Initial commit

lib/shared/utils/async_lock.dart

@@ -0,0 +1,20 @@
+import 'dart:async';
+
+
+class AsyncLock {
+  Future<void>? _lastOp;
+
+  Future<T> run<T>(Future<T> Function() action) async {
+    final previous = _lastOp;
+    final completer = Completer<void>();
+    _lastOp = completer.future;
+    if (previous != null) {
+      await previous;
+    }
+    try {
+      return await action();
+    } finally {
+      completer.complete();
+    }
+  }
+}