/**
 * Recursively collects text content from a DOM subtree, descending into nested
 * shadow roots. Standard `Node.textContent` does not pierce shadow DOM boundaries,
 * which means resolved text inside child custom-elements (such as `<ufm-content-name>`
 * whose async result lives in its own shadow root) is invisible to it. This helper
 * walks the tree and reads through.
 * @param {ShadowRoot | Element | null | undefined} root - the element or shadow root to traverse. If an `Element` with a shadow root is provided, the shadow root is traversed in preference to the light DOM children.
 * @returns {string} the concatenated text content of every descendant text node, skipping empty fragments.
 */
export declare function getTextFromDescendants(root: ShadowRoot | Element | null | undefined): string;