/**
 * Filename generation utilities for screenshots
 */
/**
 * Slugify a caption for use in filenames.
 * Lowercase, replace non-alphanumeric with dashes, collapse runs, trim, truncate to 25 chars.
 */
export declare function slugifyCaption(caption: string): string;
/**
 * Generate UTC timestamp filename
 * Format: screenshot-YYYY-MM-DD-HH-MM-SS-Z.jpg
 * With caption: screenshot-YYYY-MM-DD-HH-MM-SS-Z-slug.jpg
 */
export declare function generateScreenshotFilename(date?: Date, caption?: string): string;
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