YAML block scalars now parse indentation and chomping correctly (
303e97a)
Bun.YAML now honors explicit block-scalar indent indicators (|1..|9 / >1..>9) instead of dropping them, and fixes chomping/folding behavior at EOF and across more-indented lines. This closes multiple conformance gaps in block scalar handling and should make YAML output match the spec and other parsers more reliably.
Bundler closes the main-thread performance gap (
32a161f)
The bundler was reworked to cut main-thread serialization overhead in the parse/link pipeline, with the branch measured faster than Zig 1.3.14 on large rolldown benchmarks. This is a meaningful throughput win for large projects and reduces the cost of bundling hot paths.
Escape-sequence diagnostics now point at the right character (
71b4baa)
The lexer fixes off-by-one position math in invalid escape handling so carets land on the backslash instead of drifting left, especially for out-of-range \u{...} errors. That makes parse errors much easier to understand and fixes a user-visible regression in syntax diagnostics.
Buffer ASCII writes now preserve high-bit bytes (02f9249)
Buffer.write(..., "ascii") is aligned with Node’s behavior by treating ASCII writes as Latin-1 byte-preserving encodes instead of masking to 7 bits. This fixes data corruption for bytes 0x80–0xFF and brings write(), fill(), and alloc() string fills into parity.
Top-level await is preserved across isolated/preloaded test runs (2f9e77b)
The test runner now carries TLA metadata through the runtime transpiler cache and module record path, fixing preloads that could resolve before their async setup finished under --isolate / --parallel. This was a real ordering bug that could make tests observe unset preload state.
FileSink flush failures now leave the sink marked done (3eb0fda)
When FileSink::end() fails while flushing buffered data, the sink now marks itself done instead of leaving dangling state that can later write to Fd::INVALID. That prevents follow-up writes/flushes and avoids assertion failures after an earlier I/O error.
ReadableStream reuses its pull buffer instead of reallocating each read (
a43a01b)
Native ReadableStream no longer rotates a fresh buffer on every small pull; it keeps reusing the tail of the existing backing allocation. This avoids pathological memory growth and commit-charge spikes during streaming reads, especially on Windows.
Shell brace + glob patterns are globbed correctly (
b3d086e)
Shell expansion now applies globbing after brace expansion instead of silently dropping patterns like src/*.{ts,tsx}. This fixes a user-facing shell bug that previously produced wrong no-op behavior with exit code 0.
Signal errors list the actual valid names (b916187)
subprocess.kill("BADSIGNAL") now reports the full canonical list of valid signals again instead of a placeholder message. This restores a useful error string and matches released Bun behavior.
Bundled wrapper names handle non-ASCII filenames correctly (f5358e2)
The identifier formatter now decodes multi-byte code points instead of treating each UTF-8 byte as a separate character, fixing generated CommonJS wrapper symbols for filenames like café-utils.js. That removes the extra underscore and keeps bundle output stable for non-ASCII paths.
bun_sys::File and bun_sys::Dir now own their fds (46b2404)
Core file and directory handles were converted into RAII-owned types that close on Drop, eliminating an entire class of silent descriptor leaks. The change also propagates through install, bundler, cache, and filesystem code paths that previously depended on manual closes.
Dev server directory watches no longer keep dangling paths (a55a62d)
The live DirectoryWatchStore insert path was fixed to stop storing borrowed path data that could outlive its backing allocation. This removes a real use-after-free risk in the dev server’s watcher bookkeeping.
mimalloc was bumped to a build with a TLS sentinel fix (be6a3c5)
The dependency update pulls in a mimalloc fix for a flaky crash in the transpiler worker pool caused by a bad sentinel value during heap initialization. This is a targeted stability update rather than a broad dependency refresh.
Clippy deny-lint rollout and workspace cleanup (21db682)
A large linting pass added deny-level clippy rules and fixed thousands of violations across the workspace, including a sizable dead-code reduction. This is mostly internal hygiene and should improve long-term code health, but it’s not a product feature change.
Other misc changes
- Transpiler cache version bump and preload cache serialization fix for TLA metadata.
- YAML conformance follow-up for
JEF9/02trailing indentation behavior. - ReadableStream leak test coverage added.
- Workspace-wide refactors and internal allocation/type plumbing tied to the clippy cleanup and bundler performance work.