Make Packager send fresh modules through HMR interface

Reviewed By: frantic

Differential Revision: D2787951

fb-gh-sync-id: 63c04710b60d99b5161ef9a40b116ba2f72df745

local-cli/server/util/attachHMRServer.js

@@ -19,7 +19,12 @@ function attachHMRServer({httpServer, path, packagerServer}) {
       return;
     }
 
-    // TODO(martinb): send HMR update
+    packagerServer.buildBundleForHMR({
+      entryFile: filename,
+      // TODO(martinb): receive platform on query string when client connects
+      platform: 'ios',
+    })
+    .then(bundle => activeWS.send(bundle));
   });
 
   const WebSocketServer = require('ws').Server;