Bun adds native tooling, Bake expansion, and big runtime fixes

Native developer tooling lands in Bun

bun lint and bun format go native — Bun now ships first-class linting and formatting commands with config discovery, plugin loading, Svelte formatting, and tighter parity with ESLint/Prettier-style workflows. Type-aware lint and checker parity improve — bun lint --type-aware reduced duplicate diagnostics and gained broader rule parity, while bun check fixed several TypeScript mismatches, hangs, and generics/loop edge cases. Formatter internals were overhauled — Comment ownership was rewritten to match Prettier’s model, and CSS minification/formatting correctness improved along the way.

Bake, install, and package-manager behavior evolve

Bake expanded from simple app pages to frameworks and routes — bun bake now supports .tsx/.jsx pages, bake.config.ts, framework plugins, hot reload, and config-driven routing, making it much closer to a real app framework layer. Install compatibility improved across ecosystems — Bun added Yarn Berry lockfile migration, better frozen-lockfile semantics, and pnpm-style symlink handling, while also clarifying peer dependency and lockfile behavior. Package-manager work was consolidated for Bun 1.5 — A large merge pulled hundreds of open PM changes into a single reviewed update, tightening docs, completions, and lockfile plumbing.

Runtime correctness and performance got a broad pass

Network and event-loop bugs were fixed — TLS/HTTPS send-path issues, socket fairness starvation, HTTP/2 hangs, WebSocket proxy renegotiation, and DOM constructor side-effect ordering were all addressed. Core APIs became safer and more Node-compatible — Fixes landed for Bun.JSONL, Bun.YAML.parse, TextEncoder.encode, fs.realpath, diagnostics_channel, util.inspect, Headers iteration, and Windows env inheritance. Performance work trimmed overhead — Native stream readers allocate more precisely, bun check sped up Windows directory listing, headers iteration got cheaper, and compile-cache writes dropped a bytecode optimizer pass.

SQL, WebSocket, and bindgen saw major consolidation

SQL APIs were unified and hardened — Bun.sql, bun:sqlite, and node:sqlite were consolidated, with better transaction/error handling and a new DATABASE_URL default. WebSocket support was overhauled — Global WebSocket, Bun.serve({ websocket }), and the ws package were aligned around a native transport with updated docs and closing-handshake behavior. Bindgen became the default path for more native APIs — A unified generator now handles more functions, classes, argument models, and schema-driven bindings, reducing manual parsing across core.

Other misc changes

• Linux arm64 startup crash fixed when kernels misreport SVE2.
• --disallow-code-generation-from-strings=strict was tightened and documented.
• CI image inputs are now pinned by checksum.
• Numerous docs, completion updates, flaky-test fixes, and internal refactors across lint, check, fmt, Bake, and install.