Deno v1.27.1 — 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.

Compatibility not verified — check source notes

📄 .MD

✨ Features 5 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.27.1. Source highlight: feat(core): support creating snapshots from existing snapshots (#14744)

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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(core): support creating snapshots from existing snapshots (#14744)
feat(unstable): support npm specifiers in `deno info` for display text output only (#16470)
feat(unstable/lock): autodiscovery of lockfile (#16498)
feat(unstable/lock): require --unstable flag to auto discover lockfile (#16524)
feat(unstable/npm): `deno info --json` support for npm specifiers (#16472)

🔧 Bug Fixes & Patches (6)

fix: change default locale value (#16463)
fix: finish stabilizing Deno.osRelease() (#16447)
fix: update env to sys permission in jsdoc for Deno.osRelease (#16483)
fix(cli/dts): add typings for Change Array by copy proposal (#16499)
fix(core): fix APIs not to be affected by `Promise.prototype.then` modification (#16326)
fix(ext/crypto): fix HMAC jwk import "use" check (#16465)

📄 View Raw Release Notes (Original Developer Log)

### 1.27.1 / 2022.11.03 - feat(core): support creating snapshots from existing snapshots (#14744) - feat(unstable): support npm specifiers in `deno info` for display text output only (#16470) - feat(unstable/lock): autodiscovery of lockfile (#16498) - feat(unstable/lock): require --unstable flag to auto discover lockfile (#16524) - feat(unstable/npm): `deno info --json` support for npm specifiers (#16472) - fix: change default locale value (#16463) - fix: finish stabilizing Deno.osRelease() (#16447) - fix: update env to sys permission in jsdoc for Deno.osRelease (#16483) - fix(cli/dts): add typings for Change Array by copy proposal (#16499) - fix(core): fix APIs not to be affected by `Promise.prototype.then` modification (#16326) - fix(ext/crypto): fix HMAC jwk import "use" check (#16465) - fix(ext/websocket): make try_send ops infallible (#16454) - fix(lock): add --no-lock flag to disable auto discovery of lock file (#16526) - fix(lock): Additive lock file (#16500) - fix(lock): error if a referenced package id doesn't exist in list of packages (#16509) - fix(lsp): add ServerCapabilities::encoding (#16444) - fix(lsp): correct `parameterNames.suppressWhenArgumentMatchesName` and `variableTypes.suppressWhenTypeMatchesName` (#16469) - fix(napi): fix is_detached_arraybuffer (#16478) - fix(npm): add `console` global for node environment (#16519) - fix(runtime): fix Deno.hostname on windows (#16530) - fix(test): add slice method to filename to make them portable (#16482) - fix(tools): show correct upgrade command for upgrading canary (#16486) - fix(upgrade): don't prompt if latest version is older than current binary (#16464)

← Older Version Deno v1.27.0 Newer Version → Deno v1.27.2