code: static boolean isAliasedConstDefinition(Node lhs) {
      JSDocInfo jsdoc = getBestJSDocInfo(lhs);
      if (jsdoc == null && !lhs.isFromExterns()) {
        return false;
      }
      if (jsdoc != null && !jsdoc.hasConstAnnotation()) {
        return false;
      }
      Node rhs = getRValueOfLValue(lhs);
      if (rhs == null || !rhs.isQualifiedName()) {
        return false;
      }
      Node parent = lhs.getParent();
      return (lhs.isName() && parent.isVar())
          || (lhs.isGetProp() && lhs.isQualifiedName()
              && parent.isAssign() && parent.getParent().isExprResult());
    }
docs: True for aliases defined with @const, not for aliases defined with @constructor/@interface.