```ts
/**
 * Splits an array into consecutive groups of at most specified size elements.
 * The final group is shorter if the length does not divide evenly.
 *
 * @param items - The array to be split.
 * @param size - The maximum number of elements in each chunk.
 * @returns An array of chunks, where each chunk is a subarray of the input array.
 */
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) {
    result.push(items.slice(i, Math.min(i + size, items.length)));
  }
  return result;
}
```