[remix] Don't create output for Pathless Layout Routes without any child routes at the root level (#9539)

Fixes https://github.com/vercel/community/discussions/1587.

packages/remix/src/build.ts

@@ -237,6 +237,12 @@ module.exports = config;`;
 
     const path = getPathFromRoute(route, remixConfig.routes);
 
+    // If the route is a pathless layout route (at the root level)
+    // and doesn't have any sub-routes, then a function should not be created.
+    if (!path) {
+      continue;
+    }
+
     let isEdge = false;
     for (const currentRoute of getRouteIterator(route, remixConfig.routes)) {
       const staticConfig = staticConfigsMap.get(currentRoute);

packages/remix/src/utils.ts

@@ -41,9 +41,12 @@ export function getPathFromRoute(
   route: ConfigRoute,
   routes: RouteManifest
 ): string {
+  if (route.id === 'root' || (route.parentId === 'root' && route.index)) {
+    return 'index';
+  }
+
   const pathParts: string[] = [];
   for (const currentRoute of getRouteIterator(route, routes)) {
-    if (currentRoute.index) pathParts.push('index');
     if (currentRoute.path) pathParts.push(currentRoute.path);
   }
   const path = pathParts.reverse().join('/');