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Yes. Bun 1.1 brought Bun’s runtime, test runner, package manager, and bundler to Windows 10 and later. Bytes issue #276, published April 1, 2024, called the launch “Bundows”; the nickname framed a real release, not a separate product. The announcement and its figures are historical: they describe Bun’s claims at launch, not current benchmarks or a guarantee that every Node.js project will work unchanged.
What “Bundows” refers to
“Bundows” was the playful headline of Bytes issue #276, published April 1, 2024. Its central story was Bun 1.1’s Windows release. Bun described itself as an all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript, and said the 1.1 release included more than 1,700 commits and fixes for over 1,000 bugs since Bun 1.0. Those counts are Bun’s own release-post statements.
The April Fools’ Day timing and joking headline did not make the Windows launch a joke. Bun’s official Bun 1.1 announcement, also dated April 1, 2024, documents the release.
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Which parts of Bun 1.1 worked on Windows?
Bun said version 1.1 ran on Windows 10 and later, with its four core components available there:
#1 Best Overall
- 14" diagonal, 1366x768 resolution, HD BrightView LED, Glossy NON-TOUCH Display
- Runtime: runs JavaScript and TypeScript.
- Test runner: runs tests using Bun’s built-in runner.
- Package manager: installs project dependencies with
bun install. - Bundler: builds and bundles applications.
Bun reported that its Windows build passed 98% of the macOS and Linux test suite it used. That is a result reported by Bun for its own suite, not an independent assessment of Windows compatibility or proof that every application behaves identically across operating systems.
What Bun claimed about Windows performance
Bun’s release announcement published the following Windows comparisons. They are vendor-reported launch-era figures, not independent measurements, and should not be treated as results for current versions or as predictions for every project.
Rank #2
- 256 GB SSD of storage.
- Multitasking is easy with 16GB of RAM
- Equipped with a blazing fast Core i5 2.00 GHz processor.
| Task | Bun’s reported comparison | Scope and qualification |
|---|---|---|
| Dependency installation | bun install was 18× faster than Yarn and 30× faster than npm. |
Bun’s Windows comparison installing a Vite React app; the app’s scripts were configured with --ignore-scripts. |
| Running package scripts | bun run was 11× faster than npm run. |
Bun’s Windows release-era claim. |
| Running package executables | bunx was 11× faster than npx. |
Bun’s Windows release-era claim. |
The figures answer what Bun advertised in 2024, not which tool will be faster for a particular project. The announcement does not establish independent replication or that the same ratios apply to different apps, machines, dependency trees, or later releases. For a real migration decision, compare the same project and task on the actual machine and tool versions you plan to use.
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What else arrived with Bun 1.1?
Bun Shell
Bun introduced Bun Shell as a cross-platform, shell-like tool callable from JavaScript and TypeScript through Bun.$. It uses familiar shell syntax and provides built-in utilities, with the goal of making shell tasks usable across operating systems from application code.
Rank #3
- EFFORTLESS EVERYDAY PERFORMANCE: Powered by Intel Celeron N4020 processor and Windows 11 Home system, delivering reliable, low-power efficiency for daily tasks like document editing, email, online classes, and web browsing
- 15.6-INCH FULL HD DISPLAY: Enjoy immersive visuals on the 15.6" FHD (1920x1080) anti-glare screen with micro-edge bezels. Delivers clear details and comfortable viewing for long study sessions, working on spreadsheets, and video playback
- RESPONSIVE MULTITASKING & STORAGE: Built with 4GB LPDDR4 RAM and 128GB eMMC storage for smooth daily essential use. Expand your storage by up to 1TB via the integrated TF card slot to easily store movies, photos, and working files
- ADVANCED CONNECTIVITY: Outfitted with 2x Full-Featured Type-C ports for data transfer, fast charging, and dual-monitor output, alongside 2x USB 3.2 Gen1 ports and a 3.5mm audio jack for complete peripheral compatibility
- LIGHTWEIGHT & SILENT OPERATION: Slim and portable for effortless travel or commuting. Features a 1MP HD webcam for remote meetings, 38Wh battery with 45W Type-C fast charging, and a fanless silent design for peaceful work environments.
Executable launching on Windows
Bun described a .bunx cross-filesystem symlink format for launching scripts or executables with Bun or Node.js. The release post said it addressed Windows differences involving symlinks and shebangs, and avoided needing separate .cmd, .sh, and .ps1 variants for each executable.
Glob, Semver, and server APIs
The release added built-in Glob and Semver APIs. It also listed APIs including server.url, server.requestIP(), and import.meta.env. These additions were part of the broader 1.1 release rather than Windows-only features.
Rank #4
- WINDOWS 11 | STABLE PERFORMANCE: Powered by Intel Celeron N4020 processor and Windows 11 system, this laptop delivers stable performance for everyday computing tasks. It supports web browsing, online learning, document editing, email communication, and basic office work with optimized power efficiency, providing a practical and reliable experience for essential daily use for daily use.
- 15.6” FHD IPS DISPLAY: Features a 15.6-inch Full HD IPS display with narrow bezels, offering wider viewing angles and clearer image details compared to standard panels. The improved screen-to-body ratio enhances visual experience for study, reading, document work, and video playback, making it suitable for both productivity and entertainment use.
- 4GB DDR4 + 128GB eMMC STORAGE: Equipped with 4GB DDR4 memory and 128GB eMMC storage for everyday basics such as browsing, documents, email, and online learning platforms. The built-in TF card slot supports storage expansion up to 1TB, giving you more flexibility for files, photos, videos, and daily documents. TF card not included.
- CONNECTIVITY & PORTS: Includes 1× TF card slot, 2× USB 3.2 Gen1 ports, and 2× full-featured Type-C ports (USB 3.2 Gen1). The Type-C ports support data transfer, charging, and video output, enabling flexible connection with external devices such as monitors, storage, and peripherals for daily work and study use.
- LIGHTWEIGHT DESIGN | ONLINE COMMUNICATION: Designed with a slim, portable profile, this laptop is easy to carry for school, commuting, and travel. A built-in 1MP front camera supports online classes, video meetings, remote communication, and everyday conferencing. The 3300mAh battery works with the low-power system design to support practical daily use, while thermal optimization helps maintain quieter operation during extended tasks.
Node.js compatibility work
Bun’s announcement listed compatibility improvements including HTTP/2 client APIs, recursive fs.readdir(), IPC between Bun and Node.js processes, and other Node API additions and fixes. It also described changes to use Windows system calls for Node APIs, giving fs.readdir() as one example.
The Tool Desk
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Bun 1.1 answers the historical question of when Bun’s core toolkit arrived on Windows: Bun announced support for Windows 10 and later on April 1, 2024. It does not establish the current Bun version, present-day compatibility, or current performance. Bun’s blog index records releases after 1.1, so consult newer release materials for present-day claims.
If you are evaluating Bun for a project, check the current release notes for the version you intend to install, then verify the project’s Node.js APIs and dependencies and test its install, scripts, tests, and build. The 1.1 launch figures are useful context about what Bun claimed then, not a substitute for a project-specific comparison.
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