Revert "Commit updated Javascript packages"

This reverts commit a88734348a.

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

@@ -1,9 +0,0 @@
-function _assertThisInitialized(self) {
-  if (self === void 0) {
-    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
-  }
-
-  return self;
-}
-
-module.exports = _assertThisInitialized;