Add a peer dependency

To add an npm package as a peer dependency, use the --peer flag.

bun add @types/bun --peer

This adds the package to peerDependencies in package.json.

{
  "peerDependencies": {
    "@types/bun": "^1.3.3" // [!code ++]
  }
}

bun install installs peer dependencies by default, unless they are marked optional in peerDependenciesMeta.

{
  "peerDependencies": {
    "@types/bun": "^1.3.3"
  },
  "peerDependenciesMeta": {
    "@types/bun": { // [!code ++]
      "optional": true // [!code ++]
    } // [!code ++]
  }
}

See bun install.