/**
 * Core shadow DOM traversal logic that can be reused across different testing frameworks.
 * Note: Requires browser support for Shadow DOM APIs (customElements, shadowRoot, etc.).
 */
/**
 * Walks a root node (Document or ShadowRoot) depth-first to find elements.
 * @param {Document | ShadowRoot} root - The root node to start searching from
 * @param {string} selector - CSS selector to search for
 * @returns {Element | null} - The found element, or null
 */
export declare function walkShadowDom(root: Document | ShadowRoot, selector: string): Element | null;
/**
 * Helper function to create a data-testid selector
 * @param {string} testId - The data-testid value
 * @returns {string} - CSS selector for the data-testid
 */
export declare function createDataTestIdSelector(testId: string): string;