Bun in 100 Seconds

Fireship covers Bun, the all-in-one JavaScript runtime that replaces Node, npm, Webpack, Babel, and test runners from a single binary.

• Bun swaps Node’s V8 engine for JavaScriptCore (Safari’s engine) and rewrites core in Zig instead of C++.
• Bun is a single binary replacing runtime, bundler, package manager, test runner, and config tooling.
• Bun install is claimed to be 25x faster than npm install.
• Built-in drivers for SQLite, Redis, and S3 — no third-party dependencies needed.
• Powers Claude Code and serverless functions on major cloud platforms as of early 2026.
• TypeScript runs natively with no transpiler config required.
• Built-in test runner and –watch flag for auto-restart, no extra tooling needed.

2026-01-22 · Watch on YouTube