Bun Releases 1.39 Adding Concurrent Script Execution
Bun has released version 1.39 following its recent acquisition by Anthropic, and the update is available now. The release adds Foreman-style prefixed output to run multiple package.json scripts concurrently or sequentially, SIMD-accelerated Markdown-to-HTML rendering with 3–15% throughput gains, plus Bun.Archive and Bun.JSONC.parse APIs. The project remains open-source under the MIT license and continues focusing on performance and Node.js compatibility.
Key Points
- 1Adds concurrent and sequential package.json script execution with Foreman-style prefixes and workspace filtering support.
- 2Improves Markdown rendering using SIMD-accelerated scanning, delivering 3–15% faster throughput on many documents.
- 3Provides built-in Bun.Archive and Bun.JSONC.parse APIs, enabling faster tar handling and JSONC parsing in JavaScript.
Scoring Rationale
Official release delivers practical developer features and measurable performance gains, but represents incremental tooling improvement rather than paradigm shift.
Sources
Public references used for this report.
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