/**
 * Generate a filesystem-safe slug from a screen title.
 *
 * - Lowercases and strips non-alphanumeric characters.
 * - Falls back to screenId when title is empty/undefined.
 * - Appends a numeric suffix on collision within the same `seen` set.
 *
 * @param title - Screen title (may be undefined).
 * @param screenId - Fallback identifier.
 * @param seen - Mutable set tracking slugs already used in this batch.
 * @returns A unique, filesystem-safe slug.
 */
export declare function slugify(title: string | undefined, screenId: string, seen: Set<string>): string;
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