firebase-ios-sdk/Firestore/CHANGELOG.md

11.1.0

• [feature] Add VectorValue type support.

11.0.0

• [removed] Breaking change: The deprecated FirebaseFirestoreSwift module has been removed. See https://firebase.google.com/docs/ios/swift-migration for migration instructions.
• [changed] Breaking change: LRU Garbage Collector is now the default GC for memory cache, eager GC is now opt-in (via MemoryCacheSettings(garbageCollectorSettings: MemoryEagerGCSettings())) instead of the default one.
• [changed] Move Timestamp class into FirebaseCore. FirebaseFirestore.Timestamp was changed to FirebaseCore.Timestamp. (#13221)
• [changed] Update gRPC dependency to 1.65.

10.25.0

• [fixed] Allow blob of data with zero length. (#11773, #12620)
• [changed] Passing a non-nil value to the @DocumentID property wrapper's setter no longer logs a warning since it discouraged valid patterns, e.g., updating the document ID after the document is created in Firestore. (#12756)

10.24.0

• [feature] Enable queries with range & inequality filters on multiple fields. (#12416)

10.23.0

• [feature] Enable snapshot listener option to retrieve data from local cache only. (#12370)
• [fixed] Update gRPC dependency to 1.62.* (#12098, #12021)
• [feature] Firestore's binary Swift Package Manager distribution uses XCFrameworks with code signatures (#12238).

10.22.0

• [fixed] Fix the flaky offline behaviour when using arrayRemove on Map object. (#12378)

10.21.0

• Add an error when trying to build Firestore's binary SPM distribution for visionOS (#12279). See Firestore's 10.12.0 release note for a supported workaround.

10.19.0

• [fixed] Made an optimization to the synchronization logic for resumed queries to only re-download locally-cached documents that are known to be out-of-sync. (#12044)

10.18.0

• [fixed] Fix Firestore build for visionOS on Xcode 15.1. (#12023)

10.17.0

• [feature] Add support for sum and average aggregate queries.
• [feature] The FirebaseFirestore module now contains Firebase Firestore's Swift-only APIs that were previously only available via the FirebaseFirestoreSwift extension SDK. See the FirebaseFirestoreSwift release note from this release for more details.

10.16.0

• [fixed] Fixed an issue where Firestore's binary SwiftPM distribution would not link properly when building a target for testing. This issue affected Xcode 15 Beta 5 and later (#11656).
• [fixed] Downgrade the CocoaPods grpc dependency back to 1.44.0 (from 1.50.1) to fix a crash on iOS 12 devices that was introduced in the Firebase Apple SDK 10.10.0 when the grpc dependency was upgraded (#11509).

10.15.0

• [feature] Add the option to allow the SDK to create cache indexes automatically to improve query execution locally. (#11596)

10.12.0

• [feature] Implemented an optimization in the local cache synchronization logic that reduces the number of billed document reads when documents were deleted on the server while the client was not actively listening to the query (e.g. while the client was offline). (#11457)

• [added] Developers using Firestore on visionOS must use a source Firestore distribution rather than the default binary distribution. To do this, quit Xcode and open the desired project from the command line with the FIREBASE_SOURCE_FIRESTORE environment variable:

  open --env FIREBASE_SOURCE_FIRESTORE /path/to/project.xcodeproj
  

  To go back to using the binary distribution of Firestore, quit Xcode and open Xcode like normal, without the environment variable. (#11492)

10.11.0

• [feature] Expose MultiDb API for public preview. (#10465)
• [fixed] Fixed a compilation warning related to integer casting. (#11332)
• [fixed] Allow initializing FIRLocalCacheSettings with unlimited size. (#11405)

10.9.0

• [feature] Add new cache config API to customize SDK cache settings.
• [feature] Add LRU garbage collector as an option to memory cache.

10.8.0

• [feature] Change Firestore's Swift Package Manager distribution from source to binary to reduce the time it takes to add the Firebase package and to build the Firestore SDK (#6564).
• [fixed] Fixed SSL symbol collision issue affecting SwiftPM users. (#6869)

10.7.0

• [feature] Add support for disjunctions in queries (OR queries).
• [fixed] Fixed stack overflow caused by deeply nested server timestamps.

