Buz – A fork of Bun using modern Zig, with sub-1s incremental builds
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A fork of Bun using modern Zig claims sub-1s incremental builds and 11,000 lines of dead code removed.
Buz is a WIP drop-in replacement for Bun forked from the last commit before Bun's Rust rewrite. The author ported Bun to build with upstream Zig, placing the entire build graph in build.zig including vendored JavaScriptCore sources. They claim sub-1s incremental builds and have removed 11,000 lines of dead code. The project will use LLMs extensively to rewrite subsystems and will not accept human contributions until the codebase is in a sane state. Many tests from Rust Bun have been imported but don't all pass yet.
What commenters are saying
Commenters split on viability. Some support the code quality focus, calling it a Herculean task; others joke it's Sisyphean. A recurring debate questions whether LLMs can meaningfully 'deslop' code originally produced by LLMs. Several commenters note the project's 'no humans allowed' contribution policy is absurd yet rational. Skeptics argue maintaining a full JS runtime without an ecosystem is unsustainable, while others see potential if Buz focuses narrowly on being a fast, memory-efficient runtime rather than an all-in-one tool.