```typescript
/** The text, cut to limit characters with an ellipsis when it is longer. */
export function truncate(text: string, limit: number): string {
  if (typeof limit !== 'number' || limit < 3) {
    throw new Error('Limit must be an integer at least 3');
  }
  return text.length <= limit ? text : text.slice(0, limit - 2) + '...';
}
```