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

    const chunks: T[][] = [];

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

    return chunks;
}
```