code: @Override
    public String extractClassNameIfProvide(Node node, Node parent) {
      String namespace = extractClassNameIfGoog(node, parent, "goog.provide");
      if (namespace == null) {
        namespace = extractClassNameIfGoog(node, parent, "goog.module");
      }
      return namespace;
    }
docs: Extracts X from goog.provide('X'), if the applied Node is goog.
  
  @return The extracted class name, or null.