Deno v2.8.1 — 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 1 ⚡ Improvements 1 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v2.8.1. Source highlight: Revert "fix(ext/node): polyfill module.enableCompileCache and companions"

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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 (1)

feat(bundle): support `browser` field map in package.json (#34407)

⚡ Performance & Enhancements (1)

perf(ext/node): reuse keep-alive timer in node:http server (#34302)

🔧 Bug Fixes & Patches (6)

Revert "fix(ext/node): polyfill module.enableCompileCache and companions"
fix(bundle): read package.json sideEffects field (#34406)
fix(cli): clearer error when importing .node addon via ESM (#34361)
fix(config): don't panic when --config path can't be converted to URL (#34351)
fix(core): allow host objects to round-trip through core.deserialize (#34380)
fix(core): keep lazy_loaded_esm sources across concurrent loads (#34353)

📄 View Raw Release Notes (Original Developer Log)

### 2.8.1 / 2026.05.27 - Revert "fix(ext/node): polyfill module.enableCompileCache and companions" (#34190) (#34348) - feat(bundle): support `browser` field map in package.json (#34407) - fix(bundle): read package.json sideEffects field (#34406) - fix(cli): clearer error when importing .node addon via ESM (#34361) - fix(config): don't panic when --config path can't be converted to URL (#34351) - fix(core): allow host objects to round-trip through core.deserialize (#34380) - fix(core): keep lazy_loaded_esm sources across concurrent loads (#34353) - fix(ext/fetch,ext/websocket): check resolved IPs against net deny list (#34236) - fix(ext/node): TLSSocket.authorized=false when client presents no cert (#34381) - fix(ext/node): accept array forms of cert/key/pfx in createSecureContext (#34379) - fix(ext/node): add missing node:util APIs getSystemErrorMap, transferableAbortSignal, transferableAbortController (#34372) - fix(ext/node): allow omitting arguments in base64Slice (#34318) - fix(ext/node): attach register as static on Module (#34305) - fix(ext/node): do not throw NotFound for fs.exists (#34244) - fix(ext/node): drop extra positional args in promisified fs.promises.* (#34347) - fix(ext/node): emit 'error' event for fs.watch open failures (#34398) - fix(ext/node): enforce minimum Miller-Rabin rounds in checkPrime (#34391) - fix(ext/node): extract cert/key from pfx in tls SecureContext (#34383) - fix(ext/node): prevent panic on `node:sqlite` aggregate method (#34385) - fix(ext/node): require env permission for process.loadEnvFile (#34350) - fix(ext/node): reset req.reusedSocket on transparent retry (#34376) - fix(ext/node): support PKCS#12 MACs other than SHA-1 (#34342) - fix(ext/node): tolerate non-AsyncWrap handles in _getNewAsyncId (#34413) - fix(http): wake runtime after direct serve dispatch (#34387) - fix(inspector): emit NodeWorker.attachedToWorker for late workers (#34377) - fix(node/util): don't invoke Proxy traps in util.inspect (#34373) - fix(pack): remove automatic @deno/shim-deno injection (#34411) - fix(runtime): lazy-loaded globals should shadow on inherited [[Set]] (#34405) - fix(task): walk ancestor node_modules/.bin in BYONM mode (#34364) - fix(transpile): preserve newlines after multi-line block comments (#34357) - fix(types): restore brotli in CompressionFormat for dom/webworker libs (#34349) - fix(upgrade): zstd-compress bsdiff delta patches (#34354) - fix: allow --inspect=localhost:0 to resolve hostnames (#34230) - fix: panic in deno test --parallel (#34378) - fix: support npm: specifiers in --preload and --import (#34346) - perf(ext/node): reuse keep-alive timer in node:http server (#34302)

← Older Version Deno v2.8.0 Newer Version → Deno v2.8.2