Issue #3269673: Warning after clearing caches

src/Component/ComponentDiscovery.php

@@ -323,8 +323,13 @@ class ComponentDiscovery {
   private function discoverDistAssets(string $path): array {
     $extensions = ['css', 'js'];
     $app_root = \Drupal::getContainer()->getParameter('app.root');
-    $dirname = substr(dirname(__DIR__), strlen($app_root) + 1);
+    $dirname = substr(dirname(__DIR__, 2), strlen($app_root) + 1);
     $num = count(explode(DIRECTORY_SEPARATOR, $dirname));
+    // CL Components is the module owning the library definition. However, the
+    // actual files live wherever the component is. We need to calculate the
+    // relative route to the files starting from CL Component, since drupal
+    // assumes paths for files in libraries are relative to the module owning
+    // the library.
     $dots = implode(DIRECTORY_SEPARATOR, array_fill(0, $num, '..'));
     return array_reduce($extensions, function (array $carry, string $extension) use ($dots, $path) {
       $full_path = sprintf('%s/%s', $path, $extension);