Show HN: Meow – The 4th and final JavaScript runtime and toolchain

Show HN: Meow – The 4th and final JavaScript runtime and toolchain

One binary replaces your runtime, package manager, test runner, linter, formatter and typechecker. Your package.json stays. Your code stays. Everything just runs faster - with tiny paws.

Instead of forcing your runtime, package manager, linter and test runner to parse your codebase independently over and over, meow brings them under a single roof. Powered by the ultra-fast Oxc parser, we map your code exactly once in memory. That single AST natively feeds the entire toolchain at once.

your_codebase/ parsed once · fed everywhere

Packages download to a global cache exactly once, then instantly project into your workspace. Millisecond warm installs and 0 bytes of duplicated disk space. No need to rewrite imports or fix configs.

meow natively boots Next.js 15, Astro and Vite out of the box - seamless CommonJS & Node built-in compatibility.

We don't skip cryptographic supply-chain signatures to win benchmarks. meow runs full SHA-512 verification, offloading heavy hashing to background OS threads so your network never stalls.

The clock is frozen and randomness is seeded so test environments are mathematically predictable every single run. Need real network or file access? Just pass --trust.

The JavaScript ecosystem doesn't need another competing standard - it needs unification. meow doesn't reinvent the wheel. We proudly leverage the hardened, cross-platform runtime abstractions engineered by the Deno team and marry them to Oxc's lightning-fast parsing pipeline - connective tissue that turns isolated, fragmented tools into a secure-by-default sandbox.

MEOW_DANGEROUSLY_DISABLE_SECURITY=1 → leash off 🐾

Performance

meow runs full SHA-512 supply-chain verification on every install - and still projects a 516-package workspace from cache in 301ms. On real Next.js 15 builds it leaves Node and Deno in the dust, and trades blows with the fastest runtimes on raw compute. On the work you actually ship, the claws come out.

• 3 iterations · ~25+ pkg full-stack Next.js / Prisma workspace · real numbers, no shortcuts
• Warm install 516 pkgs from cache · SHA-512 verified
• Hot install instant no-op re-install
• File I/O 300-file read + write
• Cold start ahead of Node & Deno lower is better · 516 packages · 2174 edges

Global cache warm. 516 packages projected into place in 301ms, every signature SHA-512 verified along the way.