fix: sort ConcatenatedModule export keys for deterministic builds (#13425)

Sort exports_map entries by key before rendering the
__webpack_require__.d(exports, {...}) object in ConcatenatedModule.
HashMap iteration order is non-deterministic, causing identical source
to produce different content hashes across builds.

This matches the approach already used in ESMExportInitFragment
(init_fragment.rs:356) where export_map is sorted before rendering.

Closes #13182

Co-authored-by: easonysliu <easonysliu@tencent.com>
Co-authored-by: Claude (claude-opus-4-6) <noreply@anthropic.com>

Author: 3 people

crates/rspack_core/src/concatenated_module.rs

@@ -1621,14 +1621,21 @@ impl Module for ConcatenatedModule {
 
     // Define exports
     if !exports_map.is_empty() {
-      let mut definitions = Vec::new();
-      for (key, value) in exports_map.iter() {
-        definitions.push(format!(
-          "\n  {}: {}",
-          property_name(key).expect("should convert to property_name"),
-          runtime_template.returning_function(value, "")
-        ));
-      }
+      let mut definitions: Vec<_> = exports_map
+        .iter()
+        .map(|(key, value)| {
+          (
+            key.clone(),
+            format!(
+              "\n  {}: {}",
+              property_name(key).expect("should convert to property_name"),
+              runtime_template.returning_function(value, "")
+            ),
+          )
+        })
+        .collect();
+      definitions.sort_by(|a, b| a.0.cmp(&b.0));
+      let definitions: Vec<_> = definitions.into_iter().map(|(_, s)| s).collect();
 
       let exports_argument = self.get_exports_argument();