input: from typing import Dict
  
  def generate_store_item(item_id: int, name: str, price: float, description: str) -> Dict:
      """ Generate a dictionary representing an online store item with fields for ID, name, price, and description.
      >>> generate_store_item(1, 'Laptop', 999.99, 'High performance laptop')
      {'item_id': 1, 'name': 'Laptop', 'price': 999.99, 'description': 'High performance laptop'}
      >>> generate_store_item(2, 'Smartphone', 499.99, 'Latest model smartphone')
      {'item_id': 2, 'name': 'Smartphone', 'price': 499.99, 'description': 'Latest model smartphone'}
      """
output:     return {'item_id': item_id, 'name': name, 'price': price, 'description': description}