Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/node_modules/@babel/runtime/helpers/extends.js

@@ -0,0 +1,10 @@
+function _extends() {
+  return (module.exports = _extends = Object.assign ? Object.assign.bind() : function (n) {
+    for (var e = 1; e < arguments.length; e++) {
+      var t = arguments[e];
+      for (var r in t) ({}).hasOwnProperty.call(t, r) && (n[r] = t[r]);
+    }
+    return n;
+  }, module.exports.__esModule = true, module.exports["default"] = module.exports), _extends.apply(null, arguments);
+}
+module.exports = _extends, module.exports.__esModule = true, module.exports["default"] = module.exports;