text: import React from 'react'
  import PropTypes from 'prop-types'
  import { Link } from 'gatsby'
  
  const Header = (props) => (
      <header id="header" className="alt">
          <nav>
              <a className="menu-link" onClick={props.onToggleMenu} href="javascript:;">Menu</a>
          </nav>
      </header>
  )
  
  Header.propTypes = {
      onToggleMenu: PropTypes.func
  }
  
  export default Header
  