recognize a src/index.js file as a main module for a package

javascript/ql/src/semmle/javascript/NodeModuleResolutionImpl.qll

@@ -96,8 +96,11 @@ File resolveMainModule(PackageJSON pkg, int priority) {
     )
   )
   or
-  result =
-    tryExtensions(pkg.getFile().getParentContainer(), "index", priority - prioritiesPerCandidate())
+  exists(Folder folder | folder = pkg.getFile().getParentContainer() |
+    result =
+      tryExtensions([folder, folder.getChildContainer("src")], "index",
+        priority - prioritiesPerCandidate())
+  )
 }
 
 /**