Deno v1.9.0 — 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 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.9.0. Source highlight: feat: blob URL support (#10045)

Visit Deno Official Site ↗ Official Release Source ↗ All Deno Releases 📡 Deno RSS

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: blob URL support (#10045)
feat: blob URL support in fetch (#10120)
feat: data URL support in fetch (#10054)
feat: native HTTP bindings (#9935)
feat: raise file descriptor limit on startup (#10162)
feat: set useDefineForClassFields to true (#10119)

🔧 Bug Fixes & Patches (6)

fix: include deno.crypto in "deno types" (#9863)
fix: Properly await already evaluating dynamic imports (#9984)
fix(lsp): don't error on tsc debug failures for code actions (#10047)
fix(lsp): ensure insert_text is passed back on completions (#9951)
fix(lsp): folding range adjustment panic (#10030)
fix(lsp): normalize windows file URLs properly (#10034)

📄 View Raw Release Notes (Original Developer Log)

### 1.9.0 / 2021.04.13 - feat: blob URL support (#10045) - feat: blob URL support in fetch (#10120) - feat: data URL support in fetch (#10054) - feat: native HTTP bindings (#9935) - feat: raise file descriptor limit on startup (#10162) - feat: set useDefineForClassFields to true (#10119) - feat: stabilize Deno.ftruncate and Deno.ftruncateSync (#10126) - feat: stricter typings for Listener & Conn (#10012) - feat(lsp): add import completions (#9821) - feat(lsp): add registry import auto-complete (#9934) - feat(lsp): implement textDocument/foldingRange (#9900) - feat(lsp): implement textDocument/selectionRange (#9845) - feat(permissions): allow env permission to take values (#9825) - feat(permissions): allow run permission to take values (#9833) - feat(runtime): add stat and statSync methods to Deno.File (#10107) - feat(runtime): add truncate and truncateSync methods to Deno.File (#10130) - feat(runtime): stabilize Deno.fstat and Deno.fstatSync (#10108) - feat(runtime/permissions): prompt fallback (#9376) - feat(unstable): Add Deno.memoryUsage() (#9986) - feat(unstable): ALPN config in listenTls (#10065) - fix: include deno.crypto in "deno types" (#9863) - fix: Properly await already evaluating dynamic imports (#9984) - fix(lsp): don't error on tsc debug failures for code actions (#10047) - fix(lsp): ensure insert_text is passed back on completions (#9951) - fix(lsp): folding range adjustment panic (#10030) - fix(lsp): normalize windows file URLs properly (#10034) - fix(lsp): properly handle encoding URLs from lsp client (#10033) - fix(op_crates/console): console.table value misalignment with varying keys (#10127) - fix(permissions): don't panic when no input is given (#9894) - fix(runtime/js/timers): Use (0, eval) instead of eval() (#10103) - fix(runtime/readFile): close resources on error during read (#10059) - fix(websocket): ignore resource close error (#9755) Release notes for std version 0.93.0: https://github.com/denoland/deno_std/releases/tag/0.93.0

← Older Version Deno v1.8.3 Newer Version → Deno v1.9.1