input: 
  def generate_store_item_class() -> str:
      """Generate a Python class for an online store item that includes fields for ID, name, price, and description.
      
      Example:
      >>> test_item = generate_store_item_class()
      >>> item = test_item('123', 'Laptop', 999.99, 'A powerful laptop for everyday use.')
      >>> print(item)
      'Laptop, $999.99'
      >>> item.to_dict()
      {'item_id': '123', 'name': 'Laptop', 'price': 999.99, 'description': 'A powerful laptop for everyday use.'}
      """
  
output:     
      class StoreItem:
          def __init__(self, item_id: str, name: str, price: float, description: str):
              self.item_id = item_id
              self.name = name
              self.price = price
              self.description = description
  
          def __str__(self):
              return f"{self.name}, ${self.price:.2f}"
  
          def to_dict(self):
              return {
                  'item_id': self.item_id,
                  'name': self.name,
                  'price': self.price,
                  'description': self.description
              }
  
      return StoreItem
  