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Deno v1.3.1stable Released Aug 21, 2020
⚠️ Breaking Change Impact Score: 7/10

Deno v1.3.1 — 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(std/datetime): Remove currentDayOfYear (#7059)
Read the original context ↗
Source flags breaking changes — review applicability
📄 .MD
✨ Features 3 🔧 Bug Fixes 6 ⚠️ Breaking & Deprecations 1
⚡ Executive Summary (TL;DR)

Deno v1.3.1. Source highlight: fix: Allow isolated "%"s when parsing file URLs (#7108)

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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 (1)

  • - BREAKING(std/datetime): Remove currentDayOfYear (#7059)

✨ New Features & Capabilities (3)

  • core: Add missing export of HeapLimits (#7047)
  • feat(std/node): Add basic asserts (#7091)
  • feat(std/datetime): Generalise parser, add formatter (#6619)

🔧 Bug Fixes & Patches (6)

  • fix: Allow isolated "%"s when parsing file URLs (#7108)
  • fix: Blob.arrayBuffer returns Uint8Array (#7086)
  • fix: CLI argument parsing with dash values (#7039)
  • fix: Create Body stream from any valid bodySource (#7128)
  • fix: Granular permission requests/revokes (#7074)
  • fix: Handling of multiple spaces in URLSearchParams (#7068)
📄 View Raw Release Notes (Original Developer Log)
### 1.3.1 / 2020.08.21 - fix: Allow isolated "%"s when parsing file URLs (#7108) - fix: Blob.arrayBuffer returns Uint8Array (#7086) - fix: CLI argument parsing with dash values (#7039) - fix: Create Body stream from any valid bodySource (#7128) - fix: Granular permission requests/revokes (#7074) - fix: Handling of multiple spaces in URLSearchParams (#7068) - core: Enable WebAssembly.instantiateStreaming (#7043) - core: Add missing export of HeapLimits (#7047) - upgrade: swc_ecmascript, deno_lint, dprint (#7098) Changes in std version 0.66.0: - BREAKING(std/datetime): Remove currentDayOfYear (#7059) - feat(std/node): Add basic asserts (#7091) - feat(std/datetime): Generalise parser, add formatter (#6619) - fix(std/node): Misnamed assert exports (#7123) - fix(std/encoding/toml): Stop TOML parser from detecting numbers in strings. (#7064) - fix(std/encoding/csv): Improve error message on ParseError (#7057) ### Install / Upgrade **Using Deno:** ```sh deno upgrade --version 1.3.1 ``` **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v1.3.1 ``` **With PowerShell:** ```powershell $v="1.3.1"; iwr https://deno.land/x/install/install.ps1 -useb | iex ```
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