Deno v1.25.1 — 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 5 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.25.1. Source highlight: feat(ops): support `v8::FastApiCallbackOptions` (#15721)

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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(ops): support `v8::FastApiCallbackOptions` (#15721)
feat(serde_v8): Serialize integers as BigInt (#15692)

⚡ Performance & Enhancements (5)

perf(ext/web): flatten op arguments for text_encoding (#15723)
perf(ops): inline String args (#15681)
perf(runtime): optimize allocations in read/write checks (#15631)
perf: use fast api for `core.isProxy` (#15682)
perf: use fast api for op_now (#15643)

🔧 Bug Fixes & Patches (6)

fix(check): --remote and --no-remote should be mutually exclusive (#14964)
fix(cli): `deno upgrade --canary` always downloaded latest version even if it
fix(compile): panic when running with a populated dep analysis cache (#15672)
fix(docs): add missing categories (#15684)
fix(ext/ffi): Fix pointer types (#15730)
fix(ext/flash): add missing backticks in server docs (#15644)

📄 View Raw Release Notes (Original Developer Log)

### 1.25.1 / 2022.09.01 - feat(ops): support `v8::FastApiCallbackOptions` (#15721) - feat(serde_v8): Serialize integers as BigInt (#15692) - fix(check): --remote and --no-remote should be mutually exclusive (#14964) - fix(cli): `deno upgrade --canary` always downloaded latest version even if it was already latest (#15639) - fix(compile): panic when running with a populated dep analysis cache (#15672) - fix(docs): add missing categories (#15684) - fix(ext/ffi): Fix pointer types (#15730) - fix(ext/flash): add missing backticks in server docs (#15644) - fix(ext/flash): panic on AddrInUse (#15607) - fix(ext/flash): retry write failures (#15591) - fix(ext/node): add missing primordial (#15595) - fix(ext/node): better error for importing ES module via require() call (#15671) - fix(ext/node): fix global in node env (#15622) - fix(ext/websocket): fix closing of WebSocketStream with unread messages (#15632) - fix(fmt): add the file path to the panic messages when formatting is unstable (#15693) - fix(npm): better node version and version requirement compatibility (#15714) - fix(npm): conditional exports with wildcards (#15652) - fix(npm): handle cjs re-exports with the same name as an export (#15626) - fix(npm): ignore npm cache directory creation errors (#15728) - fix(npm): ignore the unstable error in the lsp (#15727) - fix(npm): prefer importing esm from esm (#15676) - fix(npm): skip extracting pax_global_header from tarballs (#15677) - fix(npm): translate CJS to ESM with name clashes for files and dirs (#15697) - fix(serde_v8): no panic on reading large text file (#15494) - fix(serde_v8): update bytes::Bytes layout assumptions (#15718) - fix: avoid global declaration collisions in cjs (#15608) - fix: config file errors should not print specifier with debug formatting (#15648) - fix: typo in deno_ops README (#15606) - perf(ext/web): flatten op arguments for text_encoding (#15723) - perf(ops): inline String args (#15681) - perf(runtime): optimize allocations in read/write checks (#15631) - perf: use fast api for `core.isProxy` (#15682) - perf: use fast api for op_now (#15643) - serde_v8: fix pointer size assumptions (#15613)

← Older Version Deno v1.25.0 Newer Version → Deno v1.25.2