Fix generators

Fixes codesandbox#1169

Author: CompuIves

packages/app/src/sandbox/eval/loaders/dependency-resolver.js

@@ -1,5 +1,17 @@
 import DependencyNotFoundError from 'sandbox-hooks/errors/dependency-not-found-error';
 
+/**
+ * We don't have fancy resolving for @babel/runtime because of optimalization,
+ * so we try to alter it the best way we can.
+ */
+function alterBabelRuntimeDependencyPath(path: string) {
+  if (path === '@babel/runtime/regenerator') {
+    return '@babel/runtime/regenerator/index';
+  }
+
+  return path;
+}
+
 /**
  * Converts a dependency string to an actual dependency
  *
@@ -10,7 +22,9 @@ import DependencyNotFoundError from 'sandbox-hooks/errors/dependency-not-found-e
 export default function getDependency(dependencyPath: string) {
   if (dependencyPath.startsWith('@babel/runtime/')) {
     // We have a precomputed bundle for this, since it's small anyway
-    return require('./@babel-runtime.no-webpack')(dependencyPath);
+    return require('./@babel-runtime.no-webpack')(
+      alterBabelRuntimeDependencyPath(dependencyPath)
+    );
   }
 
   if (dependencyPath === 'codesandbox-api') {