10.6.0

• [fixed] Fix a potential high memory usage issue.

10.5.0

• [fixed] Add @discardableResult to addDocument API for easy handling unused return value. (#10640)

10.4.0

• [fixed] Fix an issue that stops some performance optimization being applied (#10579).

10.3.0

• [feature] Add MultiDb support.
• [fixed] Fix App crashed when there are nested data structures inside IN Filter (#10507).

10.2.0

• [fixed] Fix FAILED_PRECONDITION when writing to a deleted document in a transaction (#10431).
• [fixed] Fixed data race in credentials provider (#10393).
• [fixed] Fix Firestore failing to raise initial snapshot from empty local cache result (#10437).

10.0.0

• [feature] Added Query.count(), which fetches the number of documents in the result set without actually downloading the documents (#10246).
• [fixed] Fixed compiler warning about @param comparator (#10226).

9.6.0

• [added] Expose client side indexing feature with FIRFirestore.setIndexConfigurationFromJSON and FIRFirestore.setIndexConfigurationFromStream (#10090).
• [fixed] Fixed high CPU usage whenever Firestore was in use (#10168).

9.5.0

• [fixed] Fixed an intermittent crash if ListenerRegistration::Remove() was invoked concurrently (#10065).
• [fixed] Fixed a crash if multiple large write batches with overlapping documents were executed where at least one batch performed a delete operation (#9965).

9.4.0

• [fixed] Fixed a crash during app start (#9985, #10018).

9.2.0

• [feature] Added TransactionOptions to control how many times a transaction will retry commits before failing (#9838).

9.0.0

• [fixed] Fixed CMake build errors when building with Xcode 13.3.1 (#9702).
• [fixed] Breaking change: Fixed an issue where returning nil from the update closure when running a transaction caused a crash in Swift by removing the auto-generated async throwing method from the FirebaseFirestore module. In order to use the async throwing transaction method, add the FirebaseFirestoreSwift module dependency to your build target (#9426).

8.15.0

• [changed] Potentially fixed a crash during application exit caused by an assertion about ordering documents by missing fields (#9258).
• [changed] Add more details to the assertion failure in Query::Comparator() to help with future debugging (#9258).

8.14.0

• [fixed] Fixed compiler warnings in local_serializer.cc about "implicit conversion loses integer precision" that were introduced in 8.13.0 (#9430).

8.12.1

• [changed] Add more details to the assertion failure in OrderBy::Compare() to help with future debugging (#9258).

8.11.0

• [fixed] Fixed an issue that can result in incomplete Query snapshots when an app is backgrounded during query execution.

8.9.1

• [fixed] Fixed a bug in the AppCheck integration that caused the SDK to respond to unrelated notifications (#8895).

8.9.0

• [added] Added support for Firebase AppCheck.
• [fixed] Fix a crash if [FIRTransaction getDocument] was called after [FIRFirestore terminateWithCompletion] (#8760).
• [fixed] Fixed a performance issue due to repeated schema migrations at app startup (#8791).

8.6.0

• [changed] Internal refactor to improve serialization performance.
• [changed] DocumentSnapshot objects consider the document's key and data for equality comparison, but ignore the internal state and internal version.

8.4.0

• [fixed] Fixed handling of Unicode characters in log and assertion messages (#8372).

8.2.0

• [changed] Passing in an empty document ID, collection group ID, or collection path will now result in a more readable error (#8218).

7.9.0

• [feature] Added support for Firestore Bundles via FIRFirestore.loadBundle, FIRFirestore.loadBundleStream and FIRFirestore.getQueryNamed. Bundles contain pre-packaged data produced with the Server SDKs and can be used to populate Firestore's cache without reading documents from the backend.

7.7.0

• [fixed] Fixed a crash that could happen when the App is being deleted and there's an active listener (#6909).
• [fixed] Fixed a bug where local cache inconsistencies were unnecessarily being resolved (#7455).

7.5.0

• [changed] A write to a document that contains FieldValue transforms is no longer split up into two separate operations. This reduces the number of writes the backend performs and allows each WriteBatch to hold 500 writes regardless of how many FieldValue transformations are attached.
• [fixed] Fixed an issue where using FieldValue.arrayRemove() would only delete the first occurrence of an element in an array in a latency compensated snapshots.

