Restore web support

Author: simolus3

demos/supabase-todolist/lib/attachments/local_storage_native.dart

@@ -0,0 +1,8 @@
+import 'package:path_provider/path_provider.dart';
+import 'package:powersync_core/attachments/attachments.dart';
+import 'package:powersync_core/attachments/io.dart';
+
+Future<LocalStorage> localAttachmentStorage() async {
+  final appDocDir = await getApplicationDocumentsDirectory();
+  return IOLocalStorage(appDocDir);
+}

demos/supabase-todolist/lib/attachments/local_storage_unsupported.dart

@@ -0,0 +1,7 @@
+import 'package:powersync_core/attachments/attachments.dart';
+
+Future<LocalStorage> localAttachmentStorage() async {
+  // This file is imported on the web, where we don't currently have a
+  // persistent local storage implementation.
+  return LocalStorage.inMemory();
+}

demos/supabase-todolist/lib/attachments/queue.dart

@@ -1,27 +1,24 @@
 import 'dart:async';
-import 'dart:io';
 
 import 'package:logging/logging.dart';
-import 'package:path_provider/path_provider.dart';
 import 'package:powersync/powersync.dart';
 import 'package:powersync_core/attachments/attachments.dart';
-import 'package:powersync_core/attachments/io.dart';
 
 import 'package:powersync_flutter_demo/attachments/remote_storage_adapter.dart';
 
+import 'local_storage_unsupported.dart'
+    if (dart.library.io) 'local_storage_native.dart';
+
 late AttachmentQueue attachmentQueue;
 final remoteStorage = SupabaseStorageAdapter();
 final logger = Logger('AttachmentQueue');
 
 Future<void> initializeAttachmentQueue(PowerSyncDatabase db) async {
-  // Use the app's document directory for local storage
-  final Directory appDocDir = await getApplicationDocumentsDirectory();
-
   attachmentQueue = AttachmentQueue(
     db: db,
     remoteStorage: remoteStorage,
     logger: logger,
-    localStorage: IOLocalStorage(appDocDir),
+    localStorage: await localAttachmentStorage(),
     watchAttachments: () => db.watch('''
       SELECT photo_id as id FROM todos WHERE photo_id IS NOT NULL
     ''').map(

packages/powersync_core/test/attachments/attachment_test.dart

@@ -24,7 +24,8 @@ void main() {
         .map(
           (rs) => [
             for (final row in rs)
-              WatchedAttachmentItem(id: row[0] as String, fileExtension: 'jpg')
+              WatchedAttachmentItem(
+                  id: row['photo_id'] as String, fileExtension: 'jpg')
           ],
         );
   }