Allow plugins to assert that a specific babel version has loaded the plugin. (#7450)

packages/babel-plugin-transform-react-inline-elements/src/index.js

@@ -1,7 +1,10 @@
+import { declare } from "@babel/helper-plugin-utils";
 import helper from "@babel/helper-builder-react-jsx";
 import { types as t } from "@babel/core";
 
-export default function() {
+export default declare(api => {
+  api.assertVersion(7);
+
   function hasRefOrSpread(attrs) {
     for (let i = 0; i < attrs.length; i++) {
       const attr = attrs[i];
@@ -62,4 +65,4 @@ export default function() {
     },
   });
   return { visitor };
-}
+});