diff --git a/lib/encryption/utils/key_verification.dart b/lib/encryption/utils/key_verification.dart
index 35cc121f..33963621 100644
--- a/lib/encryption/utils/key_verification.dart
+++ b/lib/encryption/utils/key_verification.dart
@@ -748,9 +748,10 @@ class KeyVerification {
       // no need to request cache, we already have it
       return;
     }
-    // ignore: unawaited_futures
-    encryption.ssss
-        .maybeRequestAll(_verifiedDevices.whereType<DeviceKeys>().toList());
+    unawaited(
+      encryption.ssss
+          .maybeRequestAll(_verifiedDevices.whereType<DeviceKeys>().toList()),
+    );
     if (requestInterval.length <= i) {
       return;
     }
diff --git a/lib/matrix.dart b/lib/matrix.dart
index da5aadeb..8ad93add 100644
--- a/lib/matrix.dart
+++ b/lib/matrix.dart
@@ -84,7 +84,7 @@ export 'msc_extensions/extension_timeline_export/timeline_export.dart';
 export 'msc_extensions/msc_4140_delayed_events/api.dart';
 
 export 'src/utils/web_worker/web_worker_stub.dart'
-    if (dart.library.html) 'src/utils/web_worker/web_worker.dart';
+    if (dart.library.js_interop) 'src/utils/web_worker/web_worker.dart';
 
 export 'src/utils/web_worker/native_implementations_web_worker_stub.dart'
-    if (dart.library.html) 'src/utils/web_worker/native_implementations_web_worker.dart';
+    if (dart.library.js_interop) 'src/utils/web_worker/native_implementations_web_worker.dart';
diff --git a/lib/matrix_api_lite/utils/logs.dart b/lib/matrix_api_lite/utils/logs.dart
index 495194cd..ff266686 100644
--- a/lib/matrix_api_lite/utils/logs.dart
+++ b/lib/matrix_api_lite/utils/logs.dart
@@ -22,7 +22,7 @@
 */
 
 import 'package:matrix/matrix_api_lite/utils/print_logs_native.dart'
-    if (dart.library.html) 'print_logs_web.dart';
+    if (dart.library.js_interop) 'print_logs_web.dart';
 
 enum Level {
   wtf,
diff --git a/lib/matrix_api_lite/utils/print_logs_web.dart b/lib/matrix_api_lite/utils/print_logs_web.dart
index b24ffd4b..c1e83379 100644
--- a/lib/matrix_api_lite/utils/print_logs_web.dart
+++ b/lib/matrix_api_lite/utils/print_logs_web.dart
@@ -1,4 +1,6 @@
-import 'dart:html';
+import 'dart:js_interop';
+
+import 'package:web/web.dart';
 
 import 'package:matrix/matrix_api_lite.dart';
 
@@ -13,22 +15,22 @@ extension PrintLogs on LogEvent {
     }
     switch (level) {
       case Level.wtf:
-        window.console.error('!!!CRITICAL!!! $logsStr');
+        console.error('!!!CRITICAL!!! $logsStr'.toJS);
         break;
       case Level.error:
-        window.console.error(logsStr);
+        console.error(logsStr.toJS);
         break;
       case Level.warning:
-        window.console.warn(logsStr);
+        console.warn(logsStr.toJS);
         break;
       case Level.info:
-        window.console.info(logsStr);
+        console.info(logsStr.toJS);
         break;
       case Level.debug:
-        window.console.debug(logsStr);
+        console.debug(logsStr.toJS);
         break;
       case Level.verbose:
-        window.console.log(logsStr);
+        console.log(logsStr.toJS);
         break;
     }
   }
diff --git a/lib/src/database/indexeddb_box.dart b/lib/src/database/indexeddb_box.dart
index 080b1ad5..5726cb0e 100644
--- a/lib/src/database/indexeddb_box.dart
+++ b/lib/src/database/indexeddb_box.dart
@@ -1,13 +1,15 @@
 import 'dart:async';
-import 'dart:html';
-import 'dart:indexed_db';
+import 'dart:js_interop';
 
+import 'package:web/web.dart';
+
+import 'package:matrix/matrix_api_lite/utils/logs.dart';
 import 'package:matrix/src/database/zone_transaction_mixin.dart';
 
