Properly test for IndexedDB availability

drift/lib/src/web/storage.dart

@@ -1,11 +1,11 @@
 import 'dart:html';
 import 'dart:indexed_db';
-import 'dart:js';
 import 'dart:typed_data';
 
 import 'package:meta/meta.dart';
 
 import 'binary_string_conversion.dart';
+import 'wasm_setup/shared.dart';
 
 /// Interface to control how drift should store data on the web.
 abstract class DriftWebStorage {
@@ -70,25 +70,7 @@ abstract class DriftWebStorage {
   /// Attempts to check whether the current browser supports the
   /// [DriftWebStorage.indexedDb] storage implementation.
   static Future<bool> supportsIndexedDb({bool inWebWorker = false}) async {
-    var isIndexedDbSupported = false;
-    if (inWebWorker && WorkerGlobalScope.instance.indexedDB != null) {
-      isIndexedDbSupported = true;
-    } else {
-      try {
-        isIndexedDbSupported = IdbFactory.supported;
-
-        if (isIndexedDbSupported) {
-          // Try opening a mock database to check if IndexedDB is really
-          // available. This avoids the problem with Firefox incorrectly
-          // reporting IndexedDB as supported in private mode.
-          final mockDb = await window.indexedDB!.open('drift_mock_db');
-          mockDb.close();
-        }
-      } catch (error) {
-        isIndexedDbSupported = false;
-      }
-    }
-    return isIndexedDbSupported && context.hasProperty('FileReader');
+    return checkIndexedDbSupport();
   }
 }
 

drift/lib/src/web/wasm_setup.dart

@@ -67,7 +67,8 @@ Future<WasmDatabaseResult> openWasmDatabase({
         await sharedMessages.nextNoError as SharedWorkerStatus;
     missingFeatures.addAll(sharedFeatures.missingFeatures);
 
-    // Can we use the shared OPFS implementation?
+    // Prefer to use the shared worker to host the database if it supports the
+    // necessary APIs.
     if (sharedFeatures.canSpawnDedicatedWorkers &&
         sharedFeatures.dedicatedWorkersCanUseOpfs) {
       return connect(

drift/lib/src/web/wasm_setup/shared.dart

@@ -1,4 +1,5 @@
 import 'dart:html';
+import 'dart:indexed_db';
 
 import 'package:drift/drift.dart';
 import 'package:drift/remote.dart';
@@ -54,7 +55,27 @@ Future<bool> checkOpfsSupport() async {
   }
 }
 
+/// Checks whether IndexedDB is working in the current browser by opening a test
+/// database.
 Future<bool> checkIndexedDbSupport() async {
+  if (!hasProperty(globalThis, 'indexedDB') ||
+      // FileReader needed to read and write blobs efficiently
+      !hasProperty(globalThis, 'FileReader')) {
+    return false;
+  }
+
+  final idb = getProperty<IdbFactory>(globalThis, 'indexedDB');
+
+  try {
+    const name = 'drift_mock_db';
+
+    final mockDb = await idb.open(name);
+    mockDb.close();
+    idb.deleteDatabase(name);
+  } catch (error) {
+    return false;
+  }
+
   return true;
 }