import type { Options } from '../types';
export declare function hasFallbacks(options: Options): boolean;
/**
 * Generate fallback CSS for all font families that have opted in.
 */
export declare function generateAllFallbacks(options: Options, root: string): Promise<string>;
/**
 * Build a map of font family name → fallback name for all fonts
 * that have fallback configured. Used by the transform hook.
 */
export declare function collectFallbackNames(options: Options): Map<string, string>;
/**
 * Transform CSS to append fallback font names to font-family declarations.
 * Only modifies declarations that reference a font with fallback configured.
 */
export declare function transformFontFamilyDeclarations(code: string, id: string, fallbackNames: Map<string, string>, sourcemap?: boolean): {
    code: string;
    map?: any;
} | undefined;