code: function _unwrapStorageSnapshot(storageSnapshot) {
      return {
        bytesTransferred: storageSnapshot.bytesTransferred,
        downloadURL: storageSnapshot.downloadURL,
        metadata: storageSnapshot.metadata,
        ref: storageSnapshot.ref,
        state: storageSnapshot.state,
        task: storageSnapshot.task,
        totalBytes: storageSnapshot.totalBytes
      };
    }
docs: Take a Storage snapshot and unwrap only the needed properties.
  
  @param snapshot
  @returns An object containing the unwrapped values.