added basic support for module attributes and tests updated (#10962)

Co-Authored-By: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

packages/babel-plugin-syntax-module-attributes/src/index.js

@@ -0,0 +1,21 @@
+import { declare } from "@babel/helper-plugin-utils";
+
+export default declare((api, { version }) => {
+  api.assertVersion(7);
+
+  if (typeof version !== "string" || version !== "apr-2020") {
+    throw new Error(
+      "The 'moduleAttributes' plugin requires a 'version' option," +
+        " representing the last proposal update. Currently, the" +
+        " only supported value is 'apr-2020'.",
+    );
+  }
+
+  return {
+    name: "syntax-module-attributes",
+
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push(["moduleAttributes", { version }]);
+    },
+  };
+});