7.3.0

• [fixed] Fixed a crash that could happen when the SDK encountered invalid data during garbage collection (#6721).

7.2.0

• [added] Made emulator connection API consistent between Auth, Database, Firestore, and Functions (#5916).

7.1.0

• [changed] Added the original query data to error messages for Queries that cannot be deserizialized.
• [fixed] Remove explicit MobileCoreServices library linkage from podspec (#6850).
• [fixed] Removed excess validation of null and NaN values in query filters. This more closely aligns the SDK with the Firestore backend, which has always accepted null and NaN for all operators, even though this isn't necessarily useful.

7.0.0

• [changed] Breaking change: Removed the areTimestampsInSnapshotsEnabled setting. Timestamp fields that read from a FIRDocumentSnapshot now always return FIRTimestamp objects. Use FIRTimestamp.dateValue to convert to NSDate if required.
• [fixed] Fixed a memory leak introduced in 1.18.0 that may manifest when serializing queries containing equality or non-equality comparisons.

1.19.0

• [changed] Internal improvements for future C++ and Unity support. Includes a breaking change for the Firestore C++ Alpha SDK, but does not affect Objective-C or Swift users.
• [changed] Added new internal HTTP headers to the gRPC connection.

1.18.0

• [feature] Added whereField(_:notIn:) and whereField(_:isNotEqualTo:) query operators. whereField(_:notIn:) finds documents where a specified field’s value is not in a specified array. whereField(_:isNotEqualTo:) finds documents where a specified field's value does not equal the specified value. Neither query operator will match documents where the specified field is not present.

1.17.1

• [fixed] Fix gRPC documentation warning surfaced in Xcode (#6340).

1.17.0

• [changed] Internal improvements for future C++ and Unity support.

1.16.4

• [changed] Rearranged public headers for future Swift Package Manager support. This should have no impact existing users of CocoaPods, Carthage, or zip file distributions.

1.16.3

• [changed] Internal improvements for future C++ and Unity support.

1.16.2

• [fixed] Fixed a configuration issue where listeners were no longer being called back on the main thread by default.

1.16.1

• [fixed] Removed a delay that may have prevented Firestore from immediately establishing a network connection if a connectivity change occurred while the app was in the background (#5783).
• [fixed] Fixed a rare crash that could happen if the garbage collection process for old documents in the cache happened to run during a LevelDB compaction (#5881).

1.16.0

• [fixed] Fixed an issue that may have prevented the client from connecting to the backend immediately after a user signed in.

1.15.0

• [changed] Internal improvements for future C++ and Unity support. Includes a breaking change for the Firestore C++ Alpha SDK, but does not affect Objective-C or Swift users.

1.14.0

• [changed] Internal improvements for future C++ and Unity support. Includes a breaking change for the Firestore C++ Alpha SDK, but does not affect Objective-C or Swift users.

1.13.0

• [changed] Firestore now limits the number of concurrent document lookups it will perform when resolving inconsistencies in the local cache (https://github.com/firebase/firebase-js-sdk/issues/2683).
• [changed] Upgraded gRPC-C++ to 1.28.0 (#4994).
• [fixed] Firestore will now send Auth credentials to the Firestore Emulator (#5072).

1.12.1

• [changed] Internal improvements for future C++ and Unity support.

1.12.0

• [changed] Internal improvements for future C++ and Unity support. Includes a breaking change for the Firestore C++ Alpha SDK, but does not affect Objective-C or Swift users.

1.11.2

• [fixed] Fixed the FirebaseFirestore podspec to properly declare its dependency on the UIKit framework on iOS and tvOS.

1.11.1

• [fixed] Firestore should now recover its connection to the server more quickly after returning from the background (#4905).

1.11.0

• [changed] Improved performance of queries with large result sets.

1.10.2

• [changed] Internal improvements.

1.10.1

• [changed] Internal improvements.

