Bun

Description: Bun is an all-in-one toolkit for developing modern JavaScript/TypeScript applications. Docs: https://bun.com/docs

Tags: npm

Collections: Useful to remember

What Bun is

• Bun is an all-in-one toolchain: runtime, bundler, test runner, and package manager.
• In contrast, npm is only a package manager that pairs with Node.js.

Performance

• Speed: Bun installs packages 5–20x faster than npm.
• Example: Cold installs of large projects that take ~40 seconds with npm can complete in under 5 seconds with Bun (source: DEV Community).

Registry Compatibility

• Bun is fully compatible with the npm registry; you can install any package you would normally use with npm.
• You won’t lose access to any packages.

Architecture: All-in-One vs. Single Purpose

• Bun: built-in runtime, bundler, and test runner.
• npm: manages packages; requires Node.js to run code, and separate tools for bundling/testing.

Maturity & Stability

• npm: very stable and mature; tutorials, docs, and CI/CD pipelines widely support npm by default.
• Bun: ~98% npm compatibility, but some native modules may still have issues.

TypeScript Support

• Bun can execute TypeScript directly (bun run index.ts) with no extra config or compilation step.
• npm requires a separate TypeScript setup.

TL;DR

• Speed: Bun 5–20x faster; npm slower.
• Runtime: Bun includes a built-in runtime; npm relies on Node.js.
• Bundler/Test Runner: Bun has built-in bundler and test runner; npm uses separate tools.
• Compatibility: Bun ~98% npm-compatible; some native module issues possible.
• TypeScript: Bun runs TS directly; npm needs additional config.