Deno v1.25.4 — 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 3 ⚡ Improvements 6 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.25.4. Source highlight: feat(unstable/npm): add flag for creating and resolving npm packages to a

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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 (3)

feat(unstable/npm): add flag for creating and resolving npm packages to a
feat(unstable/npm): add support for --reload=npm: and --reload=npm:<package>
feat(internal/ops): Automatic fast ops creation (#15527)

⚡ Performance & Enhancements (6)

perf(cli): avoid `canonicalize_path` if config file does not exist (#15957)
perf(cli): avoid `clap::App::clone` (#15951)
perf(cli): use -O3 instead of -Oz (#15952)
perf(core): use single ObjectTemplate for ops in `initialize_ops` (#15959)
perf(ext/console): avoid `wrapConsole` when not inspecting (#15931)
perf(web): optimize encodeInto() (#15922)

🔧 Bug Fixes & Patches (6)

fix(compile): keep non-exe extension in output name on Windows (#15994)
fix(doc): deno doc should parse modules if they haven't been parsed before
fix(ext/node): fix builtin module module (#15904)
fix(ext/webgpu): make GPUDevice.features SetLike (#15853)
fix(flash): panic if response if undefined (#15964)
fix(runtime): better error message with Deno.env.get/set (#15966)

📄 View Raw Release Notes (Original Developer Log)

### 1.25.4 / 2022.09.22 - feat(unstable/npm): add flag for creating and resolving npm packages to a local node_modules folder (#15971) - feat(unstable/npm): add support for --reload=npm: and --reload=npm:<package> (#15972) - feat(internal/ops): Automatic fast ops creation (#15527) - fix(compile): keep non-exe extension in output name on Windows (#15994) - fix(doc): deno doc should parse modules if they haven't been parsed before (#15941) - fix(ext/node): fix builtin module module (#15904) - fix(ext/webgpu): make GPUDevice.features SetLike (#15853) - fix(flash): panic if response if undefined (#15964) - fix(runtime): better error message with Deno.env.get/set (#15966) - fix(runtime): fix permission status cache keys (#15899) - perf(cli): avoid `canonicalize_path` if config file does not exist (#15957) - perf(cli): avoid `clap::App::clone` (#15951) - perf(cli): use -O3 instead of -Oz (#15952) - perf(core): use single ObjectTemplate for ops in `initialize_ops` (#15959) - perf(ext/console): avoid `wrapConsole` when not inspecting (#15931) - perf(web): optimize encodeInto() (#15922) - perf: fs optimizations - part 1 (#15873)

← Older Version Deno v1.25.3 Newer Version → Deno v1.26.0