<h1>Bun’s New Text-Based Lockfile and Latest Updates in Versions 1.1.39 and 1.1.40</h1>
<h2>Introduction</h2>
<p>Bun, the modern JavaScript runtime, has recently introduced a series of updates across its latest versions, v1.1.39 and v1.1.40. These updates bring notable improvements including a new text-based lockfile format, significant performance optimizations, and several bug fixes. Let’s delve into the latest changes and enhancements.</p>
<h2>Bun v1.1.39 Highlights</h2>
<p><strong>1. New Text-Based Lockfile Format:</strong></p>
<ul>
<li>Bun v1.1.39 has introduced a text-based lockfile format known as <code>bun.lock</code>.</li>
<li>This new format will become the default in Bun v1.2.</li>
<li>It significantly improves the speed of the <code>bun install</code> command by 30% compared to the previous binary lockfile.</li>
<li>The text-based format is easier to review and handle in version control, making it a developer-friendly update.</li>
</ul>
<p><strong>2. Performance Enhancements:</strong></p>
<ul>
<li>The update ensures various optimizations such as avoiding O(N^3) memory allocations and leveraging specific system calls to maintain high performance.</li>
</ul>
<p><strong>3. Comprehensive Updates:</strong></p>
<ul>
<li>Bun v1.1.39 includes support for <code>fetch()</code> request body streams, aiming for full Node.js compatibility by fixing bugs and passing all tests for several Node.js modules.</li>
<li>Enhancements in the WebSocket server and a new native plugin API for Bun.build.</li>
<li>Improvements in memory profiling, and internal dependencies like WebKit are upgraded.</li>
<li>Introduced new functionalities like <code>Error.isError</code> and faster <code>String.prototype.at</code>.</li>
</ul>
<h2>Bun v1.1.40 Improvements</h2>
<p><strong>1. Bug Fixes and Enhancements:</strong></p>
<ul>
<li>A total of 14 bugs were fixed in v1.1.40, addressing various issues that improve the overall stability and performance of the runtime.</li>
<li>Resolved issues with package-lock.json migration when using git URLs.</li>
<li>Addressed a regression in <code>process.on</code> introduced in the previous version.</li>
</ul>
<p><strong>2. Default Option for Text Lockfiles:</strong></p>
<ul>
<li>v1.1.40 added a new option to save text lockfiles as the default.</li>
</ul>
<p><strong>3. Security and Reliability Upgrades:</strong></p>
<ul>
<li>WebKit upgrades for enhanced security and reliability.</li>
<li>Improvements in the installation process for git/github dependencies.</li>
</ul>
<h2>Conclusion</h2>
<p>The recent updates in Bun v1.1.39 and v1.1.40 underscore the commitment to improving performance, compatibility, and developer experience. The introduction of the new text-based lockfile format and the series of performance enhancements highlight Bun’s ongoing evolution as a powerful JavaScript runtime. Developers can look forward to even more efficient workflows and seamless integrations with future updates.</p>


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Bun has released updates in versions 1.1.39 and 1.1.40, introducing a new text-based lockfile format, performance optimizations, bug fixes, and various enhancements. The text-based lockfile improves `bun install` command speed by 30%, facilitates easier version control handling, and will be the default in Bun v1.2. Other improvements include full Node.js compatibility, WebSocket server enhancements, memory profiling improvements, and security updates.

Bun v1.1.39: New Text-Based Lockfile and Performance Enhancements