1.10.0

• [feature] Firestore previously required that every document read in a transaction must also be written. This requirement has been removed, and you can now read a document in a transaction without writing to it.
• [changed] Improved the performance of repeatedly executed queries when persistence is enabled. Recently executed queries should see dramatic improvements. This benefit is reduced if changes accumulate while the query is inactive. Queries that use the limit() API may not always benefit, depending on the accumulated changes.
• [changed] Changed the location of Firestore's locally stored data from the Documents folder to Library/Application Support, hiding it from users of apps that share their files with the iOS Files app. Important: After a user's data is migrated, downgrading to an older version of the SDK will cause the user to appear to lose data, since older versions of the SDK can't read data from the new location (#843).

1.9.0

• [feature] Added a limit(toLast:) query operator, which returns the last matching documents up to the given limit.

1.8.3

• [changed] Internal improvements.

1.8.2

• [changed] Internal improvements.

1.8.1

• [fixed] Firestore no longer loads its TLS certificates from a bundle, which fixes crashes at startup when the bundle can't be loaded. This fixes a specific case where the bundle couldn't be loaded due to international characters in the application name. If you're manually tracking dependencies, you can now remove gRPCCertificates-Cpp.bundle from your build. (#3951).

1.8.0

• [changed] Removed Firestore's dependency on the Protobuf CocoaPod. If you're manually tracking dependencies, you may be able to remove it from your build (note, however, that other Firebase components may still require it).
• [changed] Added a dependency on the abseil CocoaPod. If you're manually tracking dependencies, you need to add it to your build.

1.7.0

• [feature] Added whereField(_:in:) and whereField(_:arrayContainsAny:) query operators. whereField(_:in:) finds documents where a specified field’s value is IN a specified array. whereField(_:arrayContainsAny:) finds documents where a specified field is an array and contains ANY element of a specified array.
• [changed] Firestore SDK now uses Nanopb rather than the Objective-C Protobuf library for parsing protos. This change does not affect visible behavior of the SDK in any way. While we don't anticipate any issues, please report any issues with network behavior or persistence that you experience.

1.6.1

• [fixed] Fixed a race condition that could cause a segmentation fault during client initialization.

1.6.0

• [feature] Added an addSnapshotsInSyncListener() method to FIRFirestore that notifies you when all your snapshot listeners are in sync with each other.

1.5.1

• [fixed] Fixed a memory access error discovered using the sanitizers in Xcode 11.

1.5.0

• [changed] Transactions now perform exponential backoff before retrying. This means transactions on highly contended documents are more likely to succeed.
• [feature] Added a waitForPendingWrites() method to FIRFirestore class which allows users to wait on a promise that resolves when all pending writes are acknowledged by the Firestore backend.
• [feature] Added a terminate() method to FIRFirestore which terminates the instance, releasing any held resources. Once it completes, you can optionally call clearPersistence() to wipe persisted Firestore data from disk.

1.4.5

• [fixed] Fixed a crash that would happen when changing networks or going from online to offline. (#3661).

1.4.4

• [changed] Internal improvements.

1.4.3

• [changed] Transactions are now more flexible. Some sequences of operations that were previously incorrectly disallowed are now allowed. For example, after reading a document that doesn't exist, you can now set it multiple times successfully in a transaction.

1.4.2

• [fixed] Fixed an issue where query results were temporarily missing documents that previously had not matched but had been updated to now match the query (https://github.com/firebase/firebase-android-sdk/issues/155).
• [fixed] Fixed an internal assertion that was triggered when an update with a FieldValue.serverTimestamp() and an update with a FieldValue.increment() were pending for the same document.
• [fixed] Fixed the oldIndex and newIndex values in DocumentChange to actually be NSNotFound when documents are added or removed, respectively (#3298).
• [changed] Failed transactions now return the failure from the last attempt, instead of ABORTED.

1.4.1

• [fixed] Fixed certificate loading for non-CocoaPods builds that may not include bundle identifiers in their frameworks or apps (#3184).

1.4.0

• [feature] Added clearPersistence(), which clears the persistent storage including pending writes and cached documents. This is intended to help write reliable tests (https://github.com/firebase/firebase-js-sdk/issues/449).

