```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 = [] as T[][];
  for (let i = 0; i < items.length; i += size) {
    const slice = items.slice(i, Math.min(items.length, i + size));
    if (slice.length > 0) {
      result.push(slice);
    }
  }

  return result;
}
```