How do headless-ui expose context variable for child components?

import { Menu } from '@headlessui/react'

function MyDropdown() {
  return (
    <Menu>
      {({ open }) => (
        <>
          <Menu.Button>More</Menu.Button>
          {open && (
            <div>
              <Menu.Items static>
                <Menu.Item>{/* ... */}</Menu.Item>
                {/* ... */}
              </Menu.Items>
            </div>
          )}
        </>
      )}
    </Menu>
  )
}