Deno v1.31.0 — 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 6 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.31.0. Source highlight: feat(bench): Add JSON reporter for "deno bench" subcommand (#17595)

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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(bench): Add JSON reporter for "deno bench" subcommand (#17595)
feat(bench): change --json output format (#17888)
feat(core): allow to specify entry point for snapshotted ES modules (#17771)
feat(ext/ffi): Replace pointer integers with v8::External objects (#16889)
feat(ext/http): add 2nd param to handler to get remote address (#17633)
feat(ext/node): embed std/node into the snapshot (#17724)

⚡ Performance & Enhancements (6)

perf(core, runtime): Further improve startup time (#17860)
perf(ext/ffi): Revert UTF-8 validity check from getCString (#17741)
perf(ext/node): move winerror binding to rust (#17792)
perf(http): remove allocations checking upgrade and connection header values
perf: disable fetching graph cache info except for `deno info` (#17698)
perf: module info cache - avoid MediaType.to_string() allocation (#17699)

🔧 Bug Fixes & Patches (6)

fix(cli): Add better error message when powershell is missing during upgrade
fix(cli/graph_util): don't append referrer info for root module errors
fix(cli/napi): correct name handling in napi property descriptor (#17716)
fix(cli/napi): handle all property variants in napi_define_properties (#17680)
fix(core): don't allow to import internal code is snapshot is loaded (#17694)
fix(core): rebuild when JS sources for snapshotting change (#17876)

📄 View Raw Release Notes (Original Developer Log)

### 1.31.0 / 2023.02.23 - feat(bench): Add JSON reporter for "deno bench" subcommand (#17595) - feat(bench): change --json output format (#17888) - feat(core): allow to specify entry point for snapshotted ES modules (#17771) - feat(ext/ffi): Replace pointer integers with v8::External objects (#16889) - feat(ext/http): add 2nd param to handler to get remote address (#17633) - feat(ext/node): embed std/node into the snapshot (#17724) - feat(ext/node): implement `node:v8` (#17806) - feat(install): follow redirects for urls with no path (#17449) - feat(node): stabilize Node-API (#17553) - feat(npm): support bare specifiers from package.json in more subcommands and language server (#17891) - feat(npm): support npm specifiers in remote modules without `--unstable` (#17889) - feat(permissions): grant all permission for a group in permission prompt (#17140) - feat(task): add warning about package.json scripts support (#17900) - feat(task): adjust warning (#17904) - feat(task): support scripts in package.json (#17887) - feat: Deprecate 'deno bundle' subcommand (#17695) - feat: Stabilize Deno.Command API (#17628) - feat: add more variants to Deno.build.os (#17340) - feat: add signal option to Deno.resolveDns (#17384) - feat: auto-discover package.json for npm dependencies (#17272) - feat: stabilize Deno.osUptime() (#17554) - feat: start caching npm package version's "bin" entry from npm registry (#17881) - feat: support bare specifier resolution with package.json (#17864) - feat: wire up ext/node to the Node compatibility layer (#17785) - fix(cli): Add better error message when powershell is missing during upgrade (#17759) - fix(cli/graph_util): don't append referrer info for root module errors (#17730) - fix(cli/napi): correct name handling in napi property descriptor (#17716) - fix(cli/napi): handle all property variants in napi_define_properties (#17680) - fix(core): don't allow to import internal code is snapshot is loaded (#17694) - fix(core): rebuild when JS sources for snapshotting change (#17876) - fix(core): remove async op inlining optimization (#17899) - fix(dts): make Deno.Command accept readonly prop in options.args (#17718) - fix(ext/console): Only right-align integers in console.table() (#17389) - fix(ext/ffi): Fix re-ref'ing UnsafeCallback (#17704) - fix(ext/ffi): improve error messages in FFI module (#17786) - fix(ext/flash): Always send correct number of bytes when handling HEAD requests (#17740) - fix(ext/flash): wrong order of arguments passed to `http1Response` (#17893) - fix(ext/node): add support for BYOB streams (#17803) - fix(ext/node): fix node stream (#17874) - fix(ext/node): fix npm module resolution when --node-modules-dir specified (#17896) - fix(ext/node): fix process.uptime (#17839) - fix(ext/node): fix webcrypto export (#17838) - fix(ext/websocket): extra ws pongs sent (#17762) - fix(fmt): make fmt options CLI args less verbose (#17550) - fix(lint): revert no-deprecated-api for Deno.run (#17880) - fix(npm): allow resolving from package.json when an import map exists (#17905) - fix(npm): filter out duplicate packages names in resolution (#17857) - fix(npm): improve peer dependency resolution (#17835) - fix(npm): resolve node_modules dir relative to package.json instead of cwd (#17885) - fix(npm): support bare specifiers in package.json having a path (#17903) - fix(ops): Always close cancel handles for read_async/write_async (#17736) - fix(webgpu): don't default to 0 for setVertexBuffer.size & properly use webidl.setlike (#17800) - fix(runtime): Refactor fs error mapping to use unified format (#17719) - fix(webgpu): use correct op for GPUDevice.createSampler (#17729) - fix: add WouldBlock error (#17339) - fix: loading built-in Node modules embedded in the binary (#17777) - fix: use static Reflect methods in nodeGlobalThis proxy (#17696) - perf(core): speed up promise hook dispatch (#17616) - perf(core, runtime): Further improve startup time (#17860) - perf(ext/ffi): Revert UTF-8 validity check from getCString (#17741) - perf(ext/node): move winerror binding to rust (#17792) - perf(http): remove allocations checking upgrade and connection header values (#17727) - perf: disable fetching graph cache info except for `deno info` (#17698) - perf: module info cache - avoid MediaType.to_string() allocation (#17699) - perf: remove `current_dir()` call in `Deno.mainModule` (#17883) - perf: use ops for node:crypto ciphers (#17819)

← Older Version Deno v1.30.3 Newer Version → Deno v1.31.1