 /// Key-Value store abstraction over IndexedDB so that the sdk database can use
 /// a single interface for all platforms. API is inspired by Hive.
 class BoxCollection with ZoneTransactionMixin {
-  final Database _db;
+  final IDBDatabase _db;
   final Set<String> boxNames;
   final String name;
 
@@ -18,23 +20,45 @@ class BoxCollection with ZoneTransactionMixin {
     Set<String> boxNames, {
     Object? sqfliteDatabase,
     Object? sqfliteFactory,
-    IdbFactory? idbFactory,
+    IDBFactory? idbFactory,
     int version = 1,
   }) async {
-    idbFactory ??= window.indexedDB!;
-    final db = await idbFactory.open(
-      name,
-      version: version,
-      onUpgradeNeeded: (VersionChangeEvent event) {
-        final db = event.target.result;
-        for (final name in boxNames) {
-          if (db.objectStoreNames.contains(name)) continue;
+    idbFactory ??= window.indexedDB;
+    final dbOpenCompleter = Completer<BoxCollection>();
+    final request = idbFactory.open(name, version);
 
-          db.createObjectStore(name, autoIncrement: true);
-        }
-      },
-    );
-    return BoxCollection(db, boxNames, name);
+    request.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] Error loading database - ${request.error?.toString()}',
+      );
+      dbOpenCompleter.completeError(
+        'Error loading database - ${request.error?.toString()}',
+      );
+    }.toJS;
+
+    request.onupgradeneeded = (IDBVersionChangeEvent event) {
+      final db = (event.target! as IDBOpenDBRequest).result as IDBDatabase;
+
+      db.onerror = (Event event) {
+        Logs().e('[IndexedDBBox] [onupgradeneeded] Error loading database');
+        dbOpenCompleter
+            .completeError('Error loading database onupgradeneeded.');
+      }.toJS;
+
+      for (final name in boxNames) {
+        if (db.objectStoreNames.contains(name)) continue;
+        db.createObjectStore(
+          name,
+          IDBObjectStoreParameters(autoIncrement: true),
+        );
+      }
+    }.toJS;
+
+    request.onsuccess = (Event event) {
+      final db = request.result as IDBDatabase;
+      dbOpenCompleter.complete(BoxCollection(db, boxNames, name));
+    }.toJS;
+    return dbOpenCompleter.future;
   }
 
   Box<V> openBox<V>(String name) {
@@ -44,7 +68,7 @@ class BoxCollection with ZoneTransactionMixin {
     return Box<V>(name, this);
   }
 
-  List<Future<void> Function(Transaction txn)>? _txnCache;
+  List<Future<void> Function(IDBTransaction txn)>? _txnCache;
 
   Future<void> transaction(
     Future<void> Function() action, {
@@ -52,15 +76,18 @@ class BoxCollection with ZoneTransactionMixin {
     bool readOnly = false,
   }) =>
       zoneTransaction(() async {
-        boxNames ??= _db.objectStoreNames!.toList();
         final txnCache = _txnCache = [];
         await action();
         final cache =
-            List<Future<void> Function(Transaction txn)>.from(txnCache);
+            List<Future<void> Function(IDBTransaction txn)>.from(txnCache);
         _txnCache = null;
         if (cache.isEmpty) return;
-        final txn =
-            _db.transaction(boxNames, readOnly ? 'readonly' : 'readwrite');
+
+        final transactionCompleter = Completer<void>();
+        final txn = _db.transaction(
+          boxNames?.jsify() ?? _db.objectStoreNames,
+          readOnly ? 'readonly' : 'readwrite',
+        );
         for (final fun in cache) {
           // The IDB methods return a Future in Dart but must not be awaited in
           // order to have an actual transaction. They must only be performed and
@@ -69,16 +96,54 @@ class BoxCollection with ZoneTransactionMixin {
           // https://developer.mozilla.org/en-US/docs/Web/API/IDBTransaction
           unawaited(fun(txn));
         }
-        await txn.completed;
-        return;
+
+        txn.onerror = (Event event) {
+          Logs().e(
+            '[IndexedDBBox] [transaction] Error - ${txn.error?.toString()}',
+          );
+          transactionCompleter.completeError(
+            'Transaction not completed due to an error - ${txn.error?.toString()}'
+                .toJS,
+          );
+        }.toJS;
+
+        txn.oncomplete = (Event event) {
+          transactionCompleter.complete();
+        }.toJS;
+        return transactionCompleter.future;
       });
 
