Deno v1.26.2 — 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 v1.26.2. Source highlight: feat(core): Reorder extension initialization (#16136)

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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 (6)

feat(core): Reorder extension initialization (#16136)
feat(core): add Deno.core.writeAll(rid, chunk) (#16228)
feat(core): improve resource read & write traits (#16115)
feat(unstable): add windowsRawArguments to SpawnOptions (#16319)
feat(unstable/npm): support providing npm dist-tag in npm package specifier
feat(unstable/task): add `INIT_CWD` env var (#16110)

⚡ Performance & Enhancements (6)

perf(ext/cache): set journal_mode=wal (#16231)
perf(ext/crypto): optimize `getRandomValues` (#16212)
perf(ext/web): optimize `op_cancel_handle` (#16318)
perf(ext/web): optimize timer cancellation (#16316)
perf(napi): optimize primitive napi functions (#16163)
perf(npm): parallelize caching of npm specifier package infos (#16323)

🔧 Bug Fixes & Patches (6)

fix sparse array inspection (#16204)
fix(build) fix linux symbols export list format (#16313)
fix(cli): allow importMap to be an absolute URL within the deno config file
fix(cli): skip removing the latter part if `@` appears at the beginning
fix(cli/bench): skip strace table border (#16310)
fix(docs): Documentation improvements related to `JsRealm`. (#16247)

📄 View Raw Release Notes (Original Developer Log)

### 1.26.2 / 2022.10.17 - feat(core): Reorder extension initialization (#16136) - feat(core): add Deno.core.writeAll(rid, chunk) (#16228) - feat(core): improve resource read & write traits (#16115) - feat(unstable): add windowsRawArguments to SpawnOptions (#16319) - feat(unstable/npm): support providing npm dist-tag in npm package specifier (#16293) - feat(unstable/task): add `INIT_CWD` env var (#16110) - fix sparse array inspection (#16204) - fix(build) fix linux symbols export list format (#16313) - fix(cli): allow importMap to be an absolute URL within the deno config file (#16234) - fix(cli): skip removing the latter part if `@` appears at the beginning (#16244) - fix(cli/bench): skip strace table border (#16310) - fix(docs): Documentation improvements related to `JsRealm`. (#16247) - fix(ext/cache): illegal constructor (#16205) - fix(ext/crypto): correct HMAC get key length op (#16201) - fix(ext/fetch): fix illegal header regex (#16236) - fix(ext/fetch): reject immediately on aborted signal (#16190) - fix(ext/fetch): set accept-encoding: identity if range header is present (#16197) - fix(ext/fetch): support empty formdata (#16165) - fix(ext/fetch): throw TypeError on non-Uint8Array chunk (#16262) - fix(ext/fetch): throw TypeError on read failure (#16219) - fix(ext/ffi): Fix UnsafeCallback ref'ing making Deno enter a live-loop (#16216) - fix(ext/ffi): Fix usize and isize FFI callback parameters missing match arm (#16172) - fix(ext/ffi): Invalid 'function' return type check logic, remove U32x2 as unnecessary (#16259) - fix(ext/web/streams): enqueue to second branch before closing (#16269) - fix(ext/web/streams): resolve cancelPromise in ReadableStreamTee (#16266) - fix(ext/websocket): panic on no next ws message from an already closed stream (#16004) - fix(lsp): properly handle snippets on completions (#16274) - fix(lsp): treat empty import map value config as none (#16224) - fix(napi): move napi symbols file (#16179) - fix(npm): disable loading native module for "fsevents" package (#16273) - fix(npm): support compiling on linux/aarch64 (#16208) - fix(serde_v8): avoid creating unsound slice reference (#16189) - fix: add error cause in recursive cause tail (#16306) - perf(ext/cache): set journal_mode=wal (#16231) - perf(ext/crypto): optimize `getRandomValues` (#16212) - perf(ext/web): optimize `op_cancel_handle` (#16318) - perf(ext/web): optimize timer cancellation (#16316) - perf(napi): optimize primitive napi functions (#16163) - perf(npm): parallelize caching of npm specifier package infos (#16323)

← Older Version Deno v1.26.1 Newer Version → Deno v1.27.0