Slack macro to quickly delete messages, activate this script and click on the messages you want to be deleted

slack-macro.js

document.addEventListener("click", event => {
  const [element] = event.path;

  console.warn({ element });

  // click on more actions menu, which is only visible when you hover a message
  if (
    element.classList.contains("c-message__body") ||
    element.classList.contains("c-message__content_header") ||
    element.classList.contains("c-file_gallery") ||
    element.classList.contains("c-message_kit__gutter__left") ||
    element.classList.contains("c-message_kit__gutter__right") ||
    element.classList.contains("c-message_kit__text")
  ) {
    const actionButtons = document.querySelectorAll(
      "button.c-message_actions__button"
    );
    const moreActions = actionButtons[actionButtons.length - 1];
    moreActions.click();
  }

  // click on the delete message action
  else if (
    element.classList.contains("c-message_actions__button") ||
    element.classList.contains("c-icon--small-ellipsis")
  ) {
    const deleteButton = document.querySelector(
      ".p-message_actions_menu__delete_message"
    );
    deleteButton.click();
  }

  // click on the confirm button to delete message
  else if (
    element.classList.contains("p-message_actions_menu__delete_message")
  ) {
    setTimeout(() => {
      const deleteConfirm = document.querySelector(".c-button--danger");
      deleteConfirm.click();
    });
  }
});