   Future<void> clear() async {
-    final txn = _db.transaction(boxNames.toList(), 'readwrite');
+    final transactionCompleter = Completer();
+    final txn = _db.transaction(boxNames.toList().jsify()!, 'readwrite');
     for (final name in boxNames) {
-      unawaited(txn.objectStore(name).clear());
+      final objStoreClearCompleter = Completer();
+      final request = txn.objectStore(name).clear();
+      request.onerror = (Event event) {
+        Logs().e(
+          '[IndexedDBBox] [clear] Object store clear error - ${request.error?.toString()}',
+        );
+        objStoreClearCompleter.completeError(
+          'Object store clear not completed due to an error - ${request.error?.toString()}'
+              .toJS,
+        );
+      }.toJS;
+      request.onsuccess = (Event event) {
+        objStoreClearCompleter.complete();
+      }.toJS;
+      unawaited(objStoreClearCompleter.future);
     }
-    await txn.completed;
+    txn.onerror = (Event event) {
+      Logs().e('[IndexedDBBox] [clear] Error - ${txn.error?.toString()}');
+      transactionCompleter.completeError(
+        'DB clear transaction not completed due to an error - ${txn.error?.toString()}'
+            .toJS,
+      );
+    }.toJS;
+    txn.oncomplete = (Event event) {
+      transactionCompleter.complete();
+    }.toJS;
+    return transactionCompleter.future;
   }
 
   Future<void> close() async {
@@ -87,13 +152,24 @@ class BoxCollection with ZoneTransactionMixin {
     return zoneTransaction(() async => _db.close());
   }
 
-  @Deprecated('use collection.deleteDatabase now')
-  static Future<void> delete(String name, [dynamic factory]) =>
-      (factory ?? window.indexedDB!).deleteDatabase(name);
-
   Future<void> deleteDatabase(String name, [dynamic factory]) async {
     await close();
-    await (factory ?? window.indexedDB).deleteDatabase(name);
+    final deleteDatabaseCompleter = Completer();
+    final request =
+        ((factory ?? window.indexedDB) as IDBFactory).deleteDatabase(name);
+    request.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] [deleteDatabase] Error - ${request.error?.toString()}',
+      );
+      deleteDatabaseCompleter.completeError(
+        'Error deleting database - ${request.error?.toString()}'.toJS,
+      );
+    }.toJS;
+    request.onsuccess = (Event event) {
+      Logs().i('[IndexedDBBox] [deleteDatabase] Database deleted.');
+      deleteDatabaseCompleter.complete();
+    }.toJS;
+    return deleteDatabaseCompleter.future;
   }
 }
 
@@ -111,44 +187,109 @@ class Box<V> {
 
   Box(this.name, this.boxCollection);
 
-  Future<List<String>> getAllKeys([Transaction? txn]) async {
+  Future<List<String>> getAllKeys([IDBTransaction? txn]) async {
     if (_quickAccessCachedKeys != null) return _quickAccessCachedKeys!.toList();
-    txn ??= boxCollection._db.transaction(name, 'readonly');
+    txn ??= boxCollection._db.transaction(name.toJS, 'readonly');
     final store = txn.objectStore(name);
-    final request = store.getAllKeys(null);
-    await request.onSuccess.first;
-    final keys = request.result.cast<String>();
+    final getAllKeysCompleter = Completer();
+    final request = store.getAllKeys();
+    request.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] [getAllKeys] Error - ${request.error?.toString()}',
+      );
+      getAllKeysCompleter.completeError(
+        '[IndexedDBBox] [getAllKeys] Error - ${request.error?.toString()}'.toJS,
+      );
+    }.toJS;
+    request.onsuccess = (Event event) {
+      getAllKeysCompleter.complete();
+    }.toJS;
+    await getAllKeysCompleter.future;
+    final keys = (request.result?.dartify() as List?)?.cast<String>() ?? [];
     _quickAccessCachedKeys = keys.toSet();
     return keys;
   }
 
