Impact Score: 5/10
Bun v0.5.4
Source available โ automated, not human-reviewed
Component: bun ยท Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
โก Executive Summary (TL;DR)
Bun bun-v0.5.4. Source highlight: This fixes a couple bugs from Bun v0.5.2. Otherwise, it's the same as Bun v0.5.2
Who Does This Impact? (Role-Based Analysis)
๐ป Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
๐ Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
โ๏ธ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
โจ New Features & Capabilities (4)
- feat(dns) resolveSrv
- enhancement(fetch): Merge parameters from request parameter with the second parameter for fetch, move verbose and proxy options to second parameter, add non-TLS tests for fetch
- Add FileSystemRouter + React example
- normalise `bun add` package specifiers
๐ง Bug Fixes & Patches (6)
- fix constructor statement order
- fix child process node test hang
- fix(Buffer) Fix arguments in buffer.write, fix size returned from buffer.write for utf16, fix size calc for base64, fix calc for hex byte size
- fix(WebSocket) Fix large packages receive for WS client
- fix websocket hang
- fix(Express.js) Express.js try to use function as hostname
๐ View Raw Release Notes (Original Developer Log)
This fixes a couple bugs from Bun v0.5.2. Otherwise, it's the same as Bun v0.5.2
**[Read Bun v0.5.2's release notes on Bun's blog](https://bun.sh/blog/bun-v0.5.2)**
This release is a follow up to [Bun v0.5](https://github.com/oven-sh/bun/releases/tag/bun-v0.5.0) and [Bun v0.5.1](https://github.com/oven-sh/bun/releases/tag/bun-v0.5.1)
To install:
```bash
curl https://bun.sh/install | bash
# or you can use npm
# npm install -g bun
```
To upgrade:
```bash
bun upgrade
```
<a href="https://bun.sh/blog/bun-v0.5.2">
<img src="https://user-images.githubusercontent.com/709451/215659858-ddb2c7ce-086a-46cc-ab37-c0dcf2abe17e.png" />
</a>
## What's Changed
* constructor parameter properties are lowered in class expressions by @dylan-conway in https://github.com/oven-sh/bun/pull/1867
* [semver] parse `^` & `~` expressions correctly by @alexlamsl in https://github.com/oven-sh/bun/pull/1854
* minor clean-ups by @alexlamsl in https://github.com/oven-sh/bun/pull/1869
* feat(dns) resolveSrv by @cirospaciari in https://github.com/oven-sh/bun/pull/1870
* enhancement(fetch): Merge parameters from request parameter with the second parameter for fetch, move verbose and proxy options to second parameter, add non-TLS tests for fetch by @cirospaciari in https://github.com/oven-sh/bun/pull/1862
* fix constructor statement order by @dylan-conway in https://github.com/oven-sh/bun/pull/1883
* fix child process node test hang by @dylan-conway in https://github.com/oven-sh/bun/pull/1884
* fix(Buffer) Fix arguments in buffer.write, fix size returned from buffer.write for utf16, fix size calc for base64, fix calc for hex byte size by @cirospaciari in https://github.com/oven-sh/bun/pull/1881
* `npm install bun` by @Electroid in https://github.com/oven-sh/bun/pull/1874
* support `bun link` of scoped packages by @alexlamsl in https://github.com/oven-sh/bun/pull/1892
* support GitHub URLs as dependencies by @alexlamsl in https://github.com/oven-sh/bun/pull/1875
* Add FileSystemRouter + React example by @scally in https://github.com/oven-sh/bun/pull/1894
* parse package-spec from CLI correctly by @alexlamsl in https://github.com/oven-sh/bun/pull/1895
* fix(WebSocket) Fix large packages receive for WS client by @cirospaciari in https://github.com/oven-sh/bun/pull/1909
* fix websocket hang by @dylan-conway in https://github.com/oven-sh/bun/pull/1910
* Implement all pending resolve methods in DNS by @cirospaciari in https://github.com/oven-sh/bun/pull/1903
* fix(Express.js) Express.js try to use function as hostname by @cirospaciari in https://github.com/oven-sh/bun/pull/1914
* ensure name is allocated with `toSliceClone` by @dylan-conway in https://github.com/oven-sh/bun/pull/1917
* [WIP] append GitHub package after fully parsed by @alexlamsl in https://github.com/oven-sh/bun/pull/1911
* fix(bench): Fix if condition always being true by @u9g in https://github.com/oven-sh/bun/pull/1923
* fix corner cases with aliased dependencies by @alexlamsl in https://github.com/oven-sh/bun/pull/1927
* normalise `bun add` package specifiers by @alexlamsl in https://github.com/oven-sh/bun/pull/1924
* parse `git+https://github.com/` as GitHub URLs by @alexlamsl in https://github.com/oven-sh/bun/pull/1926
* Support running WASI (WebAssembly) files using `bun run` by @Jarred-Sumner in https://github.com/oven-sh/bun/pull/1929
* [bun add] fix more corner cases by @alexlamsl in https://github.com/oven-sh/bun/pull/1930
* Update README.md by @Ygnys in https://github.com/oven-sh/bun/pull/1934
* [bunx] fix version parsing by @alexlamsl in https://github.com/oven-sh/bun/pull/1937
* report invalid input file as test failure by @alexlamsl in https://github.com/oven-sh/bun/pull/1938
* fix `assert()` crash by @alexlamsl in https://github.com/oven-sh/bun/pull/1941
* fix utf16le fill and utf8 partial write of utf16 by @cirospaciari in https://github.com/oven-sh/bun/pull/1943
## New Contributors
* @scally made their first contribution in https://github.com/oven-sh/bun/pull/1894
* @Ygnys made their first contribution in https://github.com/oven-sh/bun/pull/1934
**Full Changelog**: https://github.com/oven-sh/bun/compare/bun-v0.5.1...bun-v0.5.2