Don't allow instance properties transformation on namespace

packages/babel-plugin-transform-runtime/src/index.js

@@ -113,7 +113,14 @@ export default declare((api, options, dirname) => {
     );
   }
 
+  function isNamespaced(path) {
+    const binding = path.scope.getBinding(path.node.name);
+    if (!binding) return false;
+    return binding.path.isImportNamespaceSpecifier();
+  }
+
   function maybeNeedsPolyfill(path, methods, name) {
+    if (isNamespaced(path.get("object"))) return false;
     if (!methods[name].types) return true;
 
     const typeAnnotation = path.get("object").getTypeAnnotation();

packages/babel-plugin-transform-runtime/test/fixtures/runtime-corejs3/modules-namespaced/input.mjs

@@ -0,0 +1,2 @@
+import * as bar from "bar";
+bar.map();

packages/babel-plugin-transform-runtime/test/fixtures/runtime-corejs3/modules-namespaced/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": [["transform-runtime", { "corejs": 3 }]]
+}

packages/babel-plugin-transform-runtime/test/fixtures/runtime-corejs3/modules-namespaced/output.mjs

@@ -0,0 +1,2 @@
+import * as bar from "bar";
+bar.map();