-  Future<Map<String, V>> getAllValues([Transaction? txn]) async {
-    txn ??= boxCollection._db.transaction(name, 'readonly');
+  Future<Map<String, V>> getAllValues([IDBTransaction? txn]) async {
+    txn ??= boxCollection._db.transaction(name.toJS, 'readonly');
     final store = txn.objectStore(name);
     final map = <String, V>{};
-    final cursorStream = store.openCursor(autoAdvance: true);
-    await for (final cursor in cursorStream) {
-      map[cursor.key as String] = _fromValue(cursor.value) as V;
-    }
+
+    /// NOTE: This is a workaround to get the keys as [IDBObjectStore.getAll()]
+    /// only returns the values as a list.
+    /// And using the [IDBObjectStore.openCursor()] method is not working as expected.
+    final keys = await getAllKeys(txn);
+
+    final getAllValuesCompleter = Completer();
+    final getAllValuesRequest = store.getAll();
+    getAllValuesRequest.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] [getAllValues] Error - ${getAllValuesRequest.error?.toString()}',
+      );
+      getAllValuesCompleter.completeError(
+        '[IndexedDBBox] [getAllValues] Error - ${getAllValuesRequest.error?.toString()}'
+            .toJS,
+      );
+    }.toJS;
+    getAllValuesRequest.onsuccess = (Event event) {
+      final values = getAllValuesRequest.result.dartify() as List;
+      for (int i = 0; i < values.length; i++) {
+        map[keys[i]] = _fromValue(values[i]) as V;
+      }
+      getAllValuesCompleter.complete();
+    }.toJS;
+    await getAllValuesCompleter.future;
     return map;
   }
 
-  Future<V?> get(String key, [Transaction? txn]) async {
+  Future<V?> get(String key, [IDBTransaction? txn]) async {
     if (_quickAccessCache.containsKey(key)) return _quickAccessCache[key];
-    txn ??= boxCollection._db.transaction(name, 'readonly');
+    txn ??= boxCollection._db.transaction(name.toJS, 'readonly');
     final store = txn.objectStore(name);
-    _quickAccessCache[key] = await store.getObject(key).then(_fromValue);
+    final getObjectRequest = store.get(key.toJS);
+    final getObjectCompleter = Completer();
+    getObjectRequest.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] [get] Error - ${getObjectRequest.error?.toString()}',
+      );
+      getObjectCompleter.completeError(
+        '[IndexedDBBox] [get] Error - ${getObjectRequest.error?.toString()}'
+            .toJS,
+      );
+    }.toJS;
+    getObjectRequest.onsuccess = (Event event) {
+      getObjectCompleter.complete();
+    }.toJS;
+    await getObjectCompleter.future;
+    _quickAccessCache[key] = _fromValue(getObjectRequest.result?.dartify());
     return _quickAccessCache[key];
   }
 
-  Future<List<V?>> getAll(List<String> keys, [Transaction? txn]) async {
+  Future<List<V?>> getAll(List<String> keys, [IDBTransaction? txn]) async {
     if (keys.every((key) => _quickAccessCache.containsKey(key))) {
       return keys.map((key) => _quickAccessCache[key]).toList();
     }
-    txn ??= boxCollection._db.transaction(name, 'readonly');
+    txn ??= boxCollection._db.transaction(name.toJS, 'readonly');
     final store = txn.objectStore(name);
     final list = await Future.wait(
-      keys.map((key) => store.getObject(key).then(_fromValue)),
+      keys.map((key) async {
+        final getObjectRequest = store.get(key.toJS);
+        final getObjectCompleter = Completer();
+        getObjectRequest.onerror = (Event event) {
+          Logs().e(
+            '[IndexedDBBox] [getAll] Error at key $key - ${getObjectRequest.error?.toString()}',
+          );
+          getObjectCompleter.completeError(
+            '[IndexedDBBox] [getAll] Error at key $key - ${getObjectRequest.error?.toString()}'
+                .toJS,
+          );
+        }.toJS;
+        getObjectRequest.onsuccess = (Event event) {
+          getObjectCompleter.complete();
+        }.toJS;
+        await getObjectCompleter.future;
+        return _fromValue(getObjectRequest.result?.dartify());
+      }),
     );
     for (var i = 0; i < keys.length; i++) {
       _quickAccessCache[keys[i]] = list[i];
@@ -156,7 +297,7 @@ class Box<V> {
     return list;
   }
 
-  Future<void> put(String key, V val, [Transaction? txn]) async {
+  Future<void> put(String key, V val, [IDBTransaction? txn]) async {
     if (boxCollection._txnCache != null) {
       boxCollection._txnCache!.add((txn) => put(key, val, txn));
       _quickAccessCache[key] = val;
@@ -164,15 +305,28 @@ class Box<V> {
       return;
     }
 
