# IDistributedApplicationBuilder.tryAddEventingSubscriber

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

Attempts to add an ATS-friendly eventing subscriber callback to the distributed-application builder.

## Definition

```typescript
interface IDistributedApplicationBuilder {
  // ... omitted for brevity
  tryAddEventingSubscriber(subscribe: (arg: EventingSubscriberRegistrationContext) => Promise<void>): void;
}
```

## Signature

```typescript
tryAddEventingSubscriber(subscribe: (arg: EventingSubscriberRegistrationContext) => Promise<void>): void
```

## Parameters

- `subscribe` (`(arg: EventingSubscriberRegistrationContext) => Promise<void>`)

## Defined on

- [IDistributedApplicationBuilder](/reference/api/typescript/aspire.hosting/idistributedapplicationbuilder.md) -- `interface`