Rolldown 1.2.5

The Rolldown team released version 1.2.5 on August 19, 2026, the latest patch in the Rust-based bundler's steady cadence of fixes. The release tightens code-splitting behavior, improves Windows-friendly output, and adds new platform support and a re-export safety warning.

What Changed

The headline additions are a new NAMESPACE_CONFLICT warning for conflicting star re-exports and an allocation-tracking global allocator behind the tracking_allocator feature, aimed at memory debugging. The build now also supports armv7-linux-androideabi targets.

On the fixes side, the Vite reporter no longer emits ANSI erase-line escape sequences in non-TTY output, Yarn PnP virtual importers are preserved during resolution, and case-insensitive filename deconfliction now skips hash placeholders. Code-splitting folds already-loaded side-effectful libraries into eager entries, and the dev server flushes re-emitted assets when their content changes.

Why It Matters

For teams running Rolldown as the bundler behind Vite or in standalone builds, 1.2.5 is primarily a quality-of-life patch — cleaner CI logs, more accurate warnings about ambiguous re-exports, and fewer silent failures around asset regeneration in dev.

What's Next

The release also bumps the underlying oxc parser to 0.146.0 alongside routine dependency updates, keeping Rolldown aligned with the broader oxc toolchain. No breaking changes were introduced.