```ts
/**
 * Splits an array into consecutive groups of at most size elements.
 *
 * @param items - The array to be chunked.
 * @param size - The maximum size of each chunk.
 * @returns An array of chunks.
 */
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)
      )
    : [];
}
```