/**
 * watchProp: Specifically for component attributes/props.
 * Returns a marker string that the RedGin core parses as a "Directive on a Tag".
 */
/**
 * Type definition for the reactive expression.
 * 'this' is typed as the component instance.
 */
type WatchExpression<T = any> = (this: T) => any;
export declare const attr: (attrName: string, exp: WatchExpression) => string;
export {};