> ## Documentation Index
> Fetch the complete documentation index at: https://bun.ll1025.cn/llms.txt
> Use this file to discover all available pages before exploring further.

# Add a peer dependency

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

```sh terminal icon="terminal" theme={null}
bun add @types/bun --peer
```

***

This adds the package to `peerDependencies` in `package.json`.

```json package.json icon="file-json" theme={null}
{
  "peerDependencies": {
    "@types/bun": "^1.3.3" // [!code ++]
  }
}
```

***

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

```json package.json icon="file-json" theme={null}
{
  "peerDependencies": {
    "@types/bun": "^1.3.3"
  },
  "peerDependenciesMeta": {
    "@types/bun": { // [!code ++]
      "optional": true // [!code ++]
    } // [!code ++]
  }
}
```

***

See [`bun install`](/pm/cli/install).