```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");
  }

  const textLength = text.length;
  if (textLength <= limit) {
    return text;
  }
  return text.slice(0, limit - 3) + "...";
}
```