Bun Runtime

Bun is a fast JavaScript runtime that also handles package management, bundling, and testing in one toolkit. It's a drop-in Node replacement built on JavaScriptCore, and the install speeds really are noticeably faster. Reach for it on new projects where you want a unified toolchain, or when you're deploying to Vercel with Bun runtime support. The skill covers migration from Node (mostly just swap `node` for `bun run`), the difference between text and binary lockfiles across versions, and Bun-specific APIs like the native file reader and HTTP server. Stick with Node if you need maximum ecosystem compatibility or have dependencies with known Bun issues.

skills.sh installs: 4.9K
GitHub stars: 229.1K
last updated: Jul 14, 2026

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Install

$ npx -y skills add affaan-m/everything-claude-code --skill bun-runtime --agent claude-code

Installs into .claude/skills of the current project.

Files

Bun Runtime

Bun is a fast all-in-one JavaScript runtime and toolkit: runtime, package manager, bundler, and test runner.

When to Use

Prefer Bun for: new JS/TS projects, scripts where install/run speed matters, Vercel deployments with Bun runtime, and when you want a single toolchain (run + install + test + build).
Prefer Node for: maximum ecosystem compatibility, legacy tooling that assumes Node, or when a dependency has known Bun issues.

Use when: adopting Bun, migrating from Node, writing or debugging Bun scripts/tests, or configuring Bun on Vercel or other platforms.