Revert "Commit updated Javascript packages"

This reverts commit a88734348a.

build/javascript/node_modules/@babel/runtime/helpers/classPrivateFieldGet.js

@@ -1,15 +0,0 @@
-function _classPrivateFieldGet(receiver, privateMap) {
-  var descriptor = privateMap.get(receiver);
-
-  if (!descriptor) {
-    throw new TypeError("attempted to get private field on non-instance");
-  }
-
-  if (descriptor.get) {
-    return descriptor.get.call(receiver);
-  }
-
-  return descriptor.value;
-}
-
-module.exports = _classPrivateFieldGet;