```ts
export function chunk<T>(items: readonly T[], size: number): T[][] | void {
  if (size <= 0) {
    throw new Error('Size must be a positive integer');
  } else if (items.length === 0) {
    return [];
  }

  const result: any[] = [];

  for (let i = 0; i < items.length; i += size) {
    const group = items.slice(i, Math.min(i + size, items.length));
    result.push(group);
  }

  return result;
}
```