code: private Node createCompilerDefaultValueOverridesVarNode(
        Node sourceInformationNode) {
      Node objNode = IR.objectlit().srcref(sourceInformationNode);
      for (Entry<String, Node> entry : compilerDefaultValueOverrides.entrySet()) {
        Node objKeyNode = IR.stringKey(entry.getKey())
            .useSourceInfoIfMissingFrom(sourceInformationNode);
        Node objValueNode = entry.getValue().cloneNode()
            .useSourceInfoIfMissingFrom(sourceInformationNode);
        objKeyNode.addChildToBack(objValueNode);
        objNode.addChildToBack(objKeyNode);
      }
      return objNode;
    }
docs: Creates a JS object that holds a map of tweakId -> default value override.