```ts
function chunk<T>(items: readonly T[], size: number): T[][] {
  if (size < 1) {
    throw new Error('Size must be greater than zero');
  }

  const result: T[][] = [];
  let currentGroup: T[] = [];

  for (const item of items) {
    currentGroup.push(item);
    if (currentGroup.length === size || items.indexOf(item) === items.length - 1) {
      result.push(currentGroup);
      currentGroup = [];
    }
  }

  return result;
}
```