fix: should always walk import then arguments (#11760)

Author: ahabhgk

crates/rspack_plugin_javascript/src/parser_plugin/import_parser_plugin.rs

@@ -433,11 +433,13 @@ impl JavascriptParserPlugin for ImportParserPlugin {
       }
     };
 
-    if let Some(ns_obj) = referenced_fulfilled_ns_obj
-      && let Some(import_then) = import_then
-    {
-      walk_import_then_fulfilled_callback(parser, node, &import_then.args[0].expr, ns_obj);
-      parser.walk_expr_or_spread(&import_then.args[1..]);
+    if let Some(import_then) = import_then {
+      if let Some(ns_obj) = referenced_fulfilled_ns_obj {
+        walk_import_then_fulfilled_callback(parser, node, &import_then.args[0].expr, ns_obj);
+        parser.walk_expr_or_spread(&import_then.args[1..]);
+      } else {
+        parser.walk_expr_or_spread(&import_then.args);
+      }
     }
 
     if let Some(import_references) = parser

tests/rspack-test/normalCases/chunks/statical-dynamic-import-then/index.js

@@ -82,3 +82,12 @@ it("should analyze arguments in call member chain", async () => {
 		})());
 	});
 });
+
+it("should analyze then arguments", async () => {
+	await import("../statical-dynamic-import/dir4/lib?3").then(() => {
+		return import("../statical-dynamic-import/dir4/a?3").then(m2 => {
+			expect(m2.a).toBe(1);
+			expect(m2.usedExports).toEqual(["a", "usedExports"]);
+		});
+	});
+})