import { ExtractedMetadata, PreviewOptions, TemplateConfig } from '../types';
/**
 * Default overlay generator for templates that don't provide a custom overlayGenerator.
 * Uses conservative typography + wrapping so custom templates still render cleanly.
 */
export declare function generateDefaultOverlay(metadata: ExtractedMetadata, template: TemplateConfig, width: number, height: number, options: PreviewOptions): Promise<Buffer>;