/**
 * Extracts all text nodes from a React element tree.
 *
 * @param obj - React node or primitive value to extract text from.
 * @returns A string containing all text from the node tree.
 *
 * @example
 * ```tsx
 * const element = <div>Hello <span>World</span></div>;
 * const text = extractNodeString(element);
 * console.log(text); // "Hello World"
 * ```
 */
export declare const extractNodeString: (obj: any) => string;