Discord - Hide blocked messages.greasemonkey.js

// ==UserScript==
// @name     Discord - Hide blocked messages
// @version  1
// @grant    none
// @match		 https://discordapp.com/*
// @run-at   document-start
// ==/UserScript==

(() => {
  const callback = (mutationsList, observer) => {
    mutationsList.forEach((mut) => {
        if(mut.addedNodes.length === 0) return;

        mut.target.querySelectorAll('[class*="blockedSystemMessage"]').forEach((msg) => {
            let el = msg.parentElement;
            while(el && !el.className.match(/wrapper-/)) el = el.parentElement;
            if(el) el.remove();
        });
    });
  };
  
  const observer = new MutationObserver(callback);
  observer.observe(document.body, { childList: true, subtree: true });
  
  if(window.observer) window.observer.disconnect();
  window.observer = observer;
})();