fix(es/transforms): Handle member object in missing else branch (#7027)

**Related issue:**

 - Closes #7025.

Author: magic-akari

crates/swc_ecma_transforms_optimization/src/const_modules.rs

@@ -161,11 +161,11 @@ impl VisitMut for ConstModules {
                 }
             }
             Expr::Member(MemberExpr { obj, prop, .. }) if obj.is_ident() => {
-                let member_obj = obj.as_ident().unwrap();
-
-                if self.scope.namespace.contains(&member_obj.to_id()) {
-                    let module_name = &member_obj.sym;
-
+                if let Some(module_name) = obj
+                    .as_ident()
+                    .filter(|member_obj| self.scope.namespace.contains(&member_obj.to_id()))
+                    .map(|member_obj| &member_obj.sym)
+                {
                     let imported_name = match prop {
                         MemberProp::Ident(ref id) => &id.sym,
                         MemberProp::Computed(ref p) => match &*p.expr {
@@ -188,10 +188,12 @@ impl VisitMut for ConstModules {
                         });
 
                     *n = (**value).clone();
+                } else {
+                    n.visit_mut_children_with(self);
                 }
             }
-            e => {
-                e.visit_mut_children_with(self);
+            _ => {
+                n.visit_mut_children_with(self);
             }
         };
     }

crates/swc_ecma_transforms_optimization/tests/const_modules.rs

@@ -116,3 +116,21 @@ console.log(foo["bar"])
 console.log(true);
 "#
 );
+
+test!(
+    ::swc_ecma_parser::Syntax::default(),
+    |tester| tr(
+        tester,
+        &[("testModule", &[("testMap", "{ 'var': 'value' }")])]
+    ),
+    issue_7025,
+    r#"
+    import { testMap } from "testModule";
+    testMap['var'];
+"#,
+    r#"
+    ({
+        'var': 'value'
+    })['var'];
+    "#
+);