## ensureTrailingSlash() function  
Ensures the given URL has a trailing slash.

**Signature:**  
```typescript  
export declare function ensureTrailingSlash(url: string): string;  
```

## Parameters  
| Parameter | Type   | Description                                           |  
| --------- | ------ | ----------------------------------------------------- |  
| url      | string | The URL to ensure has a trailing slash.              |

**Returns:**  
string  
The URL with a trailing slash.