refactor: code

Author: snitin315

lib/Server.js

@@ -1954,7 +1954,7 @@ class Server {
           // If key = main.other.mjs && filename = main.other => true
           if (
             splitKey.length - 1 === splitOutputFilename.length &&
-            splitKey[0] === outputFilename.split(".")[0]
+            splitKey[0] === splitOutputFilename[0]
           ) {
             extension = path.extname(key);
             isOutputModule = value.javascriptModule;