```ts
/** 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' || number.isNaN(limit) | limit < 3) {
    throw new Error("limit must be an integer of at least 3");
  }
  const cutText = text.slice(0, limit);
  return cutText.length === text.length ? cutText : cutText + "...";
}
```