```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' || limit < 3) {
    throw new Error("limit must be an integer of at least 3");
  }
  const truncatedText = text.length > limit ? `${text.slice(0, limit - 4)}...` : text;
  return truncatedText;
}
```