-    txn ??= boxCollection._db.transaction(name, 'readwrite');
+    txn ??= boxCollection._db.transaction(name.toJS, 'readwrite');
     final store = txn.objectStore(name);
-    await store.put(val as Object, key);
+    final putRequest = store.put(val.jsify(), key.toJS);
+    final putCompleter = Completer();
+    putRequest.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] [put] Error - ${putRequest.error?.toString()}',
+      );
+      putCompleter.completeError(
+        '[IndexedDBBox] [put] Error - ${putRequest.error?.toString()}'.toJS,
+      );
+    }.toJS;
+    putRequest.onsuccess = (Event event) {
+      putCompleter.complete();
+    }.toJS;
+    await putCompleter.future;
     _quickAccessCache[key] = val;
     _quickAccessCachedKeys?.add(key);
     return;
   }
 
-  Future<void> delete(String key, [Transaction? txn]) async {
+  Future<void> delete(String key, [IDBTransaction? txn]) async {
     if (boxCollection._txnCache != null) {
       boxCollection._txnCache!.add((txn) => delete(key, txn));
       _quickAccessCache[key] = null;
@@ -180,9 +334,23 @@ class Box<V> {
       return;
     }
 
-    txn ??= boxCollection._db.transaction(name, 'readwrite');
+    txn ??= boxCollection._db.transaction(name.toJS, 'readwrite');
     final store = txn.objectStore(name);
-    await store.delete(key);
+    final deleteRequest = store.delete(key.toJS);
+    final deleteCompleter = Completer();
+    deleteRequest.onerror = (Event event) {
+      Logs().e(
+        '[IndexedDBBox] [delete] Error - ${deleteRequest.error?.toString()}',
+      );
+      deleteCompleter.completeError(
+        '[IndexedDBBox] [delete] Error - ${deleteRequest.error?.toString()}'
+            .toJS,
+      );
+    }.toJS;
+    deleteRequest.onsuccess = (Event event) {
+      deleteCompleter.complete();
+    }.toJS;
+    await deleteCompleter.future;
 
     // Set to null instead remove() so that inside of transactions null is
     // returned.
@@ -191,7 +359,7 @@ class Box<V> {
     return;
   }
 
-  Future<void> deleteAll(List<String> keys, [Transaction? txn]) async {
+  Future<void> deleteAll(List<String> keys, [IDBTransaction? txn]) async {
     if (boxCollection._txnCache != null) {
       boxCollection._txnCache!.add((txn) => deleteAll(keys, txn));
       for (final key in keys) {
@@ -201,10 +369,24 @@ class Box<V> {
       return;
     }
 
-    txn ??= boxCollection._db.transaction(name, 'readwrite');
+    txn ??= boxCollection._db.transaction(name.toJS, 'readwrite');
     final store = txn.objectStore(name);
     for (final key in keys) {
-      await store.delete(key);
+      final deleteRequest = store.delete(key.toJS);
+      final deleteCompleter = Completer();
+      deleteRequest.onerror = (Event event) {
+        Logs().e(
+          '[IndexedDBBox] [deleteAll] Error at key $key - ${deleteRequest.error?.toString()}',
+        );
+        deleteCompleter.completeError(
+          '[IndexedDBBox] [deleteAll] Error at key $key - ${deleteRequest.error?.toString()}'
+              .toJS,
+        );
+      }.toJS;
+      deleteRequest.onsuccess = (Event event) {
+        deleteCompleter.complete();
+      }.toJS;
+      await deleteCompleter.future;
       _quickAccessCache[key] = null;
       _quickAccessCachedKeys?.remove(key);
     }
@@ -216,15 +398,28 @@ class Box<V> {
     _quickAccessCachedKeys = null;
   }
 
-  Future<void> clear([Transaction? txn]) async {
+  Future<void> clear([IDBTransaction? txn]) async {
     if (boxCollection._txnCache != null) {
       boxCollection._txnCache!.add((txn) => clear(txn));
     } else {
-      txn ??= boxCollection._db.transaction(name, 'readwrite');
+      txn ??= boxCollection._db.transaction(name.toJS, 'readwrite');
       final store = txn.objectStore(name);
-      await store.clear();
+      final clearRequest = store.clear();
+      final clearCompleter = Completer();
+      clearRequest.onerror = (Event event) {
+        Logs().e(
+          '[IndexedDBBox] [clear] Error - ${clearRequest.error?.toString()}',
+        );
+        clearCompleter.completeError(
+          '[IndexedDBBox] [clear] Error - ${clearRequest.error?.toString()}'
+              .toJS,
+        );
+      }.toJS;
+      clearRequest.onsuccess = (Event event) {
+        clearCompleter.complete();
+      }.toJS;
+      await clearCompleter.future;
     }
-
     clearQuickAccessCache();
   }
 
