## isReference() function
Type guard to validate that an object is a FHIR reference

**Signature:**

```typescript
export declare function isReference<T extends Resource = Resource>(value: unknown, resourceType?: T['resourceType']): value is Reference<T> & {
    reference: string;
};
```

## Parameters

| Parameter   | Type               | Description                                                                           |
|-------------|--------------------|---------------------------------------------------------------------------------------|
| value       | unknown            | The object to check                                                                   |
| resourceType| T['resourceType']  | _(Optional)_ Checks that the reference is of the given type                           |

**Returns:**

value is Reference<T> & { reference: string; }

True if the input is of type 'object' and contains property 'reference'

- [isReference() function](/content/docs/sdk/core.isreference#isreference-function/index.html)  
- [Parameters](/content/docs/sdk/core.isreference#parameters/index.html)