Updated the files.

my-app/node_modules/@babel/runtime/helpers/esm/classApplyDescriptorSet.js

@@ -0,0 +1,10 @@
+export default function _classApplyDescriptorSet(receiver, descriptor, value) {
+  if (descriptor.set) {
+    descriptor.set.call(receiver, value);
+  } else {
+    if (!descriptor.writable) {
+      throw new TypeError("attempted to set read only private field");
+    }
+    descriptor.value = value;
+  }
+}