```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;
  }

  const ellipsisIndex = Math.max(0, limit - 6);
  return text.slice(0, ellipsisIndex) + "...";
}
```