```ts
/** The text, cut to limit characters with an ellipsis when it is longer. */
export function truncate(text: string, limit: number): string {
  // Ensure limit is an integer of at least 3
  if (!Number.isInteger(limit) || limit < 3) {
    throw new Error("limit must be an integer of at least 3");
  }
  if (text.length < limit) {
    return text;
  }
  return text.slice(0, limit - 4) + "...";
}
```