Fix lazy mode with React Server Components

Author: devongovett

packages/reporters/dev-server/src/NodeRunner.js

@@ -51,7 +51,9 @@ export class NodeRunner {
   startWorker(): Promise<void> {
     let entry = nullthrows(this.bundleGraph)
       .getEntryBundles()
-      .find(b => b.env.isNode() && b.type === 'js');
+      .find(
+        b => b.env.isNode() && /^\.(js|mjs|cjs)/.test(path.extname(b.filePath)),
+      );
     if (entry) {
       let relativePath = path.relative(process.cwd(), entry.filePath);
       this.logger.log({message: md`Starting __${relativePath}__...`});

packages/reporters/dev-server/src/ServerReporter.js

@@ -1,5 +1,6 @@
 // @flow
 
+import path from 'path';
 import {Reporter} from '@parcel/plugin';
 import HMRServer from './HMRServer';
 import Server from './Server';
@@ -69,7 +70,9 @@ export default (new Reporter({
             logger,
             event.bundleGraph
               .getEntryBundles()
-              .some(b => b.env.isBrowser() || b.type === 'html'),
+              .some(
+                b => b.env.isBrowser() || path.extname(b.filePath) === 'html',
+              ),
           );
         }