Lambda Console: Rewrite links to Lambda monitoring tab

lambda-monitoring.user.js

// ==UserScript==
// @name        Lambda Console: Rewrite links to Lambda monitoring tab
// @description When listing Lambda functions, this rewrites all function links to go straight to the "Monitoring" tab
// @version     6
// @grant       none
// @match       https://*.console.aws.amazon.com/lambda/home*
// ==/UserScript==

// Copied from https://stackoverflow.com/a/61511955/473467
function waitForElm(selector) {
  return new Promise(resolve => {
    if (document.querySelector(selector)) {
      return resolve(document.querySelector(selector));
    }

    const observer = new MutationObserver(mutations => {
      if (document.querySelector(selector)) {
        observer.disconnect();
        resolve(document.querySelector(selector));
      }
    });

    // If you get "parameter 1 is not of type 'Node'" error, see https://stackoverflow.com/a/77855838/492336
    observer.observe(document.body, {
      childList: true,
      subtree: true
    });
  });
}

waitForElm('#lambda-listFunctions').then((listFunctionsElem) => {
  console.log('List of Lambda functions is ready');

  // Callback function to execute when mutations are observed
  const callback = (mutationList, observer) => {
    for (const mutation of mutationList) {
      if (mutation.type === "childList") {
        const functionLinks = document.querySelectorAll("a[href^='#/functions/']");
        functionLinks.forEach(functionLink => { functionLink.href = functionLink.href + "?tab=monitoring"; });
      }
    }
  };

  // Create an observer instance linked to the callback function
  const observer = new MutationObserver(callback);

  // Start observing the target node for configured mutations
  observer.observe(listFunctionsElem, { childList: true, subtree: true });
});