/**
 * Counts elements carrying the `data-blossom-slide` attribute in an HTML
 * string (the server-rendered output of a carousel's children snippet).
 *
 * A small tag-aware scanner rather than a bare regex, so that:
 * - text content that happens to contain the literal attribute name is not
 *   counted,
 * - a `>` inside a quoted attribute value does not truncate the tag,
 * - comments are skipped.
 */
export declare function countSlideMarkers(html: string): number;