/**
 * Cover image format detection and built-in cover catalog
 * Resolves shorthand names (e.g., "gradient_8", "solid_blue") to full Notion cover URLs
 */
/**
 * Format a cover value into the Notion API cover object.
 * Accepts:
 * - Full URL (http/https) -> external cover
 * - Shorthand name (e.g., "gradient_8", "solid_blue") -> resolved to Notion CDN URL
 */
export declare function formatCover(value: string): {
    type: 'external';
    external: {
        url: string;
    };
};
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