# runAsPreviewEmulator

- Module: [Aspire.Hosting.Azure.CosmosDB](/reference/api/typescript/aspire.hosting.azure.cosmosdb.md)
- Version: `13.4.0`
- Kind: `method`
- Source: [GitHub](https://github.com/microsoft/aspire)

Configures the Azure Cosmos DB resource to run using the preview emulator

## Definition

```typescript
interface AzureCosmosDBResource {
  // ... omitted for brevity
  runAsPreviewEmulator(configureContainer?: (obj: AzureCosmosDBEmulatorResource) => Promise<void>): AzureCosmosDBResource
}
```

## Parameters

- `configureContainer` (`(obj: AzureCosmosDBEmulatorResource) => Promise<void>`) `optional`

## Returns

[AzureCosmosDBResource](/reference/api/typescript/aspire.hosting.azure.cosmosdb/azurecosmosdbresource.md) `builder`

## Applies to

- [AzureCosmosDBResource](/reference/api/typescript/aspire.hosting.azure.cosmosdb/azurecosmosdbresource.md)