Deno v1.26.0 — 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 ⚡ Improvements 4 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.26.0. Source highlight: feat: add --allow-sys permission flag (#16028)

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

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📊 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: add --allow-sys permission flag (#16028)
feat: add --no-npm flag to disable npm: imports (#15673)
feat: Add requesting API name to permission prompt (#15936)
feat: allow exiting on two consecutive ctrl+c presses (#15981)
feat: download progress bar (#15814)
feat: implement Web Cache API (#15829)

⚡ Performance & Enhancements (4)

perf: don't re-download package tarball to global cache if local node_modules
perf: use fast ops for tty (#15976)
perf(ext/console): break on iterableLimit & better sparse array handling
perf(ext/fetch): use content-length in InnerBody.consume (#15925)

🔧 Bug Fixes & Patches (6)

fix(cli/bench): strace numeric format (#16055)
fix(cli/vendor): handle assert type json during vendoring (#16059)
fix(ext/console): fix error when logging a proxied Date (#16018)
fix(ext/fetch): blob url (#16057)
fix(ext/flash): reregister socket on partial read on Windows (#16076)
fix(fmt): keep type args in type queries and keep empty array expr element's

📄 View Raw Release Notes (Original Developer Log)

### 1.26.0 / 2022.09.28 - feat: add --allow-sys permission flag (#16028) - feat: add --no-npm flag to disable npm: imports (#15673) - feat: Add requesting API name to permission prompt (#15936) - feat: allow exiting on two consecutive ctrl+c presses (#15981) - feat: download progress bar (#15814) - feat: implement Web Cache API (#15829) - feat: Refresh interactive permission prompt (#15907) - feat: Stabilize Deno.hostname() API (#15932) - feat: Stabilize Deno.refTimer() and Deno.unrefTimer() APIs (#16036) - feat: TypeScript 4.8 update (#16040) - feat(cli): update to TypeScript 4.8 (#15064) - feat(core): add Deno.core.setPromiseHooks (#15475) - feat(ext/crypto): add x25519 and Ed25519 CFRG curves (#14119) - feat(ext/flash): add `reuseport` option on Linux (#16022) - feat(info): add information about npm modules cache (#15750) - feat(lint): add --compact flag for terse output (#15926) - feat(npm): functionality to support child_process.fork (#15891) - feat(ops): Fallible fast ops (#15989) - feat(unstable): Deno.setRaw -> Deno.stdin.setRaw (#15797) - fix(cli/bench): strace numeric format (#16055) - fix(cli/vendor): handle assert type json during vendoring (#16059) - fix(ext/console): fix error when logging a proxied Date (#16018) - fix(ext/fetch): blob url (#16057) - fix(ext/flash): reregister socket on partial read on Windows (#16076) - fix(fmt): keep type args in type queries and keep empty array expr element's trailing comma (#16034) - fix(npm): use ntfs junctions in node_modules folder on Windows (#16061) - fix(require): tryPackage uses optional chaining (#16020) - fix(runtime): refresh perm prompt 3 lines instead of 4 (#16049) - perf: don't re-download package tarball to global cache if local node_modules folder exists for package (#16005) - perf: use fast ops for tty (#15976) - perf(ext/console): break on iterableLimit & better sparse array handling (#15935) - perf(ext/fetch): use content-length in InnerBody.consume (#15925)

← Older Version Deno v1.25.4 Newer Version → Deno v1.26.1