Feat: zodern solution to stubvalue promise

packages/ddp-client/common/livedata_connection.js

@@ -893,11 +893,13 @@ export class Connection {
       if (options.returnServerPromise) {
         return future;
       }
-      return options.returnStubValue
-        ? future.then(() => stubReturnValue)
-        : {
-            stubValuePromise: future,
-          };
+
+      if (options.returnStubValue) {
+        return future.then(() => stubReturnValue);
+      }
+      
+      future.stub = stubReturnValue;
+      return future;
     }
     return options.returnStubValue ? stubReturnValue : undefined;
   }

packages/ddp-client/package.js

@@ -60,4 +60,5 @@ Package.onTest((api) => {
   api.addFiles('test/livedata_tests.js');
   api.addFiles('test/livedata_test_service.js');
   api.addFiles('test/random_stream_tests.js');
+  api.addFiles('test/livedata_callAsync_tests.js');
 });

packages/ddp-client/test/livedata_callAsync_tests.js

@@ -0,0 +1,24 @@
+if (Meteor.isServer) {
+  Meteor.methods({
+    "server-only"() {
+      return "result";
+    },
+  });
+}
+
+Meteor.methods({
+  "client-only"() {
+    return "result";
+  },
+});
+
+Tinytest.addAsync(
+  "livedata stub - callAsync works like in 2.x",
+  async function (t) {
+    let result = await Meteor.callAsync("server-only");
+    t.equal(result, "result");
+
+    result = await Meteor.callAsync("client-only");
+    t.equal(result, "result");
+  }
+);