Fixes 120 issues (addressing 219 👍). Render Markdown in the terminal with bun ./file.md, Bun.WebView headless browser automation, in-process Bun.cron() scheduler, async stack traces for native errors, 2.3x faster URLPattern, 2x faster Bun.Glob.scan, cgroup-aware parallelism on Linux, and many bugfixes and Node.js compatibility improvements.

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 v1.3.12 ships with a large set of new features and bugfixes. Highlights include native headless browser automation via Bun.WebView (WebKit and Chrome backends), terminal Markdown rendering with `bun ./file.md`, an in-process Bun.cron() scheduler, async stack traces for native errors, 2.3x faster URLPattern, 2x faster Bun.Glob.scan, cgroup-aware parallelism on Linux, TCP_DEFER_ACCEPT for Bun.serve(), HTTPS proxy CONNECT tunnel reuse, SIMD-optimized ANSI string utilities, upgraded JavaScriptCore engine with explicit resource management support, and over 120 bug fixes covering Node.js compatibility, memory leaks, crashes, and security issues.

Bun v1.3.12

Bun.WebView — Headless Browser Automation

Render Markdown in the Terminal with bun ./file.md

UDP Socket: ICMP Error Handling and Truncation Detection

Unix Domain Socket Lifecycle Now Matches Node.js

Cgroup-aware availableParallelism / hardwareConcurrency on Linux

Keep-Alive for HTTPS Proxy CONNECT Tunnels

TCP_DEFER_ACCEPT for Bun.serve() on Linux