RUNTIME

A solo developer built a complete JavaScript ecosystem from scratch - runtime, engine, package manager, and Electron alternative. Here's what HN thinks.

TypeScript-first schema validation. Define schemas once, get static types and runtime validation. The default validator for tRPC, Next.js server actions, and AI SDKs.

All-in-one JavaScript runtime, bundler, test runner, and package manager. Rewritten in Rust as of Bun 1.4 (August 2026), drop-in compatible with Node, dramatically faster install and start times.

The original server-side JavaScript runtime. V8 under the hood, npm ecosystem, and the default backend runtime for most production deployments.

Secure-by-default JavaScript and TypeScript runtime from Node's original creator, with built-in TypeScript, fmt, lint, and test. The Deno team joined Cloudflare in October 2026: the runtime gets one more year of bug-fix and security releases, and Deno Deploy shuts down six months after the announcement.