diff --git a/lib/core/src/server/serverRequire.js b/lib/core/src/server/serverRequire.js
index 9deb4cba90e9..aab3dc8a4d5d 100644
--- a/lib/core/src/server/serverRequire.js
+++ b/lib/core/src/server/serverRequire.js
@@ -78,13 +78,10 @@ export default function serverRequire(filePath) {
 
   const { path: candidatePath, ext: candidateExt } = existingCandidate;
 
-  if (candidateExt === '.js') {
-    return interopRequireDefault(candidatePath);
-  }
-
   const moduleDescriptor = interpret.extensions[candidateExt];
 
-  if (moduleDescriptor !== null && registerCompiler(moduleDescriptor) === 0) {
+  // The "moduleDescriptor" either "undefined" or "null". The warning isn't needed in these cases.
+  if (moduleDescriptor && registerCompiler(moduleDescriptor) === 0) {
     logger.warn(`=> File ${candidatePath} is detected`);
     logger.warn(`   but impossible to import loader for ${candidateExt}`);