The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →On May 18, 2023, Bytes issue #188 reported that Bun had introduced a beta bundler and minifier as another step toward combining JavaScript runtime and build tools. The issue named the command-line tool bun build and the JavaScript API Bun.build(). Its feature list and speed figures describe that 2023 beta, not Bun’s current capabilities.
What Bun added in the 2023 beta
Bytes described the bundler as a way to build and minify JavaScript and TypeScript projects within Bun’s emerging all-in-one toolchain. Developers could invoke it from a terminal with bun build or use Bun.build() from JavaScript. The issue’s account is a secondary report; Bun’s linked announcement was unavailable, so the reported rationale and feature details should be understood as what Bytes said at the time.
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That integration was the point: a project using Bun could use a build tool from the same ecosystem as its runtime instead of assembling a separate bundler setup. This does not, by itself, establish that Bun’s bundler was compatible with every project or a drop-in replacement for other tools.
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Why Bun said it was building a bundler
Bytes attributed three priorities to Bun creator Jarred Sumner: cohesiveness, performance, and developer experience. It quoted him as saying, “no one likes wrestling with bundler configurations.” The remark is reported by Bytes; the original Bun announcement could not be independently checked.
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- Cohesiveness: Bundling was part of Bun’s effort to bring runtime and build tooling together rather than leave developers to manage a complex collection of separate tools.
- Performance: The issue said Bun could reuse parts of its existing codebase for the bundler.
- Developer experience: Bytes characterized the beta as prioritizing speed and stability over feature completeness.
What the beta supported—and what it did not yet include
Bytes reported three named build targets: browser, bun, and node. It also said the beta handled most common file types and included experimental support for React Server Components. Those descriptions reflect the issue’s May 2023 account; they are not a current compatibility list.
Hot module reloading (HMR) was not available at the time. Bytes said it was anticipated in the following weeks, which records an expectation in 2023 rather than confirming when or whether that milestone was delivered.
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What the published speed comparison actually measured
The Bun repository README describes a specific benchmark: bundling ten copies of three.js with minification and source maps enabled on a 16-inch MacBook Pro with an M1 chip. It reports these results; the page does not state a date for the figures, and its contents can change:
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| Tool | Reported result |
|---|---|
| Bun | 0.17 seconds |
| esbuild | 0.33 seconds |
| Rollup | 18.82 seconds |
| Webpack | 26.21; the README table cell omits the unit |
| Parcel | 17.95 seconds |
These are outputs for one workload on one machine, as reported by Bun’s repository—not a general ranking across applications, hardware, configurations, or plugin ecosystems. They do not establish how the tools compare on a reader’s own project.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess Bun’s bundler for a real project
The 2023 issue does not provide a broad comparative evaluation. Anyone choosing a bundler should check the needs of their specific project rather than treating the benchmark as a verdict:
- Runtime and build-tool integration: Would using the same ecosystem for both simplify the project’s workflow?
- Targets and formats: Does the current version support the exact output targets and file formats the project needs?
- Framework and plugin compatibility: Do the framework integrations and plugins the project relies on work as expected?
- Development workflow: Does the tool provide the development server and HMR behavior the team requires?
- Configuration: Does it reduce complexity without sacrificing necessary control?
- Performance: How does it perform on a representative build from the project, on the hardware and settings the team actually uses?
Because Bun’s toolchain has evolved since 2023, consult current Bun documentation before relying on the issue’s historical feature list. The May 2023 report is useful for understanding the beta’s goals and early scope, not for deciding current compatibility.
Quick Recap
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