```ts
export function chunk<T>(items: readonly T[], size: number): T[][] {
    if (size < 1 || Number.isNaN(size) || typeof size !== 'number') {
        throw new Error('Size must be a positive integer');
    }
  
    const result = [];
    for (let i = 0; i < items.length; i += size) {
      result.push([...items].splice(i, size));
    }
    return result;
}
```