```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 at least 3");
  return text.length <= limit ? text : `${text.slice(0, limit - 3)}...`;
}
```