chore: add comments

Author: SyMind

crates/rspack_plugin_rsc/src/client_plugin.rs

@@ -188,9 +188,10 @@ fn collect_server_entry_css_files(
       continue;
     };
 
-    // Server-entry CSS blocks use the server entry resource as their request.
-    // Client component blocks use the client module request, so this lookup
-    // also filters out non-CSS blocks without walking dependencies again.
+    // Only server CSS blocks should populate `entryCssFiles` for loadCss().
+    // Client component blocks use the client module request here; their CSS is
+    // recorded on `clientManifest[*].cssFiles` when recording the client module.
+    // This lookup keeps those client component CSS files out of server entries.
     if entry_state
       .server_entries
       .get(server_entry)

crates/rspack_plugin_rsc/src/server_plugin.rs

@@ -580,6 +580,12 @@ impl RscServerPlugin {
           .extend(importers);
       }
       entry_state.root_css_imports.extend(root_css_imports);
+
+      // These grouped client entries are only used to shape client compiler
+      // async blocks. They intentionally do not seed `server_entries`: CSS
+      // imported by client components is collected from client chunks into
+      // `clientManifest[*].cssFiles`, while `server_entries` tracks server CSS
+      // imports and `import.meta.rspackRsc.loadCss()` data.
       entry_state.injected_client_entries = client_entries.clone();
       entry_state.ungrouped_client_entries = ungrouped_client_entries;
       entry_state.root_client_entries = root_client_entries;