Deno v1.44.0 — 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(ffi/unstable): always return u64 as bigint (#23981)
- BREAKING(ffi/unstable): use BigInt representation in turbocall (#23983)

Read the original context ↗

Source flags breaking changes — review applicability

📄 .MD

✨ Features 6 ⚡ Improvements 6 🔧 Bug Fixes 6 ⚠️ Breaking & Deprecations 2

⚡ Executive Summary (TL;DR)

Deno v1.44.0. Source highlight: BREAKING(ffi/unstable): always return u64 as bigint (#23981)

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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 (2)

- BREAKING(ffi/unstable): always return u64 as bigint (#23981)
- BREAKING(ffi/unstable): use BigInt representation in turbocall (#23983)

✨ New Features & Capabilities (6)

feat(cli): Add slow test warning (#23874)
feat(cli/test): `deno test --clean` (#23519)
feat(ext/fetch): `Request.bytes()` and `Response.bytes()` (#23823)
feat(ext/fs): stabilize `Deno.FsFile.syncData[Sync]()` and
feat(ext/fs): stabilize `Deno.FsFile.unlock[Sync]()` and
feat(ext/webgpu): byow support for {Free,Open}BSD (#23832)

⚡ Performance & Enhancements (6)

perf(cli): Improve concurrency when setting up `node_modules` and loading
perf(cli): Optimize setting up `node_modules` on macOS (#23980)
perf(lsp): lock out requests until init is complete (#23998)
perf(repl): don't walk workspace in repl language server (#24037)
perf(startup): use WAL journal for sqlite databases in DENO_DIR (#23955)
perf: avoid building module graph if dynamic specifier already in graph

🔧 Bug Fixes & Patches (6)

fix(cli): Prefer npm bin entries provided by packages closer to the root
fix(cli): Support deno.lock with only package.json present + fix DENO_FUTURE
fix(cli/test): decoding percent-encoding(non-ASCII) file path correctly
fix(coverage): add tooltip to line count in html report (#23971)
fix(coverage): do not generate script coverage with empty url (#24007)
fix(coverage): handle ignore patterns (#23974)

📄 View Raw Release Notes (Original Developer Log)

### 1.44.0 / 2024.05.30 - BREAKING(ffi/unstable): always return u64 as bigint (#23981) - BREAKING(ffi/unstable): use BigInt representation in turbocall (#23983) - FUTURE(ext/ffi,ext/webgpu): stabilize FFI and WebGPU APIs (#24011) - FUTURE(ext/fs): stabilize file system APIs (#23968) - FUTURE: initial support for .npmrc file (#23560) - feat(cli): Add slow test warning (#23874) - feat(cli/test): `deno test --clean` (#23519) - feat(ext/fetch): `Request.bytes()` and `Response.bytes()` (#23823) - feat(ext/fs): stabilize `Deno.FsFile.syncData[Sync]()` and `Deno.FsFile.sync[Sync]()` (#23733) - feat(ext/fs): stabilize `Deno.FsFile.unlock[Sync]()` and `Deno.FsFile.lock[Sync]()` (#23754) - feat(ext/webgpu): byow support for {Free,Open}BSD (#23832) - feat(lint): add `no-boolean-literal-for-arguments` rule and enable `no-unused-vars` for jsx files (#24034) - feat(lsp): support .npmrc (#24042) - feat(node): buffer isUtf8/isAscii (#23928) - feat(serve): support `--port 0` to use an open port (#23846) - feat(task): run `npm run` commands with Deno more often (#23794) - feat(vendor): support modifying remote files in vendor folder without checksum errors (#23979) - feat: Add `Deno.exitCode` API (#23609) - feat: add lowercase `-v` version flag (#23750) - feat: do not require `DENO_FUTURE=1` for npmrc support (#24043) - feat: enable pointer compression via deno_core bump (#23838) - fix(cli): Prefer npm bin entries provided by packages closer to the root (#24024) - fix(cli): Support deno.lock with only package.json present + fix DENO_FUTURE install interactions with lockfile (#23918) - fix(cli/test): decoding percent-encoding(non-ASCII) file path correctly (#23200) - fix(coverage): add tooltip to line count in html report (#23971) - fix(coverage): do not generate script coverage with empty url (#24007) - fix(coverage): handle ignore patterns (#23974) - fix(coverage): skip generating coverage json for http(s) scripts (#24008) - fix(deno_task): more descriptive error message (#24001) - fix(ext/fs): truncate files when a ReadableStream is passed to writeFile (#23330) - fix(ext/http): flush gzip streaming response (#23991) - fix(ext/node): add `throwIfNoEntry` option in `fs.lstatSync` (#24006) - fix(ext/node): add stubs for perf_hooks.PerformaceObserver (#23958) - fix(ext/node): don't encode buffer data as utf8 in http2 (#24016) - fix(ext/node): return cancelled flag in get_response_body_chunk op (#23962) - fix(ext/node): windows cancel stdin read in line mode (#23969) - fix(ext/node/fs): `position` argument not applied (#24009) - fix(ext/web): `ReadableStream.from()` allows `Iterable` instead of `IterableIterator` (#23903) - fix(ext/web): `ReadableStream.from()` ignores null `Symbol.asyncIterator` (#23910) - fix(ext/websocket): change default idleTimeout to 30s (#23985) - fix(lsp): don't discover deno.json in vendor dir (#24032) - fix(lsp): process Fenced Code Block in JSDoc on `completion` correctly (#23822) - fix(node): set default http server response code 200 (#23977) - fix(npm): set up node_modules/.bin/ entries for package that provide bin entrypoints (#23496) - fix(publish): raise diagnostics for triple-slash directives for `--dry-run` instead of just `publish` (#23811) - fix(runtime): use more null proto objects (#23921) - fix(task): always use `npm` for `npm run` with flags (#24028) - fix: `--env` flag confusing message on syntax error (#23915) - fix: bump cache sqlite dbs to v2 for WAL journal mode change (#24030) - fix: empty `process.platform` with `__runtime_js_sources` (#24005) - fix: use hash of in-memory bytes only for code cache (#23966) - perf(cli): Improve concurrency when setting up `node_modules` and loading cached npm package info (#24018) - perf(cli): Optimize setting up `node_modules` on macOS (#23980) - perf(lsp): lock out requests until init is complete (#23998) - perf(repl): don't walk workspace in repl language server (#24037) - perf(startup): use WAL journal for sqlite databases in DENO_DIR (#23955) - perf: avoid building module graph if dynamic specifier already in graph (#24035) - perf: parse source files in parallel (#23858) - perf: skip npm install if graph has no new packages (#24017)

← Older Version Deno v1.43.6 Newer Version → Deno v1.44.1