```ts
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;
  }

  return text.slice(0, limit - 4) + "...";
}
```