A simple console dump of all links, highlights undefined links and turns them into annoying big red boxes.

log-links.js

//Requires jQuery (I KNOW!)
(($) => {
  $('a[href]:not([aria-hidden])').each(function() {
    const $link = $(this)
    let text = $link.text()
    if($link.find('img').length) {
      text = $link.find('img').attr('alt')
    }
    if(text.trim().length == 0) {
      console.log(`UNDEFINED LINK: ${$link.attr('href')}`)
      $link.css('background', 'red')
        .css('display', 'inline-block')
        .width(100)
        .height(100)
      return
    }
    console.log(text)
  })
})(jQuery)