diff --git a/lib/src/database/matrix_sdk_database.dart b/lib/src/database/matrix_sdk_database.dart
index 942418b8..fc2ddeaf 100644
--- a/lib/src/database/matrix_sdk_database.dart
+++ b/lib/src/database/matrix_sdk_database.dart
@@ -31,8 +31,8 @@ import 'package:matrix/src/utils/copy_map.dart';
 import 'package:matrix/src/utils/queued_to_device_event.dart';
 import 'package:matrix/src/utils/run_benchmarked.dart';
 
-import 'package:matrix/src/database/indexeddb_box.dart'
-    if (dart.library.io) 'package:matrix/src/database/sqflite_box.dart';
+import 'package:matrix/src/database/sqflite_box.dart'
+    if (dart.library.js_interop) 'package:matrix/src/database/indexeddb_box.dart';
 
 import 'package:matrix/src/database/database_file_storage_stub.dart'
     if (dart.library.io) 'package:matrix/src/database/database_file_storage_io.dart';
@@ -167,8 +167,8 @@ class MatrixSdkDatabase extends DatabaseApi with DatabaseFileStorage {
 
   Database? database;
 
-  /// Custom IdbFactory used to create the indexedDB. On IO platforms it would
-  /// lead to an error to import "dart:indexed_db" so this is dynamically
+  /// Custom [IDBFactory] used to create the indexedDB. On IO platforms it would
+  /// lead to an error to import "package:web/web.dart" so this is dynamically
   /// typed.
   final dynamic idbFactory;
 
diff --git a/lib/src/utils/crypto/crypto.dart b/lib/src/utils/crypto/crypto.dart
index a97417ee..c8137934 100644
--- a/lib/src/utils/crypto/crypto.dart
+++ b/lib/src/utils/crypto/crypto.dart
@@ -16,7 +16,7 @@
  *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-export 'native.dart' if (dart.library.js) 'js.dart';
+export 'native.dart' if (dart.library.js_interop) 'js.dart';
 
 import 'dart:math';
 import 'dart:typed_data';
diff --git a/lib/src/utils/web_worker/native_implementations_web_worker.dart b/lib/src/utils/web_worker/native_implementations_web_worker.dart
index 6cd71a69..260eb45a 100644
--- a/lib/src/utils/web_worker/native_implementations_web_worker.dart
+++ b/lib/src/utils/web_worker/native_implementations_web_worker.dart
@@ -1,9 +1,11 @@
 import 'dart:async';
 import 'dart:collection';
-import 'dart:html';
+import 'dart:js_interop';
 import 'dart:math';
 import 'dart:typed_data';
 
+import 'package:web/web.dart';
+
 import 'package:matrix/matrix.dart';
 
 class NativeImplementationsWebWorker extends NativeImplementations {
@@ -23,8 +25,8 @@ class NativeImplementationsWebWorker extends NativeImplementations {
     Uri href, {
     this.timeout = const Duration(seconds: 30),
     this.onStackTrace = defaultStackTraceHandler,
-  }) : worker = Worker(href.toString()) {
-    worker.onMessage.listen(_handleIncomingMessage);
+  }) : worker = Worker(href.toString().toJS) {
+    worker.onmessage = _handleIncomingMessage.toJS;
   }
 
   Future<T> operation<T, U>(WebWorkerOperations name, U argument) async {
@@ -32,27 +34,26 @@ class NativeImplementationsWebWorker extends NativeImplementations {
     final completer = Completer<T>();
     _completers[label] = completer;
     final message = WebWorkerData(label, name, argument);
-    worker.postMessage(message.toJson());
+    worker.postMessage(message.toJson().jsify());
 
     return completer.future.timeout(timeout);
   }
 
-  Future<void> _handleIncomingMessage(MessageEvent event) async {
-    final data = event.data;
+  void _handleIncomingMessage(MessageEvent event) async {
+    final data = event.data.dartify() as LinkedHashMap;
     // don't forget handling errors of our second thread...
     if (data['label'] == 'stacktrace') {
-      final origin = event.data['origin'];
+      final origin = data['origin'];
       final completer = _completers[origin];
 
