## assertContextVersionOptional() function

**Signature:**

```typescript
export declare function assertContextVersionOptional(event: string): asserts event is FhircastEventVersionOptional;
```

## Parameters

| Parameter | Type | Description |
| --- | --- | --- |
| event | string |  |

**Returns:**

asserts event is [FhircastEventVersionOptional](/content/docs/sdk/core.fhircasteventversionoptional)