1.3.2

• [fixed] Firestore should now recover its connection to the server more quickly after being on a network suffering from total packet loss (#2987).
• [fixed] Changed gRPC-C++ dependency to 0.0.9 which adds support for using it concurrently with the Objective-C gRPC CocoaPod. This fixes certificate errors you might encounter when trying to use Firestore and other Google Cloud Objective-C APIs in the same project.

1.3.1

• [fixed] Disabling garbage collection now avoids even scheduling the collection process. This can be used to prevent crashes in the background when using NSFileProtectionComplete. Note that Firestore does not support operating in this mode--nearly all API calls will cause crashes while file protection is enabled. This change just prevents a crash when Firestore is idle (#2846).

1.3.0

• [feature] You can now query across all collections in your database with a given collection ID using the Firestore.collectionGroup() method.
• [feature] Added community support for tvOS.

1.2.1

• [fixed] Fixed a use-after-free bug that could be observed when using snapshot listeners on temporary document references (#2682).

1.2.0

• [feature] Added community support for macOS (#434).
• [fixed] Fixed the way gRPC certificates are loaded on macOS (#2604).

1.1.0

• [feature] Added FieldValue.increment(), which can be used in updateData(_:) and setData(_:merge:) to increment or decrement numeric field values safely without transactions.
• [changed] Improved performance when querying over documents that contain subcollections (#2466).
• [changed] Prepared the persistence layer to support collection group queries. While this feature is not yet available, all schema changes are included in this release.

1.0.2

• [changed] Internal improvements.

1.0.1

• [changed] Internal improvements.

1.0.0

• [changed] Breaking change: The areTimestampsInSnapshotsEnabled setting is now enabled by default. Timestamp fields that read from a FIRDocumentSnapshot will be returned as FIRTimestamp objects instead of NSDate objects. Update any code that expects to receive an NSDate object. See the reference documentation for more details.
• [changed] Breaking change: FIRTransaction.getDocument() has been changed to return a non-nil FIRDocumentSnapshot with exists equal to false if the document does not exist (instead of returning a nil FIRDocumentSnapshot). Code that includes if (snapshot) { ... } must be changed to if (snapshot.exists) { ... }.
• [fixed] Fixed a crash that could happen when the app is shut down after a write has been sent to the server but before it has been received on a listener (#2237).
• [changed] Firestore no longer bundles a copy of the gRPC certificates, now that the gRPC-C++ CocoaPod includes them. CocoaPods users should be updated automatically. Carthage users should follow the updated instructions to get gRPCCertificates.bundle from the correct location.

0.16.1

• [fixed] Offline persistence now properly records schema downgrades. This is a forward-looking change that allows all subsequent versions to safely downgrade to this version. Some other versions might be safe to downgrade to, if you can determine there haven't been any schema migrations between them. For example, downgrading from v0.16.1 to v0.15.0 is safe because there have been no schema changes between these releases.
• [fixed] Fixed an issue where gRPC would crash if shut down multiple times (#2146).

0.16.0

• [changed] Added a garbage collection process to on-disk persistence that removes older documents. This is enabled by default, and the SDK will attempt to periodically clean up older, unused documents once the on-disk cache passes a threshold size (default: 100 MB). This threshold can be configured by setting FIRFirestoreSettings.cacheSizeBytes. It must be set to a minimum of 1 MB. The garbage collection process can be disabled entirely by setting FIRFirestoreSettings.cacheSizeBytes to kFIRFirestoreCacheSizeUnlimited.

0.15.0

• [changed] Changed how the SDK handles locally-updated documents while syncing those updates with Cloud Firestore servers. This can lead to slight behavior changes and may affect the SnapshotMetadata.hasPendingWrites metadata flag.
• [changed] Eliminated superfluous update events for locally cached documents that are known to lag behind the server version. Instead, the SDK buffers these events until the client has caught up with the server.
• [changed] Moved from Objective-C gRPC framework to gRPC C++. If you're manually tracking dependencies, the gRPC, gRPC-ProtoRPC, and gRPC-RxLibrary frameworks have been replaced with gRPC-C++. While we don't anticipate any issues, please report any issues with network behavior you experience. (#1968)

0.14.0

• [fixed] Fixed compilation in C99 and C++11 modes without GNU extensions.

