text: /*
   * Copyright 2017 Google
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  /** Represents a listener that can be removed by calling remove. */
  NS_SWIFT_NAME(ListenerRegistration)
  @protocol FIRListenerRegistration <NSObject>
  
  /**
   * Removes the listener being tracked by this `ListenerRegistration`. After the initial call,
   * subsequent calls have no effect.
   */
  - (void)remove;
  
  @end
  
  NS_ASSUME_NONNULL_END
  