Standalone binaries can now identify themselves (
7dd427e)
Bun now exposes Bun.isStandaloneExecutable, a read-only boolean that's true for bun build --compile outputs and false otherwise. The new API avoids forcing embedded files into Blobs, making it safe to check at startup in binaries with large bundled assets.
node:vm gets much closer to Node v26 parity (
0672e7d)
This commit vendors and fixes a large chunk of the node:vm test suite, pushing coverage to 97% (98/101). It also adds vm.measureMemory behavior, context tracking, and a batch of binding/runtime changes needed to match Node's semantics more closely.
JSX auto-imports no longer collide with local bindings (8d32bd4)
The parser now avoids aliasing automatic JSX runtime imports to a user's own local names like jsx, jsxs, jsxDEV, or Fragment. That fixes a runtime bug where Bun's injected import could shadow or be shadowed by a local variable and crash compiled output.
Source-map parsing gets a SIMD-backed fast path (c1da139)
Bun adds a Highway-based VLQ decoder for source-map mappings, along with benchmarks and platform allowlist updates. This should improve SourceMap parse throughput on large, bundler-shaped maps.
Recursive fs.cp regains the macOS clonefile fast path (765cad0)
Recursive fs.cp/cpSync/promises.cp now use a native whole-tree clonefile() path again on macOS when the tree only contains regular files and directories. Bun still falls back to the JS walker for symlinks and special files, preserving Node-compatible behavior while restoring speed for the common safe case.
CLI errors are now more actionable (fca03d9)
Several confusing CLI failures now print the bad value and better usage hints, including --linker, bun patch, bun patch-commit, --format, --define, --loader, and workspace filtering errors. These are quality-of-life fixes, but they make common mistakes much easier to recover from.