0.13.6

• [changed] Internal improvements.

0.13.5

• [changed] Some SDK errors that represent common mistakes (such as permission denied or a missing index) will automatically be logged as a warning in addition to being surfaced via the API.

0.13.4

• [fixed] Fixed an issue where the first get() call made after being offline could incorrectly return cached data without attempting to reach the backend.
• [changed] Changed get() to only make one attempt to reach the backend before returning cached data, potentially reducing delays while offline.
• [fixed] Fixed an issue that caused Firebase to drop empty objects from calls to setData(..., merge:true).

0.13.3

• [changed] Internal improvements.

0.13.2

• [fixed] Fixed an issue where changes to custom authentication claims did not take effect until you did a full sign-out and sign-in. (#1499)
• [changed] Improved how Firestore handles idle queries to reduce the cost of re-listening within 30 minutes.

0.13.1

• [fixed] Fixed an issue where get(source:.Cache) could throw an "unrecognized selector" error if the SDK has previously cached the non-existence of the document (#1632).

0.13.0

• [feature] Added FieldValue.arrayUnion() and FieldValue.arrayRemove() to atomically add and remove elements from an array field in a document.
• [feature] Added whereField(_:arrayContains:) query filter to find documents where an array field contains a specific element.
• [fixed] Fixed compilation with older Xcode versions (#1517).
• [fixed] Fixed a performance issue where large write batches with hundreds of changes would take a long time to read and write and consume excessive memory. Large write batches should now see no penalty.
• [fixed] Fixed a performance issue where adding a listener for a large (thousands of documents) collection would take a long time in offline mode (#1477).
• [fixed] Fixed an issue that could cause deleted documents to momentarily re-appear in the results of a listener, causing a flicker (#1591).

0.12.6

• [fixed] Fixed an issue where queries returned fewer results than they should, caused by documents that were cached as deleted when they should not have been (#1548). Some cache data is cleared and so clients may use extra bandwidth the first time they launch with this version of the SDK.

0.12.5

• [changed] Internal improvements.

0.12.4

• [fixed] setData methods taking mergeFields: arguments can now delete fields using FieldValue.delete().
• [fixed] Firestore will now recover from auth token expiration when the system clock is wrong.
• [fixed] Fixed compilation with older Xcode versions (#1366).

0.12.3

• [changed] Internal improvements.

0.12.2

• [fixed] Fixed an issue where FirestoreSettings would accept a concurrent dispatch queue, but this configuration would trigger an assertion failure. Passing a concurrent dispatch queue should now work correctly (#988).

0.12.1

• [changed] Internal improvements.

0.12.0

• [changed] Replaced the DocumentListenOptions object with a simple boolean. Instead of calling addSnapshotListener(options: DocumentListenOptions.includeMetadataChanges(true)) call addSnapshotListener(includeMetadataChanges:true).
• [changed] Replaced the QueryListenOptions object with simple booleans. Instead of calling addSnapshotListener(options: QueryListenOptions.includeQueryMetadataChanges(true) .includeDocumentMetadataChanges(true)) call addSnapshotListener(includeMetadataChanges:true).
• [changed] QuerySnapshot.documentChanges() is now a method which optionally takes includeMetadataChanges:true. By default even when listening to a query with includeMetadataChanges:true metadata-only document changes are suppressed in documentChanges().
• [changed] Replaced the SetOptions object with a simple boolean. Instead of calling setData(["a": "b"], options: SetOptions.merge()) call setData(["a": "b"], merge: true).
• [changed] Replaced the SnapshotOptions object with direct use of the FIRServerTimestampBehavior on DocumentSnapshot. Instead of calling data(SnapshotOptions.serverTimestampBehavior(.estimate)) call data(serverTimestampBehavior: .estimate). Changed get similarly.
• [changed] Added ability to control whether DocumentReference.getDocument() and Query.getDocuments() should fetch from server only, cache only, or attempt server and fall back to the cache (which was the only option previously, and is now the default.)
• [feature] Added new mergeFields:(NSArray<id>*) override for set() which allows merging of a reduced subset of fields.

