Deno v2.0.1 — 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 2 ⚡ Improvements 4 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v2.0.1. Source highlight: feat(lsp): "deno/didRefreshDenoConfigurationTree" notifications (#26215)

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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 (2)

feat(lsp): "deno/didRefreshDenoConfigurationTree" notifications (#26215)
feat(unstable): `--unstable-detect-cjs` for respecting explicit

⚡ Performance & Enhancements (4)

perf(http): avoid clone getting request method and url (#26250)
perf(http): cache webidl.converters lookups in ext/fetch/23_response.js
perf(http): make heap allocation for path conditional (#26289)
perf: use fast calls for microtask ops (#26236)

🔧 Bug Fixes & Patches (6)

fix(add): create deno.json when running `deno add jsr:<pkg>` (#26275)
fix(add): exact version should not have range `^` specifier (#26302)
fix(child_process): map node `--no-warnings` flag to `--quiet` (#26288)
fix(cli): add prefix to install commands in help (#26318)
fix(cli): consolidate pkg parser for install & remove (#26298)
fix(cli): named export takes precedence over default export in doc testing

📄 View Raw Release Notes (Original Developer Log)

### 2.0.1 / 2024.10.16 - feat(lsp): "deno/didRefreshDenoConfigurationTree" notifications (#26215) - feat(unstable): `--unstable-detect-cjs` for respecting explicit `"type": "commonjs"` (#26149) - fix(add): create deno.json when running `deno add jsr:<pkg>` (#26275) - fix(add): exact version should not have range `^` specifier (#26302) - fix(child_process): map node `--no-warnings` flag to `--quiet` (#26288) - fix(cli): add prefix to install commands in help (#26318) - fix(cli): consolidate pkg parser for install & remove (#26298) - fix(cli): named export takes precedence over default export in doc testing (#26112) - fix(cli): improve deno info output for npm packages (#25906) - fix(console/ext/repl): support using parseFloat() (#25900) - fix(ext/console): apply coloring for console.table (#26280) - fix(ext/napi): pass user context to napi_threadsafe_fn finalizers (#26229) - fix(ext/node): allow writing to tty columns (#26201) - fix(ext/node): compute pem length (upper bound) for key exports (#26231) - fix(ext/node): fix dns.lookup result ordering (#26264) - fix(ext/node): handle http2 server ending stream (#26235) - fix(ext/node): implement TCP.setNoDelay (#26263) - fix(ext/node): timingSafeEqual account for AB byteOffset (#26292) - fix(ext/node): use primordials in `ext/node/polyfills/internal/buffer.mjs` (#24993) - fix(ext/webgpu): allow GL backend on Windows (#26206) - fix(install): duplicate dependencies in `package.json` (#26128) - fix(install): handle pkg with dep on self when pkg part of peer dep resolution (#26277) - fix(install): retry downloads of registry info / tarballs (#26278) - fix(install): support installing npm package with alias (#26246) - fix(jupyter): copy kernels icons to the kernel directory (#26084) - fix(jupyter): keep running event loop when waiting for messages (#26049) - fix(lsp): relative completions for bare import-mapped specifiers (#26137) - fix(node): make `process.stdout.isTTY` writable (#26130) - fix(node/util): export `styleText` from `node:util` (#26194) - fix(npm): support `--allow-scripts` on `deno run` (and `deno add`, `deno test`, etc) (#26075) - fix(repl): importing json files (#26053) - fix(repl): remove check flags (#26140) - fix(unstable/worker): ensure import permissions are passed (#26101) - fix: add hint for missing `document` global in terminal error (#26218) - fix: do not panic on wsl share file paths on windows (#26081) - fix: do not panic running remote cjs module (#26259) - fix: do not panic when using methods on classes and interfaces in deno doc html output (#26100) - fix: improve suggestions and hints when using CommonJS modules (#26287) - fix: node-api function call should use preamble (#26297) - fix: panic in `prepare_stack_trace_callback` when global interceptor throws (#26241) - fix: use syntect for deno doc html generation (#26322) - perf(http): avoid clone getting request method and url (#26250) - perf(http): cache webidl.converters lookups in ext/fetch/23_response.js (#26256) - perf(http): make heap allocation for path conditional (#26289) - perf: use fast calls for microtask ops (#26236)

← Older Version Deno v2.0.0 Newer Version → Deno v2.0.2