Instagram auto-liker

insta.js

(function (delay, type) {
  const g = (c) => document.getElementsByClassName(c);
  const pics = g('_si7dy');

  function iteration() {
    const heart = g((type === 'like') ? 'coreSpriteHeartOpen' : 'coreSpriteHeartFull')[0];
    heart && heart.click();
    g('coreSpriteRightPaginationArrow')[0].click();
  }

  new MutationObserver((muts) => {
    muts.forEach((mut) => {
      if (mut.addedNodes.length) {
        setTimeout(iteration, delay);
        new MutationObserver((muts) => {
          muts.forEach((mut) => {
            if (mut.addedNodes.length) setTimeout(iteration, delay);
          });
        }).observe(mut.addedNodes[0].firstChild.children[1].firstChild.firstChild, { attributes: true, childList: true, characterData: true });
      }
    });
  }).observe(document.body, { childList: true });

})(100, 'like');