Find messages with links pattern on VK IM page

find-VK-messages.js

const config = {
  filterBySender: "Вы",
  regex: /coub\.com\/view\/[a-z0-9]+/,
  timeToLoad: 750,
};

const dialogsRoot = document.querySelector("#im_dialogs");

const dialogScrollableArea = document.querySelector(
  "#im_dialogs .ui_scroll_inner.tt_noappend"
);

let result = new Set();

const url = new URL(window.location.href);
if (url.searchParams.get("q")) {
  console.log("User is on right location. Staring script...");

  let addedMessagesCounter = 1;
  const timer = setInterval(() => {
      addedMessagesCounter = 0;
      console.log("There is new messages, start to search...");
  
      const messages = document.querySelectorAll("#im_dialogs li.nim-dialog");
      console.log(`Found ${messages.length} messages, proceed to process...`);
  
      messages.forEach((message) => {
        const sender = message.querySelector(
          ".nim-dialog--content .nim-dialog--text-preview .nim-dialog--who"
        )?.innerText;
        const text = message.querySelector(
          ".nim-dialog--content .nim-dialog--text-preview .nim-dialog--inner-text"
        )?.innerText;
        if (sender?.includes(config.filterBySender) & config.regex.test(text)) {
          const foundString = text.match(config.regex);
          const resultBeforeSize = result.size;
          const resultCopy = result.add(foundString[0]);
          if (resultBeforeSize !== resultCopy.size) {
              addedMessagesCounter++;
          } 
        }
      });
      console.log(
        `Added ${addedMessagesCounter} messages, now scroll to load new messages...`
      );

      if (addedMessagesCounter === 0) {
          console.info(`Success! Got ${result.size} messages`);
          console.dir(result);
          clearInterval(timer);
      }
  
      dialogScrollableArea.scrollIntoView(false);
      dialogScrollableArea.scrollIntoView(false);
  }, config.timeToLoad ?? 1000);
} else {
  alert("You are not on required location! Script aborting...");
  if (result.size > 0) {
      console.info(`Despite fail, still got ${result.size} messages`);
      console.dir(result);
  }
}