start moving more transformers to packages and finish import of plugins from babel-plugins

packages/babel-plugin-react-constant-elements/package.json

@@ -2,7 +2,7 @@
   "name": "babel-plugin-react-constant-elements",
   "version": "1.0.3",
   "description": "Treat React JSX elements as value types and hoist them to the highest scope",
-  "repository": "babel-plugins/babel-plugin-react-constant-elements",
+  "repository": "babel/babelbabel-plugin-react-constant-elements",
   "license": "MIT",
   "main": "lib/index.js",
   "keywords": [

packages/babel-plugin-react-constant-elements/src/index.js

@@ -1,4 +1,4 @@
-export default function ({ Plugin }) {
+export default function () {
   var immutabilityVisitor = {
     enter(node, parent, scope, state) {
       var stop = () => {
@@ -23,7 +23,7 @@ export default function ({ Plugin }) {
     }
   };
 
-  return new Plugin("react-constant-elements", {
+  return {
     metadata: {
       group: "builtin-basic"
     },
@@ -42,5 +42,5 @@ export default function ({ Plugin }) {
         }
       }
     }
-  });
+  };
 }