GitLab - Default Add Comment

Makes "Add comment now" the default action in GitLab and remove the Start a Review
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// ==UserScript==
// @name         GitLab - Default Add Comment
// @namespace    https://github.com/yourname
// @version      1.0
// @description  Makes "Add comment now" the default action in GitLab and remove the Start a Review
// @author       Squiter
// @match        https://gitlab.com/*
// @icon         https://gitlab.com/favicon.ico
// @license      MIT
// @grant        none
// ==/UserScript==

(function () {
  'use strict';

  // ---------- CONFIG ----------
  const START_REVIEW_SELECTOR = '[data-testid="start-review-button"]';
  const COMMENT_NOW_SELECTOR  = '[data-testid="comment-now-button"]';
  const TEXTAREA_SELECTOR     = 'textarea[data-testid="reply-field"]';

  // ---------- HELPERS ----------

  function hideStartReview() {
    document.querySelectorAll(START_REVIEW_SELECTOR).forEach(btn => {
      btn.style.display = 'none';
    });
  }

  function getCommentButton() {
    return document.querySelector(COMMENT_NOW_SELECTOR);
  }

  function shouldSubmit(e) {
    // Enter = submit
    // Shift+Enter = newline (keep normal behavior)
    return e.key === "Enter" && !e.shiftKey;
  }

  function attachEnterHandler(textarea) {
    if (textarea.dataset.enterHandlerAttached) return;
    textarea.dataset.enterHandlerAttached = "true";

    textarea.addEventListener("keydown", (e) => {
      if (!shouldSubmit(e)) return;

      const btn = getCommentButton();
      if (!btn || btn.disabled) return;

      e.preventDefault();
      e.stopPropagation();

      btn.click();
    });
  }

  function init() {
    hideStartReview();

    document.querySelectorAll(TEXTAREA_SELECTOR)
      .forEach(attachEnterHandler);
  }

  // ---------- OBSERVER ----------
  // GitLab rerenders often (Vue), so we watch DOM changes

  const observer = new MutationObserver(() => {
    init();
  });

  observer.observe(document.body, {
    childList: true,
    subtree: true
  });

  // initial run
  init();
})();