- Introduces Bun.Transpiler API for programmatic JavaScript/TypeScript/TSX transpilation, delivering 8‑15× speed gains over swc/esbuild and supporting simple macro plugins.
- Adds native implementations of many Node.js synchronous fs functions and expands Node.js process object support, including import.meta, queueMicrotask, and utilities like Bun.gc, Bun.shrink, and heap snapshot generation.
- Improves startup time, fixes regressions (including upgrade‑checker crash), and adds a fast, albeit incomplete, Jest‑like test runner subcommand.
Community impact
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