Deno v1.25.3 — 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

⚡ Improvements 4 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.25.3. Source highlight: doc(unstable): mention that `signal` input isn't supported in `spawnSync`

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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.

⚡ Performance & Enhancements (4)

perf(ext/flash): remove string->buffer cache (#15850)
perf(serde_v8): remove Mutex from ZeroCopyBuf (#15888)
perf(url): return early if url has no query string (#15856)
perf: optimize URL serialization (#15663)

🔧 Bug Fixes & Patches (6)

fix(ext/flash): don't block requests (#15852)
fix(npm): align Deno importing Node cjs with Node esm importing cjs (#15879)
fix(npm): align Node esm code importing cjs with Node (#15838)
fix(npm): binary entrypoint for .js or no extension (#15900)
fix(npm): remove export binding to match node (#15837)
fix(npm): support cjs resolution of package subpath with package.json (#15855)

📄 View Raw Release Notes (Original Developer Log)

### 1.25.3 / 2022.09.15 - doc(unstable): mention that `signal` input isn't supported in `spawnSync` (#15889) - fix(ext/flash): don't block requests (#15852) - fix(npm): align Deno importing Node cjs with Node esm importing cjs (#15879) - fix(npm): align Node esm code importing cjs with Node (#15838) - fix(npm): binary entrypoint for .js or no extension (#15900) - fix(npm): remove export binding to match node (#15837) - fix(npm): support cjs resolution of package subpath with package.json (#15855) - fix(npm): use shim from deno_node crate for 'module' built-in module (#15881) - fix(ops): add node.js env variable allowlist (#15893) - perf(ext/flash): remove string->buffer cache (#15850) - perf(serde_v8): remove Mutex from ZeroCopyBuf (#15888) - perf(url): return early if url has no query string (#15856) - perf: optimize URL serialization (#15663)

← Older Version Deno v1.25.2 Newer Version → Deno v1.25.4