Firestore project: Import of API interfaces. (#1337)

- 198063502 Address comment upstream. by zxu <zxu>
  - 197942352 Fix style upstream and fix destination depot in copybara. by zxu <zxu>
  - 197925542 Fix headers with change from GitHub, see the current diff... by zxu <zxu>
  - 197922012 Implement ListenerRegistration::Remove(). by zxu <zxu>
  - 197713382 Implement more on listener class and implement ListenerRe... by zxu <zxu>
  - 196551381 Implement more on listener class and implement the Docume... by zxu <zxu>
  - 196276752 Implement the SnapshotMetadata with inline methods and (n... by zxu <zxu>
  - 195841793 Implement the wrapper class for callback (EventListener). by zxu <zxu>
  - 194112388 Add Android-Wrapper for DocumentReference's non-callback ... by zxu <zxu>
  - 192445183 Add Android-Wrapper for Firestore's remaining methods. by zxu <zxu>
  - 190986604 Manually import the public portion of by mcg <mcg>
  - 189013767 Add Android-Wrapper for Firestore's method that does not ... by zxu <zxu>
  - 188809445 Import of firebase-ios-sdk from Github. by mcg <mcg>
  - 187049498 Import of firebase-ios-sdk from Github. by mcg <mcg>
  - 184568931 Import of firebase-ios-sdk from Github. by mcg <mcg>

ORIGINAL_AUTHOR=Firebase <firebase-noreply>
PiperOrigin-RevId: 198063502

1 files changed, 4 insertions, 0 deletions

diff --git a/Firestore/core/include/firebase/firestore/firestore_errors.h b/Firestore/core/include/firebase/firestore/firestore_errors.h
index 7a0ff7c..92c0c92 100644
--- a/Firestore/core/include/firebase/firestore/firestore_errors.h
+++ b/Firestore/core/include/firebase/firestore/firestore_errors.h
@@ -109,6 +109,10 @@ enum FirestoreErrorCode {
   Unauthenticated = 16
 };
 
+// TODO(zxu123): decide whether we actually want an Error class or just use
+// enum.
+using Error = FirestoreErrorCode;
+
 }  // namespace firestore
 }  // namespace firebase