Bun owns its parser, AST, printer, transforms, quality tools, language services and shared collections under src/. The root Cargo workspace builds these owners directly. Required source notices and license files stay with the integrated code.
The build uses these source owners directly; it does not create a separate compiler workspace or fetch a compiler toolchain during the build. bun lint, bun fmt, bun n2b and bun migrate dispatch to linked Rust implementations.
Validate changes with the affected owner tests and commands executed through bun bd. Source integration alone does not qualify a native runtime or release.