-      final error = event.data['error']!;
+      final error = data['error']!;
 
-      final stackTrace =
-          await onStackTrace.call(event.data['stacktrace'] as String);
+      final stackTrace = await onStackTrace.call(data['stacktrace'] as String);
       completer?.completeError(
         WebWorkerError(error: error, stackTrace: stackTrace),
       );
     } else {
-      final response = WebWorkerData.fromJson(event.data);
+      final response = WebWorkerData.fromJson(data);
       _completers[response.label]!.complete(response.data);
     }
   }
diff --git a/lib/src/utils/web_worker/web_worker.dart b/lib/src/utils/web_worker/web_worker.dart
index 89180856..64f7aca6 100644
--- a/lib/src/utils/web_worker/web_worker.dart
+++ b/lib/src/utils/web_worker/web_worker.dart
@@ -1,13 +1,11 @@
 // ignore_for_file: avoid_print
 
 import 'dart:async';
-import 'dart:html';
-import 'dart:indexed_db';
-import 'dart:js';
+import 'dart:collection';
+import 'dart:js_interop';
 import 'dart:typed_data';
 
-import 'package:js/js.dart';
-import 'package:js/js_util.dart';
+import 'package:web/web.dart';
 
 import 'package:matrix/matrix.dart' hide Event;
 import 'package:matrix/src/utils/web_worker/native_implementations_web_worker.dart';
@@ -32,63 +30,73 @@ import 'package:matrix/src/utils/web_worker/native_implementations_web_worker.da
 /// the web worker in your CI pipeline.
 ///
 
+DedicatedWorkerGlobalScope get _workerScope =>
+    (globalContext as DedicatedWorkerGlobalScope).self
+        as DedicatedWorkerGlobalScope;
+
 @pragma('dart2js:tryInline')
 Future<void> startWebWorker() async {
-  print('[native implementations worker]: Starting...');
-  setProperty(
-    context['self'] as Object,
-    'onmessage',
-    allowInterop(
-      (MessageEvent event) async {
-        final data = event.data;
-        try {
-          final operation = WebWorkerData.fromJson(data);
-          switch (operation.name) {
-            case WebWorkerOperations.shrinkImage:
-              final result = MatrixImageFile.resizeImplementation(
-                MatrixImageFileResizeArguments.fromJson(
-                  Map.from(operation.data as Map),
-                ),
-              );
-              sendResponse(operation.label as double, result?.toJson());
-              break;
-            case WebWorkerOperations.calcImageMetadata:
-              final result = MatrixImageFile.calcMetadataImplementation(
-                Uint8List.fromList(
-                  (operation.data as JsArray).whereType<int>().toList(),
-                ),
-              );
-              sendResponse(operation.label as double, result?.toJson());
-              break;
-            default:
-              throw TypeError();
-          }
-        } on Event catch (e, s) {
-          allowInterop(_replyError)
-              .call((e.target as Request).error, s, data['label'] as double);
-        } catch (e, s) {
-          allowInterop(_replyError).call(e, s, data['label'] as double);
-        }
-      },
-    ),
-  );
+  Logs().i('[native implementations worker]: Starting...');
+  _workerScope.onmessage = (MessageEvent event) {
+    final data = event.data.dartify() as LinkedHashMap;
+    try {
+      final operation = WebWorkerData.fromJson(data);
+      switch (operation.name) {
+        case WebWorkerOperations.shrinkImage:
+          final result = MatrixImageFile.resizeImplementation(
+            MatrixImageFileResizeArguments.fromJson(
+              Map.from(operation.data as Map),
+            ),
+          );
+          _sendResponse(
+            operation.label as double,
+            result?.toJson(),
+          );
+          break;
+        case WebWorkerOperations.calcImageMetadata:
+          final result = MatrixImageFile.calcMetadataImplementation(
+            Uint8List.fromList(
+              (operation.data as List).whereType<int>().toList(),
+            ),
+          );
+          _sendResponse(
+            operation.label as double,
+            result?.toJson(),
+          );
+          break;
+        default:
+          throw TypeError();
+      }
+    } catch (e, s) {
+      _replyError(e, s, data['label'] as double);
+    }
+  }.toJS;
 }
 
