How to use the @rmwc/base.ArrayEmitter function in @rmwc/base

export const createSnackbarQueue = (): {
  messages: ArrayEmitter;
  notify: (message: SnackbarQueueMessage) => void;
} => {
  const messages = new ArrayEmitter();

  return {
    messages,
    notify: (message: SnackbarQueueMessage) => {
      messages.push(message);
    }
  };
};

export const createDialogQueue = (): {
  dialogs: ArrayEmitter;
  alert: (dialog: DialogQueueInput) => Promise;
  confirm: (dialog: DialogQueueInput) => Promise;
  prompt: (dialog: DialogQueueInput) => Promise;
} => {
  const dialogs = new ArrayEmitter();

  return {
    dialogs,
    alert: dialogFactory(alertFactory, dialogs),
    confirm: dialogFactory(confirmFactory, dialogs),
    prompt: dialogFactory(promptFactory, dialogs)
  };
};