code: function off(eventName, handler, context, args, once) {
      if (!this.__listeners || !this.__listeners[eventName]) {
          return;
      }
      this
          .getListeners(eventName, handler, context, args, once)
          .forEach((config) => {
              this.__listeners[eventName].splice(this.__listeners[eventName].indexOf(config), 1);
          });
  
  }
docs: Adds listener for an event
  @param {string} eventName
  @param {function} handler
  @param {object} context
  @param {array} args
  @param {boolean} once