```ts
/**
 * The text, cut to limit characters with an ellipsis when it is longer.
 */
export function truncate(text: string, limit: number): string {
  if (!Number.isInteger(limit) || limit < 3) {
    throw new Error("Limit must be an integer of at least 3.");
  }
  
  if (text.length <= limit) {
    return text;
  }
  
  // Adjust for the ellipsis length
  const truncatedLength = Math.max(3, limit - 3);
  return text.slice(0, truncatedLength) + "...";
}
```