code: private static Node getConstantDeclValue(Node name) {
      Node parent = name.getParent();
      if (parent == null) {
        return null;
      }
      if (name.isName()) {
        if (parent.isConst()) {
          return name.getFirstChild();
        } else if (!parent.isVar()) {
          return null;
        }
        JSDocInfo jsdoc = NodeUtil.getBestJSDocInfo(name);
        return jsdoc != null && jsdoc.isConstant() ? name.getFirstChild() : null;
      } else if (name.isGetProp() && parent.isAssign()) {
        JSDocInfo jsdoc = NodeUtil.getBestJSDocInfo(name);
        return jsdoc != null && jsdoc.isConstant() ? name.getNext() : null;
      }
      return null;
    }
docs: Checks whether the NAME node is inside either a CONST or a @const VAR. Returns the RHS node if
  so, otherwise returns null.