Standard decorators now lower without reordering class members (
a22b2aa)
Bun’s decorator transform no longer moves decorated fields, static blocks, or decorator lists out of the class body. That preserves this/lexical context and member execution order, fixing incorrect runtime behavior for standard decorators and bare accessors.
mock.module() now patches loaded modules after async factories resolve (
09bb546)
If a module is already imported and the mock factory returns a pending promise, Bun now updates the existing module exports when that promise settles instead of spinning forever. The API now returns a promise in that case, which makes async module mocking usable without hanging test runs.
Error printing no longer crashes on error.code String objects (051e39c)
Bun now only treats error.code as a printable code when it’s a primitive string, avoiding String objects that can throw or abort during inspection. This fixes crashes in Bun.inspect(), console.error(), uncaught throws, and unhandled rejections.
HTTP/2 fetch avoids freeing a stream twice on terminal callbacks (0cbeffd)
The HTTP/2 client now keeps streams alive through a re-entrant deliver loop when a terminal callback closes the session, preventing a use-after-free. This is a direct memory-safety fix for ASAN-reported heap corruption during fetch() over h2.
Native-locked readable streams are closed or errored when their sink ends (f04caca)
Bun now tracks the stream locked by a native sink and ends it when that sink detaches, instead of leaving the stream hanging open. That tightens lifecycle handling for byte streams, file readers, and other native-backed readable streams.
Mimalloc is bumped and purge behavior is corrected (3f7f046)
Bun updates its mimalloc fork and adds tests for forced purges waiting on an in-progress pass, plus purging memory freed during a pass on the next cycle. The change also keeps startup working with smaller JSC structure-heap reservations by enabling pagemap-backed frees.
Other misc changes
- Documented the new async
mock.module()behavior. - Added TypeScript typings for
mock.module()returning a promise in the pending-factory case. - Expanded test coverage for the decorator transform, error printing, HTTP/2 fetch, streams, and mimalloc integration.