Fixes 103 issues (addressing 172 👍). 2× faster bun build on macOS for symlink-heavy projects, source maps preserve legal comments, and --format=cjs now inlines import.meta; bun test adds global vi, --pass-with-no-tests, and --only-failures; .npmrc :email auth support, faster installs when no peer deps, selective hoisting for isolated installs (publicHoistPattern/hoistPattern), and fs/promises FileHandle.readLines(); numerous bundler/transpiler fixes (external sourcemaps in Bun.build({ compile:true }), --bytecode with import.meta, Windows react-jsxdev); reliability fixes across install/pm/pack, bunx, Node.js compatibility improvements, and numerous bug fixes.

Bun is a platform offering insights, tutorials, and resources for software developers and technology enthusiasts. From this source readers can learn about programming languages, frameworks, and development tools. With articles, tutorials, and code samples, Bun provides  guidance and expertise for building software applications and exploring new technologies.

Bun v1.3.1 fixes 103 issues with significant performance and feature improvements. Key updates include 2× faster builds on macOS for symlink-heavy projects, source maps preserving legal comments, and CommonJS format now inlining import.meta. The test runner adds Vitest's global vi, --pass-with-no-tests and --only-failures flags. Package management improvements include .npmrc email authentication support, faster installs without peer dependencies, and selective hoisting via publicHoistPattern/hoistPattern for isolated installs. Node.js compatibility enhancements include FileHandle.readLines() in fs/promises. Numerous bundler, transpiler, WebSocket, MySQL, and Windows-specific bugs are resolved.

Bun v1.3.1

<p>I’m really impressed by how quickly Bun is developing. From the start, Jarred Sumner said his goal was to build something like a “Ruby on Rails for JavaScript,” and it’s exciting to see that vision taking shape. Features like native S3 integration show Bun growing beyond speed into a complete, elegant development platform. If the team keeps this pace, it could redefine how we build modern web apps.</p>


<p>I really like Bun approach to development: it adds new things to nodejs world, especially performance, but not forces me to refactor the whole sourcecode I have in existing project, to be able to run the app. In Deno, I was forced to change all imports in my codebase to include extension, and remove barrel imports, which are great feature to me. That’s why I dropped deno in favor of Bun.</p>
