original Developer Log)

### Changes Changes in the CLI: - fix: Add unstable checks for Deno.dir and Diagnostics (#5750) - fix: Add unstable checks for unix transport (#5818) - fix: Create HTTP cache lazily (#5795) - fix: Dependency analysis in TS compiler (#5817, #5785, #5870) - fix: Expose Error.captureStackTrace (#5254) - fix: Improved typechecking error for unstable props (#5503) - fix: REPL evaluates in strict mode (#5565) - fix: Write lock file before running any code (#5794) - fix(debugger): BorrowMutError when evaluating expression in inspector console (#5822) - fix(doc): Handle comments at the top of the file (#5891) - fix(fmt): Handle formatting UTF-8 w/ BOM files (#5881) - fix(permissions): Fix CWD and exec path leaks (#5642) - fix(web/blob): DenoBlob name (#5879) - fix(web/console): Hide `values` for console.table if display not necessary (#5914) - fix(web/console): Improve indentation when displaying objects with console.log (#5909) - fix(web/encoding): atob should throw dom exception (#5730) - fix(web/fetch): Make Response constructor standard (#5787) - fix(web/fetch): Allow ArrayBuffer as Fetch request body (#5831) - fix(web/formData): Set default filename for Blob to <blob> (#5907) - upgrade: dprint to 0.19.0 (#5899) Changes in std version 0.54.0: - feat(std/encoding): Add base64 (#5811) - feat(std/http): Handle .wasm files in file_server (#5896) - feat(std/node): Add link/linkSync polyfill (#5930) - feat(std/node): fs.writeFile/sync path can now be an URL (#5652) - feat(std/testing): Return results in benchmark promise (#5842) - fix(std/http): readTrailer evaluates header names by case-insensitive (#4902) - fix(std/log): Improve the calculation of byte length (#5819) - fix(std/log): Fix FileHandler test with mode 'x' on non-English systems (#5757) - fix(std/log): Use writeAllSync instead of writeSync (#5868) - fix(std/testing/asserts): Support browsers (#5847) ### Install / Upgrade **Using Deno:** ```sh deno upgrade --version 1.0.3 ``` **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v1.0.3 ``` **With PowerShell:** ```powershell $v="1.0.3"; iwr https://deno.land/x/install/install.ps1 -useb | iex ```

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