# DurableTaskSchedulerResource.runAsExisting

- Module: [Aspire.Hosting.Azure.Functions](/reference/api/typescript/aspire.hosting.azure.functions.md)
- Defined on: [DurableTaskSchedulerResource](/reference/api/typescript/aspire.hosting.azure.functions/durabletaskschedulerresource.md)
- Version: `13.4.0`
- Kind: `method`

Configures the Durable Task scheduler to use an existing scheduler instance from a connection string or parameter resource.

## Definition

```typescript
interface DurableTaskSchedulerResource {
  // ... omitted for brevity
  runAsExisting(connectionString: ParameterResource): DurableTaskSchedulerResource;
}
```

## Signature

```typescript
runAsExisting(connectionString: ParameterResource): DurableTaskSchedulerResource
```

## Parameters

- `connectionString` (`ParameterResource`)

## Returns

[DurableTaskSchedulerResource](/reference/api/typescript/aspire.hosting.azure.functions/durabletaskschedulerresource.md) `builder`

## Defined on

- [DurableTaskSchedulerResource](/reference/api/typescript/aspire.hosting.azure.functions/durabletaskschedulerresource.md) -- `handle`