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Deno v1.14.2stable Released Sep 28, 2021
Impact Score: 5/10

Deno v1.14.2 — 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 1 ⚡ Improvements 6 🔧 Bug Fixes 6
⚡ Executive Summary (TL;DR)

Deno v1.14.2. Source highlight: feat(cli/fmt): support more markdown extensions (#12195)

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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 (1)

  • feat(cli/fmt): support more markdown extensions (#12195)

⚡ Performance & Enhancements (6)

  • perf(ext/fetch): Use the WebIDL conversion to DOMString rather than USVString
  • perf(ext/fetch): skip USVString webidl conv on string constructor (#12168)
  • perf(fetch): optimize InnerBody constructor (#12232)
  • perf(fetch): optimize newInnerRequest blob url check (#12245)
  • perf(fetch/Response): avoid class fields (#12237)
  • perf(fetch/headers): optimize appendHeader (#12234)

🔧 Bug Fixes & Patches (6)

  • fix(cli/permissions): ensure revoked permissions are no longer granted
  • fix(ext/http): fortify "is websocket?" check (#12179)
  • fix(ext/http): include port number in h2 urls (#12181)
  • fix(ext/web): FileReader error messages (#12218)
  • fix(ext/webidl): correctly apply [SymbolToStringTag] to interfaces (#11851)
  • fix(http): panic when responding to a closed conn (#12216)
📄 View Raw Release Notes (Original Developer Log)
### 1.14.2 / 2021.09.28 - feat(cli/fmt): support more markdown extensions (#12195) - fix(cli/permissions): ensure revoked permissions are no longer granted (#12159) - fix(ext/http): fortify "is websocket?" check (#12179) - fix(ext/http): include port number in h2 urls (#12181) - fix(ext/web): FileReader error messages (#12218) - fix(ext/webidl): correctly apply [SymbolToStringTag] to interfaces (#11851) - fix(http): panic when responding to a closed conn (#12216) - fix(workers): Don't panic when a worker's parent thread stops running (#12156) - fix: subprocess kill support on windows (#12134) - perf(ext/fetch): Use the WebIDL conversion to DOMString rather than USVString for Response constructor (#12201) - perf(ext/fetch): skip USVString webidl conv on string constructor (#12168) - perf(fetch): optimize InnerBody constructor (#12232) - perf(fetch): optimize newInnerRequest blob url check (#12245) - perf(fetch/Response): avoid class fields (#12237) - perf(fetch/headers): optimize appendHeader (#12234) - perf(ops): optimize permission check (#11800) - perf(web): optimize Event constructor (#12231) - perf(webidl/ByteString): 3x faster ASCII check (#12230) - quickfix(ci): only run "Build product size info" on main/tag (#12184) - upgrade serde_v8 and rusty_v8 (#12175)
← Older Version Deno v1.14.1