feat(persistence): allow experimental indexedDB on web

packages/stream_chat_persistence/lib/src/db/shared/native_db.dart

@@ -15,11 +15,12 @@ import 'package:stream_chat_persistence/stream_chat_persistence.dart';
 /// specifically for native platform applications.
 class SharedDB {
   /// Returns a new instance of [DriftChatDatabase].
-  static DriftChatDatabase constructDatabase(
+  static Future<DriftChatDatabase> constructDatabase(
     String userId, {
     bool logStatements = false,
     ConnectionMode connectionMode = ConnectionMode.regular,
-  }) {
+    bool webUseIndexedDbIfSupported = false, // Ignored on native
+  }) async {
     final dbName = 'db_$userId';
     if (connectionMode == ConnectionMode.background) {
       return DriftChatDatabase.connect(

packages/stream_chat_persistence/lib/src/db/shared/unsupported_db.dart

@@ -5,10 +5,11 @@ import 'package:stream_chat_persistence/stream_chat_persistence.dart';
 /// A Helper class to construct new instances of [DriftChatDatabase]
 class SharedDB {
   /// Returns a new instance of [DriftChatDatabase].
-  static DriftChatDatabase constructDatabase(
+  static Future<DriftChatDatabase> constructDatabase(
     String userId, {
     bool logStatements = false,
     ConnectionMode connectionMode = ConnectionMode.regular,
+    bool webUseIndexedDbIfSupported = false,
   }) {
     throw UnsupportedError(
       'No implementation of the constructDatabase api provided',

packages/stream_chat_persistence/lib/src/db/shared/web_db.dart

@@ -7,13 +7,32 @@ import 'package:stream_chat_persistence/src/stream_chat_persistence_client.dart'
 /// specifically for Web applications.
 class SharedDB {
   /// Returns a new instance of [DriftChatDatabase].
-  static DriftChatDatabase constructDatabase(
+  static Future<DriftChatDatabase> constructDatabase(
     String userId, {
     bool logStatements = false,
     ConnectionMode connectionMode = ConnectionMode.regular, // Ignored on web
-  }) {
+    bool webUseIndexedDbIfSupported = false,
+  }) async {
     final dbName = 'db_$userId';
-    final queryExecutor = WebDatabase(dbName, logStatements: logStatements);
+    final queryExecutor = await _getQueryExecutor(
+      dbName,
+      useIndexedDbIfSupported: webUseIndexedDbIfSupported,
+      logStatements: logStatements,
+    );
     return DriftChatDatabase(userId, queryExecutor);
   }
+
+  static Future<WebDatabase> _getQueryExecutor(
+    String dbName, {
+    required bool useIndexedDbIfSupported,
+    required bool logStatements,
+  }) async {
+    if (useIndexedDbIfSupported) {
+      return WebDatabase.withStorage(
+        await DriftWebStorage.indexedDbIfSupported(dbName),
+        logStatements: logStatements,
+      );
+    }
+    return WebDatabase(dbName, logStatements: logStatements);
+  }
 }