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Deno v0.41.0stable Released Apr 16, 2020
⚠️ Breaking Change Impact Score: 7/10

Deno v0.41.0 — 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.

Breaking-change evidence from the source

  • - BREAKING: Improve readdir() and FileInfo interfaces (#4763)
  • - BREAKING: Remove depracated APIs for mkdir and mkdirSync (#4615)
  • - BREAKING: Make fetch API more web compatible (#4687)
  • - BREAKING: Remove std/testing/format.ts (#4749)
  • - BREAKING: Migrate std/types to deno.land/x/types/ (#4713, #4771)
Read the original context ↗
Source flags breaking changes — review applicability
📄 .MD
✨ Features 6 ⚡ Improvements 1 🔧 Bug Fixes 6 ⚠️ Breaking & Deprecations 5
⚡ Executive Summary (TL;DR)

Deno v0.41.0. Source highlight: BREAKING: Improve readdir() and FileInfo interfaces (#4763)

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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.

⚠️ Breaking Changes & Deprecations (5)

  • - BREAKING: Improve readdir() and FileInfo interfaces (#4763)
  • - BREAKING: Remove depracated APIs for mkdir and mkdirSync (#4615)
  • - BREAKING: Make fetch API more web compatible (#4687)
  • - BREAKING: Remove std/testing/format.ts (#4749)
  • - BREAKING: Migrate std/types to deno.land/x/types/ (#4713, #4771)

✨ New Features & Capabilities (6)

  • feat(doc): support for runtime built-ins (#4635)
  • feat(std/log): rotating handler, docs improvements (#4674)
  • feat(std/node): Add isPrimitive method (#4673)
  • feat(std/node/fs): Add copyFile and copyFileSync methods (#4726)
  • feat(std/signal): Add onSignal method (#4696)
  • feat(std/testing): Change output of diff (#4697)

⚡ Performance & Enhancements (1)

  • BREAKING: Improve readdir() and FileInfo interfaces (#4763)

🔧 Bug Fixes & Patches (6)

  • fix(install): Clean up output on Windows (#4764)
  • fix(core): Handle SyntaxError during script compilation (#4770)
  • fix(cli): Async stack traces and stack formatting (#4690, #4706, #4715)
  • fix(cli): Remove unnecessary namespaces in "deno types" (#4683, #4698, #4718,
  • fix(cli): Panic on invalid UTF-8 string (#4704)
  • fix(cli/js/net): Make generator return types iterable (#4661)
📄 View Raw Release Notes (Original Developer Log)
### Changes - BREAKING: Improve readdir() and FileInfo interfaces (#4763) - BREAKING: Remove depracated APIs for mkdir and mkdirSync (#4615) - BREAKING: Make fetch API more web compatible (#4687) - BREAKING: Remove std/testing/format.ts (#4749) - BREAKING: Migrate std/types to deno.land/x/types/ (#4713, #4771) - feat(doc): support for runtime built-ins (#4635) - feat(std/log): rotating handler, docs improvements (#4674) - feat(std/node): Add isPrimitive method (#4673) - feat(std/node/fs): Add copyFile and copyFileSync methods (#4726) - feat(std/signal): Add onSignal method (#4696) - feat(std/testing): Change output of diff (#4697) - feat(std/http): Verify cookie name (#4685) - feat(std/multipart): Make readForm() type safe (#4710) - feat(std/uuid): Add UUID v1 (#4758) - feat(install): Honor log level arg (#4714) - feat(workers): Make Worker API more web compatible (#4684, #4734, #4391, #4737, #4746) - feat: Add AbortController and AbortSignal API (#4757) - fix(install): Clean up output on Windows (#4764) - fix(core): Handle SyntaxError during script compilation (#4770) - fix(cli): Async stack traces and stack formatting (#4690, #4706, #4715) - fix(cli): Remove unnecessary namespaces in "deno types" (#4683, #4698, #4718, #4719, #4736, #4741) - fix(cli): Panic on invalid UTF-8 string (#4704) - fix(cli/js/net): Make generator return types iterable (#4661) - fix(doc): Handle optional and extends fields (#4738, #4739) - refactor: Event and EventTarget implementation (#4707) - refactor: Use synchronous syscalls where applicable (#4762) - refactor: Remove calls to futures::executor::block_on (#4760, #4775) - upgrade: Rust crates (#4742) ### Install / Upgrade **Using Deno:** ```sh deno upgrade ``` **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v0.41.0 ``` **With PowerShell:** ```powershell iwr https://deno.land/x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.41.0 ```
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