WIP - add extractor, generate snippet_data

node_modules/@babel/runtime/helpers/esm/classPrivateFieldLooseBase.js

@@ -0,0 +1,7 @@
+export default function _classPrivateFieldBase(receiver, privateKey) {
+  if (!Object.prototype.hasOwnProperty.call(receiver, privateKey)) {
+    throw new TypeError("attempted to use private field on non-instance");
+  }
+
+  return receiver;
+}