Support lock-based OPFS implementation in worker

drift/lib/src/web/wasm_setup.dart

@@ -88,8 +88,11 @@ Future<WasmDatabaseResult> openWasmDatabase({
       await workerMessages.next as DedicatedWorkerCompatibilityResult;
   missingFeatures.addAll(status.missingFeatures);
 
-  if (status.canAccessOpfs && status.supportsSharedArrayBuffers) {
+  if (status.supportsNestedWorkers &&
-    // todo send second worker to first one
+      status.canAccessOpfs &&
+      status.supportsSharedArrayBuffers) {
+    return connect(WasmStorageImplementation.opfsLocks,
+        (msg) => msg.sendToWorker(dedicatedWorker));
   } else if (status.supportsIndexedDb) {
     return connect(WasmStorageImplementation.unsafeIndexedDb,
         (msg) => msg.sendToWorker(dedicatedWorker));
@@ -105,6 +108,4 @@ Future<WasmDatabaseResult> openWasmDatabase({
       missingFeatures,
     );
   }
-
-  throw 'todo';
 }

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

@@ -35,6 +35,7 @@ class DedicatedDriftWorker {
         final supportsIndexedDb = await checkIndexedDbSupport();
 
         DedicatedWorkerCompatibilityResult(
+          supportsNestedWorkers: hasProperty(globalThis, 'Worker'),
           canAccessOpfs: supportsOpfs,
           supportsIndexedDb: supportsIndexedDb,
           supportsSharedArrayBuffers:
@@ -64,7 +65,9 @@ class DedicatedDriftWorker {
         });
 
         server.serve(message.port.channel());
-        break;
+      case StartFileSystemServer(sqlite3Options: final options):
+        final worker = await VfsWorker.create(options);
+        await worker.start();
       default:
         break;
     }

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

@@ -173,11 +173,13 @@ final class DedicatedWorkerCompatibilityResult
     extends WasmInitializationMessage {
   static const type = 'DedicatedWorkerCompatibilityResult';
 
+  final bool supportsNestedWorkers;
   final bool canAccessOpfs;
   final bool supportsSharedArrayBuffers;
   final bool supportsIndexedDb;
 
   DedicatedWorkerCompatibilityResult({
+    required this.supportsNestedWorkers,
     required this.canAccessOpfs,
     required this.supportsSharedArrayBuffers,
     required this.supportsIndexedDb,
@@ -185,6 +187,7 @@ final class DedicatedWorkerCompatibilityResult
 
   factory DedicatedWorkerCompatibilityResult.fromJsPayload(Object payload) {
     return DedicatedWorkerCompatibilityResult(
+      supportsNestedWorkers: getProperty(payload, 'supportsNestedWorkers'),
       canAccessOpfs: getProperty(payload, 'canAccessOpfs'),
       supportsSharedArrayBuffers:
           getProperty(payload, 'supportsSharedArrayBuffers'),
@@ -195,6 +198,8 @@ final class DedicatedWorkerCompatibilityResult
   @override
   void _send(_PostMessage sender) {
     final object = newObject<Object>();
+
+    setProperty(object, 'supportsNestedWorkers', supportsNestedWorkers);
     setProperty(object, 'canAccessOpfs', canAccessOpfs);
     setProperty(object, 'supportsIndexedDb', supportsIndexedDb);
     setProperty(

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

@@ -6,7 +6,6 @@ import 'package:drift/wasm.dart';
 import 'package:js/js_util.dart';
 
 import 'protocol.dart';
-import 'shared.dart';
 
 class SharedDriftWorker {
   final SharedWorkerGlobalScope self;