Lf/message server graceful error

src/server/LocalDevServer.ts

@@ -78,7 +78,6 @@ export default class LocalDevServer {
         }
 
         config.addMiddleware(middleware);
-
         const routes: ContainerAppExtension[] = [
             projectMetadata(this.sessionNonce, this.project)
         ];

src/server/__tests__/LocalDevServer.test.ts

@@ -23,8 +23,8 @@ jest.mock('@webruntime/server', () => {
                 super(...args);
                 mockServerConstructor(...args);
             }
-            initialize() { }
-            start() { }
+            initialize() {}
+            start() {}
             shutdown() {
                 this.emit('shutdown');
             }

src/server/config/WebruntimeConfig.ts

@@ -15,6 +15,8 @@ import { Plugin } from 'rollup';
 import { ApexService, SchemaService } from '@communities-webruntime/services';
 import { ResourceUrlService } from '../services/ResourceUrlService';
 import { ApexContinuationService } from '../services/ApexContinuationService';
+import { LWCMessageService } from '../services/LWCMessageService';
+
 import alias from '@rollup/plugin-alias';
 
 export default class WebruntimeConfig implements Config {
@@ -76,7 +78,8 @@ export default class WebruntimeConfig implements Config {
             AppBootstrapService,
             ImportMapService,
             ResourceUrlService,
-            SchemaService
+            SchemaService,
+            LWCMessageService
         ];
 
         this.bundle = [

src/server/services/LWCMessageService.ts

@@ -0,0 +1,41 @@
+import { CompileService } from '@webruntime/api';
+import path from 'path';
+
+const APEX_LWC_MESSAGE_SERVICE_REGEX = /^(@salesforce\/messageChannel\/.*)/;
+
+function matchesLWCMessageServiceScopedModule(id: string) {
+    return id && id.match(APEX_LWC_MESSAGE_SERVICE_REGEX);
+}
+
+/**
+ * Rollup plugin to resolve @salesforce/apexContinuation
+ *
+ */
+function plugin() {
+    return {
+        name: 'rollup-plugin-lwc-message-service',
+
+        resolveId(id: string) {
+            return matchesLWCMessageServiceScopedModule(id) ? id : null;
+        },
+        load(id: any) {
+            const idParts = matchesLWCMessageServiceScopedModule(id);
+            if (idParts) {
+                throw new Error(
+                    "You can't preview a component using Lightning Messages Service. Test the component directly in the org"
+                );
+            }
+            return null;
+        }
+    };
+}
+
+export class LWCMessageService implements CompileService {
+    getPlugin() {
+        return plugin();
+    }
+
+    async initialize() {}
+
+    shutdown() {}
+}