```ts
export function chunk<T>(items: readonly T[], size: number): T[][] {
    if (!Number.isInteger(size) || size <= 0) {
        throw new Error("Size must be a positive integer");
    }
    return items.length > 0 ? Array.from({ length: Math.ceil(items.length / size) }, (_, i) => items.slice(i * size, (i + 1) * size)) : [];
}
```