fix(rsc-mf): register host callServer in remote action runtime

Author: cursoragent

tests/integration/rsc-mf/host/src/server-component-root/HostRemoteActionRunner.tsx

@@ -1,11 +1,18 @@
 'use client';
 
+import { callServer } from '@modern-js/runtime/rsc/client';
 import { useState } from 'react';
 import RemoteClientBadge from 'rscRemote/RemoteClientBadge';
+import { RemoteClientCounter as RemoteClientCounterBridge } from 'rscRemote/RemoteClientCounter';
 import { remoteActionEcho } from 'rscRemote/actions';
 import defaultRemoteAction from 'rscRemote/defaultAction';
+import { registerRemoteServerCallback } from 'rscRemote/registerServerCallback';
 
 export default function HostRemoteActionRunner() {
+  // Keep this import in the client graph so federated RSC bridge IDs
+  // can map back to a concrete remote module factory at runtime.
+  void RemoteClientCounterBridge;
+  registerRemoteServerCallback(callServer as any);
   const [defaultResult, setDefaultResult] = useState('');
   const [echoResult, setEchoResult] = useState('');
   const [isPending, setIsPending] = useState(false);

tests/integration/rsc-mf/remote/module-federation.config.ts

@@ -155,6 +155,10 @@ export default createModuleFederationConfig({
       import: './src/components/defaultAction.ts',
       layer: LAYERS.rsc,
     } as any,
+    './registerServerCallback': {
+      import: './src/components/registerServerCallback.ts',
+      layer: LAYERS.rsc,
+    } as any,
   },
   shared: sharedByScope as any,
   dts: false,

tests/integration/rsc-mf/remote/src/components/registerServerCallback.ts

@@ -0,0 +1,13 @@
+import { setServerCallback } from 'react-server-dom-rspack/client.browser';
+
+type CallServer = (id: string, args: unknown[]) => Promise<unknown>;
+
+let hasRegisteredRemoteServerCallback = false;
+
+export function registerRemoteServerCallback(callServer: CallServer) {
+  if (hasRegisteredRemoteServerCallback) {
+    return;
+  }
+  setServerCallback(callServer as any);
+  hasRegisteredRemoteServerCallback = true;
+}