-void sendResponse(double label, dynamic response) {
+void _sendResponse(
+  double label,
+  dynamic response,
+) {
   try {
-    self.postMessage({
-      'label': label,
-      'data': response,
-    });
+    _workerScope.postMessage(
+      {
+        'label': label,
+        'data': response,
+      }.jsify(),
+    );
   } catch (e, s) {
-    print('[native implementations worker] Error responding: $e, $s');
+    Logs().e('[native implementations worker] Error responding: $e, $s');
   }
 }
 
-void _replyError(Object? error, StackTrace stackTrace, double origin) {
+void _replyError(
+  Object? error,
+  StackTrace stackTrace,
+  double origin,
+) {
   if (error != null) {
     try {
-      final jsError = jsify(error);
+      final jsError = error.jsify();
       if (jsError != null) {
         error = jsError;
       }
@@ -97,24 +105,15 @@ void _replyError(Object? error, StackTrace stackTrace, double origin) {
     }
   }
   try {
-    self.postMessage({
-      'label': 'stacktrace',
-      'origin': origin,
-      'error': error,
-      'stacktrace': stackTrace.toString(),
-    });
+    _workerScope.postMessage(
+      {
+        'label': 'stacktrace',
+        'origin': origin,
+        'error': error,
+        'stacktrace': stackTrace.toString(),
+      }.jsify(),
+    );
   } catch (e, s) {
-    print('[native implementations worker] Error responding: $e, $s');
-  }
-}
-
-/// represents the [WorkerGlobalScope] the worker currently runs in.
-@JS('self')
-external WorkerGlobalScope get self;
-
-/// adding all missing WebWorker-only properties to the [WorkerGlobalScope]
-extension on WorkerGlobalScope {
-  void postMessage(Object data) {
-    callMethod(self, 'postMessage', [jsify(data)]);
+    Logs().e('[native implementations worker] Error responding: $e, $s');
   }
 }
diff --git a/lib/src/voip/utils/wrapped_media_stream.dart b/lib/src/voip/utils/wrapped_media_stream.dart
index e8eb0f3a..836cb690 100644
--- a/lib/src/voip/utils/wrapped_media_stream.dart
+++ b/lib/src/voip/utils/wrapped_media_stream.dart
@@ -47,7 +47,7 @@ class WrappedMediaStream {
 
   Future<void> dispose() async {
     // AOT it
-    const isWeb = bool.fromEnvironment('dart.library.js_util');
+    const isWeb = bool.fromEnvironment('dart.library.js_interop');
 
     // libwebrtc does not provide a way to clone MediaStreams. So stopping the
     // local stream here would break calls with all other participants if anyone
diff --git a/pubspec.yaml b/pubspec.yaml
index 58922dc9..af0b6f27 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -22,6 +22,7 @@ dependencies:
   http: ">=0.13.0 <2.0.0"
   image: ^4.0.15
   js: ^0.6.3
+  js_interop: ^0.0.1
   markdown: ^7.1.1
   mime: ">=1.0.0 <3.0.0"
   path: ^1.9.1
@@ -32,6 +33,7 @@ dependencies:
   sqlite3: ^2.1.0
   typed_data: ^1.3.2
   vodozemac: ^0.2.0
+  web: ^1.1.1
   webrtc_interface: ^1.2.0
 
 dev_dependencies:
diff --git a/test/box_test.dart b/test/box_test.dart
index 135b2526..e2e733a5 100644
--- a/test/box_test.dart
+++ b/test/box_test.dart
@@ -1,8 +1,8 @@
 import 'package:sqflite_common_ffi/sqflite_ffi.dart';
 import 'package:test/test.dart';
 
-import 'package:matrix/src/database/indexeddb_box.dart'
-    if (dart.library.io) 'package:matrix/src/database/sqflite_box.dart';
+import 'package:matrix/src/database/sqflite_box.dart'
+    if (dart.library.js_interop) 'package:matrix/src/database/indexeddb_box.dart';
 
 void main() {
   group('Box tests', () {
@@ -11,7 +11,7 @@ void main() {
     const data = {'name': 'Fluffy', 'age': 2};
     const data2 = {'name': 'Loki', 'age': 4};
     Database? db;
-    const isWeb = bool.fromEnvironment('dart.library.js_util');
+    const isWeb = bool.fromEnvironment('dart.library.js_interop');
     setUp(() async {
       if (!isWeb) {
         db = await databaseFactoryFfi.openDatabase(':memory:');