# JavaScriptAppResource.withYarn

- Module: [Aspire.Hosting.JavaScript](/reference/api/typescript/aspire.hosting.javascript.md)
- Defined on: [JavaScriptAppResource](/reference/api/typescript/aspire.hosting.javascript/javascriptappresource.md)
- Version: `13.4.0`
- Kind: `method`

Configures the Node.js resource to use yarn as the package manager and optionally installs packages before the application starts.

## Definition

```typescript
interface JavaScriptAppResource {
  // ... omitted for brevity
  withYarn(
      install?: boolean,
      installArgs?: string[]): JavaScriptAppResource;
}
```

## Signature

```typescript
withYarn(
    install?: boolean,
    installArgs?: string[]): JavaScriptAppResource
```

## Parameters

- `install` (`boolean`) `optional` `= True`
- `installArgs` (`string[]`) `optional`

## Returns

[JavaScriptAppResource](/reference/api/typescript/aspire.hosting.javascript/javascriptappresource.md) `builder`

## Defined on

- [JavaScriptAppResource](/reference/api/typescript/aspire.hosting.javascript/javascriptappresource.md) -- `handle`