How to use the parse-server/lib/cache.AppCache.get function in parse-server

Parse.Cloud.define("inviteUser", async request => {
  if (!request.user)
    throw 'Must be signed in to call this Cloud Function.';
  
  const {email, siteName} = request.params;
  if (!email || !siteName)
    throw 'Email or siteName is empty!';

  console.log(`Send invite to ${email} ${new Date()}`);
  
  const {AppCache} = require('parse-server/lib/cache');
  const emailAdapter = AppCache.get(config.appId)['userController']['adapter'];

  const emailSelf = request.user.get('email');
  const link = `${SITE}/sign?mode=register&email=${email}`;

  try {
    await emailAdapter.send({
      templateName: 'inviteEmail',
      recipient: email,
      variables: {siteName, emailSelf, link}
    });
    console.log(`Invite sent to ${email} ${new Date()}`);
    return "Invite email sent!";
  
  } catch (error) {
    console.log(`Got an error in inviteUser: ${error}`);
    throw error;