code: public static Matcher constructorPropertyDeclaration() {
      return new Matcher() {
        @Override public boolean matches(Node node, NodeMetadata metadata) {
          // This will match against code that looks like:
          // /** @constructor */
          // function constructor() {
          //   this.variable = 3;
          // }
          if (!node.isAssign()
              || !node.getFirstChild().isGetProp()
              || !node.getFirstFirstChild().isThis()) {
            return false;
          }
          while (node != null && !node.isFunction()) {
            node = node.getParent();
          }
          if (node != null && node.isFunction()) {
            JSDocInfo jsDoc = NodeUtil.getBestJSDocInfo(node);
            if (jsDoc != null) {
              return jsDoc.isConstructor();
            }
          }
          return false;
        }
      };
    }
docs: Returns a Matcher that matches against properties that are declared in the constructor.