0.11.0

• [fixed] Fixed a regression in the Firebase iOS SDK release 4.11.0 that could cause getDocument() requests made while offline to be delayed by up to 10 seconds (rather than returning from cache immediately).
• [feature] Added a new Timestamp class to represent timestamp fields, currently supporting up to microsecond precision. It can be passed to API methods anywhere a system Date is currently accepted. To make DocumentSnapshots read timestamp fields back as Timestamps instead of Dates, you can set the newly added property areTimestampsInSnapshotsEnabled in FirestoreSettings to true. Note that the current behavior (DocumentSnapshots returning system Dates) will be removed in a future release. Using Timestamps avoids rounding errors (system Date is stored as a floating-point value, so the value read back from a DocumentSnapshot might be slightly different from the value written).

0.10.4

• [changed] If the SDK's attempt to connect to the Cloud Firestore backend neither succeeds nor fails within 10 seconds, the SDK will consider itself "offline", causing getDocument() calls to resolve with cached results, rather than continuing to wait.
• [fixed] Fixed a race condition after calling enableNetwork() that could result in a "Mutation batchIDs must be acknowledged in order" assertion crash.
• [fixed] Fixed undefined symbols in the absl namespace (#898).

0.10.3

• [fixed] Fixed a regression in the 4.10.0 Firebase iOS SDK release that prevented the SDK from communicating with the backend before successfully authenticating via Firebase Authentication or after unauthenticating and re-authenticating. Reads and writes would silently be executed locally but not sent to the backend.

0.10.2

• [changed] When you delete a FirebaseApp, the associated Firestore instances are now also deleted (#683).
• [fixed] Fixed race conditions in streams that could be exposed by rapidly toggling the network from enabled to disabled and back (#772) or encountering a failure from the server (#835).
• [fixed] Addressed warnings shown by the latest versions of Xcode and CocoaPods.

0.10.1

• [fixed] Fixed a regression in Firebase iOS release 4.8.1 that could in certain cases result in an "OnlineState should not affect limbo documents." assertion crash when the client loses its network connection.
• [fixed] It's now possible to pass a nil completion block to WriteBatch.commit (#745).

0.10.0

• [changed] Removed the includeMetadataChanges property in FIRDocumentListenOptions to avoid confusion with the factory method of the same name.
• [changed] Added a commit method that takes no completion handler to FIRWriteBatch.
• [feature] Queries can now be created from an NSPredicate.
• [feature] Added SnapshotOptions API to control how DocumentSnapshots return unresolved server timestamps.
• [feature] Added disableNetwork() and enableNetwork() methods to Firestore class, allowing for explicit network management.
• [changed] For non-existing documents, DocumentSnapshot.data() now returns nil instead of throwing an exception. A non-nullable QueryDocumentSnapshot is introduced for Queries to reduce the number of nil-checks in your code.
• [changed] Snapshot listeners (with the includeMetadataChanges option enabled) now receive an event with snapshot.metadata.isFromCache set to true if the SDK loses its connection to the backend. A new event with snapshot.metadata.isFromCache set to false will be raised once the connection is restored and the query is in sync with the backend again.
• [fixed] Multiple offline mutations now properly reflected in retrieved documents. Previously, only the last mutation would be visible. (#643)
• [fixed] Fixed a crash in closeWithFinaleState: that could be triggered by signing out when the app didn't have a network connection.

0.9.4

• [changed] Firestore no longer has a direct dependency on FirebaseAuth.
• [fixed] Fixed a crash when using path names with international characters with persistence enabled.
• [fixed] Addressed race condition during the teardown of idle streams (#490).

0.9.3

• [changed] Improved performance loading documents matching a query.
• [changed] Cleanly shut down idle write streams.

0.9.2

• [changed] Firestore now retries requests more often before considering a client offline.
• [changed] You can now use FieldValue.delete() with SetOptions.merge().

0.9.1

• [fixed] Fixed validation of nested arrays to allow indirect nesting.

0.9.0

• [fixed] Add an NS_SWIFT_NAME for FIRSnapshotMetadata and FIRListenerRegistration.
• [fixed] Fixed retain cycle in DocumentReference.getDocument(completion:).

0.8.0

• Initial public release.