Return a unique identifier node for each use.

packages/babel-core/src/transformation/file/index.js

@@ -220,7 +220,7 @@ export default class File extends Store {
       prependDeclaration(specifiers);
     }
 
-    return id;
+    return t.identifier(id.name);
   }
 
   addHelper(name: string): Object {

packages/babel-core/src/transformation/store.js

@@ -1,11 +1,6 @@
 export default class Store {
   constructor() {
     this._map = new Map();
-    this._map.dynamicData = {};
-  }
-
-  setDynamic(key, fn) {
-    this._map.dynamicData[key] = fn;
   }
 
   set(key: string, val) {
@@ -15,12 +10,6 @@ export default class Store {
   get(key: string): any {
     if (this._map.has(key)) {
       return this._map.get(key);
-    } else {
-      if (Object.prototype.hasOwnProperty.call(this._map.dynamicData, key)) {
-        const val = this._map.dynamicData[key]();
-        this._map.set(key, val);
-        return val;
-      }
     }
   }
 }

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

@@ -39,24 +39,23 @@ export default function({ types: t }) {
         );
       }
 
-      this.setDynamic("regeneratorIdentifier", function() {
-        return file.addImport(
-          `${moduleName}/regenerator`,
-          "default",
-          "regeneratorRuntime",
-        );
-      });
+      this.moduleName = moduleName;
     },
 
     visitor: {
       ReferencedIdentifier(path, state) {
         const { node, parent, scope } = path;
-
         if (
           node.name === "regeneratorRuntime" &&
           state.opts.regenerator !== false
         ) {
-          path.replaceWith(state.get("regeneratorIdentifier"));
+          path.replaceWith(
+            this.file.addImport(
+              `${this.moduleName}/regenerator`,
+              "default",
+              "regeneratorRuntime",
+            ),
+          );
           return;
         }