Ahead-of-time compilation for bun build --compile (
8d5672c)
Bun now supports bun build --compile --aot, compiling TypeScript and JavaScript to machine code at build time so the executable starts as machine code and ships without a JIT. The change also wires up dedicated AOT test lanes and hardened build handling, making this a major new runtime/build feature.
CSS parser fixes consolidated into one pass (7942008)
This rolls a large set of CSS parser/minifier/lowering/printing fixes into a single release. The goal is correctness against browser behavior, with changes spanning parsing, media queries, properties, CSS modules, and printer logic after broad validation against real stylesheets.
Bun’s WebKit engine is upgraded twice, including a hot follow-up (
a0cc096, 9b8347a)
The repo first moves to WebKit 982277c9dd3e, then immediately advances again to 191c6a41380b. These updates adjust Bun’s build flags, prebuilt naming, and engine compatibility tests, keeping the embedded JavaScriptCore snapshot current.
bytemuck is replaced with an in-tree POD crate (92e819d)
Bun removes the external bytemuck dependency in favor of a new bun_pod crate, re-exported through bun_core. That shifts byte/value casting into repo-owned, compiler-checked traits and APIs, reducing dependency surface and tightening the safety model around raw byte conversions.
Safe Rust tar/gzip implementation replaces libarchive (c643ea8)
libarchive is removed and replaced with native Rust tar and gzip handling. This is a substantial maintenance and safety win: Bun now owns the archive logic directly instead of relying on a large C dependency and its patch stack.
Core lifetime fixes close use-after-free bugs (8a0e49e, 98a4365)
These commits make string and source lifetimes real in the type system, fixing use-after-free issues in error printing and BuildMessage.position.file. They’re high-impact correctness fixes because they turn previously latent memory bugs into compile-time errors across the AST, bundler, and string layers.
Histograms move to safe Rust and Node semantics are corrected (99ee03e)
Bun drops HdrHistogram and replaces perf_hooks histogram tracking with a new safe Rust implementation. The change also aligns createHistogram() and monitorEventLoopDelay() behavior with modern Node semantics, which matters for observability and API compatibility.
Other misc changes
- Removed obsolete scheduled dependency-update workflows for libarchive and HdrHistogram.
- Documentation updates for CSS bundling, Windows build paths, AOT compatibility, and Rust ownership guidance.
- Build/script tweaks for WebKit packaging, hardened builds, and Rust lint/miri coverage.
- Small refactors in Bun string handling, builtin codegen, and WebKit build flags.