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tech 24 July 2026

Buz: A Fork of Bun Using Modern Zig with Sub-1s Incremental Builds

Discover Buz, a promising fork of Bun using modern Zig, offering lightning-fast incremental builds. A developing project aimed at modernizing code and reducing technical debt.

Article inspired by the original source
Buz – A fork of Bun using modern Zig, with sub-1s incremental builds ↗ ziggit.dev

Introduction

In the ever-evolving world of software development, build efficiency is crucial. Today, we present Buz, a fork of Bun using the Zig language for sub-1 second incremental builds. This project is still in its early stages, but it promises to revolutionize how developers interact with their code.

Why Buz?

Buz was created from the last Bun version before its transition to Rust. The goal is simple: to provide an alternative to Bun with a cleaner and more modern codebase. By removing over 11,000 lines of unnecessary code, Buz aims to reduce technical debt while integrating the latest features and bug fixes.

Zig: A Strategic Choice

Zig, an emerging programming language, was chosen for its performance and simplicity. By using Zig, Buz benefits from extremely fast incremental builds, significantly improving the development loop. Indeed, sub-1 second builds allow developers to test and integrate changes at an unprecedented speed.

Challenges and Opportunities

While promising, Buz is not yet production-ready. Many tests still need to be passed, and the project is undergoing cleanup and modernization. The use of language models (LLMs) to rewrite subsystems is being considered, with the goal of simplifying and sanitizing the codebase.

The Role of LLMs

The integration of LLMs into Buz's development is not just a trend. It addresses the complexity of a massive codebase inherited from Bun. By delegating some coding tasks to LLMs, developers can focus on strategic and creative aspects of development.

The Future of Buz

Buz aims to become a viable alternative to Rust Bun 1.4.0. By modernizing the codebase with Zig, the project hopes to offer a more pleasant solution to maintain in the long term. The focus is on reducing technical debt and adopting best development practices.

Conclusion

Buz represents an ambitious initiative in the landscape of development tools. With Zig and a focus on reducing technical debt, it could very well redefine industry standards.

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