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Deno v1.25.0stable Released Aug 25, 2022
⚠️ Breaking Change Impact Score: 7/10

Deno v1.25.0 — 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.

Breaking-change evidence from the source

  • - BREAKING(ext/ffi): specialized `buffer` type (#15518)
Read the original context ↗
Source flags breaking changes — review applicability
📄 .MD
✨ Features 6 ⚡ Improvements 3 🔧 Bug Fixes 6 ⚠️ Breaking & Deprecations 1
⚡ Executive Summary (TL;DR)

Deno v1.25.0. Source highlight: BREAKING(ext/ffi): specialized `buffer` type (#15518)

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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.

⚠️ Breaking Changes & Deprecations (1)

  • - BREAKING(ext/ffi): specialized `buffer` type (#15518)

✨ New Features & Capabilities (6)

  • feat(ext/crypto): deriveBits P-384 (#15138)
  • feat(ext/flash): An optimized http/1.1 server (#15405)
  • feat(ext/flash): split upgradeHttp into two APIs (#15557)
  • feat(ops): V8 Fast Calls (#15291)
  • feat(repl): add color to functions for syntax highlighting (#15434)
  • feat(runtime): add pre_execute_module_cb (#15485)

⚡ Performance & Enhancements (3)

  • perf(runtime): optimize Deno.file open & stream (#15496)
  • perf: cache swc dependency analysis and don't hold onto `ParsedSource`s in
  • perf: improve performance.now (#15481)

🔧 Bug Fixes & Patches (6)

  • fix(cache): do not attempt to emit non-emitable files (#15562)
  • fix(core/runtime): always cancel termination in exception handling (#15514)
  • fix(coverage): ensure coverage is only collected in certain situations
  • fix(ext/fetch): ignore user content-length header (#15555)
  • fix(ext/flash): concurrent response streams (#15493)
  • fix(ext/flash): fix default onListen callback (#15533)
📄 View Raw Release Notes (Original Developer Log)
### 1.25.0 / 2022.08.24 - BREAKING(ext/ffi): specialized `buffer` type (#15518) - feat(ext/crypto): deriveBits P-384 (#15138) - feat(ext/flash): An optimized http/1.1 server (#15405) - feat(ext/flash): split upgradeHttp into two APIs (#15557) - feat(ops): V8 Fast Calls (#15291) - feat(repl): add color to functions for syntax highlighting (#15434) - feat(runtime): add pre_execute_module_cb (#15485) - feat(unstable): initial support for npm specifiers (#15484) - feat: `queueMicrotask()` error handling (#15522) - feat: add "deno init" subcommand (#15469) - fix(cache): do not attempt to emit non-emitable files (#15562) - fix(core/runtime): always cancel termination in exception handling (#15514) - fix(coverage): ensure coverage is only collected in certain situations (#15467) - fix(ext/fetch): ignore user content-length header (#15555) - fix(ext/flash): concurrent response streams (#15493) - fix(ext/flash): fix default onListen callback (#15533) - fix(ext/flash): fix listening port (#15519) - fix: Free up JsRuntime state global handles before snapshot (#15491) - fix: resolve `jsxImportSource` relative to module (#15561) - perf(runtime): optimize Deno.file open & stream (#15496) - perf: cache swc dependency analysis and don't hold onto `ParsedSource`s in memory (#15502) - perf: improve performance.now (#15481)
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