Description: Adapt to babel7
--- a/activestorage/.babelrc
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "presets": [
-    ["env", { "modules": false } ]
-  ],
-  "plugins": [
-    "external-helpers"
-  ]
-}
--- /dev/null
+++ b/activestorage/babel.config.json
@@ -0,0 +1,8 @@
+{
+  "presets": [
+    "@babel/preset-env"
+  ],
+  "plugins": [
+    "@babel/plugin-external-helpers"
+  ]
+}