How to use the @wireapp/store-engine/dist/commonjs/engine/.MemoryEngine function in @wireapp/store-engine

(async () => {
  const login = {
    clientType: ClientType.TEMPORARY,
    email: process.env.WIRE_EMAIL,
    password: process.env.WIRE_PASSWORD,
  };

  const backend = process.env.WIRE_BACKEND === 'staging' ? APIClient.BACKEND.STAGING : APIClient.BACKEND.PRODUCTION;
  const engine = new MemoryEngine();
  await engine.init('receiver');

  const apiClient = new APIClient({store: engine, urls: backend});
  const account = new Account(apiClient);

  const handleIncomingMessage = async messageData => {
    const CONFIRM_TYPES = [
      PayloadBundleType.ASSET,
      PayloadBundleType.ASSET_IMAGE,
      PayloadBundleType.LOCATION,
      PayloadBundleType.PING,
      PayloadBundleType.TEXT,
    ];
    const {content, conversation: conversationId, from, id: messageId, messageTimer = 0, type} = messageData;
    const additionalContent = [];