```ts
export function chunk<T>(items: readonly T[], size: number): T[][] {
  if (size <= 0) {
    throw new Error("Size must be a positive integer");
  }

  const result: T[][] = [];
  for (let i = 0; i < items.length; i += size) {
    if (i + size > items.length) {
      // Handle the remainder group
      result.push(items.slice(i));
    } else {
      result.push(items.slice(i, i + size));
    }
  }

  return result;
}
```