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Bun Package Manager

tessl install https://github.com/secondsky/claude-skills --skill Bun Package Manager

github.com/secondsky/claude-skills

Bun package manager commands (install, add, remove, update), workspaces, lockfiles, npm/yarn/pnpm migration. Use for dependency management with Bun.

Review Score

16%

Validation Score

10/16

Implementation Score

Activation Score

Bun Package Manager

Bun's package manager is a dramatically faster replacement for npm, yarn, and pnpm. Up to 25x faster than npm install.

Quick Start

# Install all dependencies
bun install

# Add packages
bun add react react-dom
bun add -D typescript @types/react

# Remove packages
bun remove lodash

# Update packages
bun update

# Run package binaries
bunx create-next-app

Core Commands

Command	Description
`bun install`	Install all dependencies
`bun add <pkg>`	Add dependency
`bun add -D <pkg>`	Add dev dependency
`bun add -O <pkg>`	Add optional dependency
`bun add --peer <pkg>`	Add peer dependency
`bun remove <pkg>`	Remove dependency
`bun update [pkg]`	Update dependencies
`bunx <pkg>`	Run package binary
`bun pm cache rm`	Clear cache

Installation Flags

# Production mode (no devDependencies)
bun install --production

# Frozen lockfile (CI/CD)
bun install --frozen-lockfile
bun ci  # shorthand

# Dry run
bun install --dry-run

# Verbose/Silent
bun install --verbose
bun install --silent

# Force reinstall
bun install --force

# Global packages
bun install -g cowsay

Lockfile

Bun uses bun.lock (text-based since v1.2):

# Generate text lockfile
bun install --save-text-lockfile

# Upgrade from binary bun.lockb
bun install --save-text-lockfile --frozen-lockfile --lockfile-only
rm bun.lockb

Workspaces (Monorepos)

{
  "name": "my-monorepo",
  "workspaces": ["packages/*", "apps/*"]
}

Run commands across workspaces:

# Run in matching packages
bun run --filter 'pkg-*' build

# Run in all workspaces
bun run --filter '*' test

# Install for specific packages
bun install --filter 'pkg-a'

Lifecycle Scripts

Bun does not run lifecycle scripts from dependencies by default (security). Whitelist trusted packages:

{
  "trustedDependencies": ["my-trusted-package"]
}

# Skip all lifecycle scripts
bun install --ignore-scripts

# Concurrent scripts
bun install --concurrent-scripts 5

Overrides & Resolutions

Force specific versions for nested dependencies:

{
  "overrides": {
    "lodash": "4.17.21"
  }
}

Yarn-style resolutions also supported:

{
  "resolutions": {
    "lodash": "4.17.21"
  }
}

Non-npm Dependencies

{
  "dependencies": {
    "dayjs": "git+https://github.com/iamkun/dayjs.git",
    "lodash": "git+ssh://github.com/lodash/lodash.git#4.17.21",
    "zod": "github:colinhacks/zod",
    "react": "https://registry.npmjs.org/react/-/react-18.2.0.tgz",
    "bun-types": "npm:@types/bun"
  }
}

Installation Strategies

Hoisted (default for single packages)

Traditional flat node_modules:

bun install --linker hoisted

Isolated (default for workspaces)

pnpm-like strict isolation:

bun install --linker isolated

Isolated prevents "phantom dependencies" - packages can only access declared dependencies.

CI/CD

# GitHub Actions
- uses: oven-sh/setup-bun@v2
- run: bun ci  # frozen lockfile

Platform-Specific

# Install for different platform
bun install --cpu=x64 --os=linux

Common Errors

Error	Cause	Fix
`Cannot find module`	Missing dependency	Run `bun install`
`Lockfile mismatch`	package.json changed	Run `bun install`
`Peer dependency`	Missing peer	`bun add` the peer
`Lifecycle script failed`	Untrusted package	Add to `trustedDependencies`

Migration from Other Package Managers

From pnpm

Bun automatically migrates pnpm-lock.yaml:

bun install  # Auto-converts to bun.lock

Workspace config moves to package.json:

{
  "workspaces": {
    "packages": ["apps/*", "packages/*"],
    "catalog": {
      "react": "^18.0.0"
    }
  }
}

From npm/Yarn

Simply run bun install - Bun reads package-lock.json and yarn.lock.

When to Load References

Load references/cli-commands.md when:

Need complete CLI flag reference
Working with advanced options

Load references/workspaces.md when:

Setting up monorepos
Configuring workspace filters

Load references/migration.md when:

Migrating from npm/yarn/pnpm
Converting lockfiles