import type { VariableFontAxes } from "../lib/core/types.js";
/**
 * Find all font files in the CSS response and determine which files should be preloaded.
 * In Google Fonts responses, the @font-face's subset is above it in a comment.
 * Walk through the CSS from top to bottom, keeping track of the current subset.
 */
export declare function findFontFilesInCss(css: string, subsetsToPreload?: string[]): {
    googleFontFileUrl: string;
    preloadFontFile: boolean;
}[];
/**
 * Filter CSS to only include specified subsets
 */
export declare function filterCssBySubsets(css: string, subsets: string[]): string;
/**
 * Generate Google Fonts URL for fetching CSS
 */
export declare function getGoogleFontsUrl(fontFamily: string, axes: {
    wght?: string[];
    ital?: string[];
    variableAxes?: [string, string][];
}, display: string, baseUrl?: string, subsets?: string[]): string;
/**
 * Parse font axes from weights and styles using font metadata
 * This ensures we use the actual supported weight ranges for variable fonts
 */
export declare function getFontAxes(fontFamily: string, weights: string[], styles: string[], selectedVariableAxes?: string[], customVariableAxes?: VariableFontAxes): {
    wght?: string[];
    ital?: string[];
    variableAxes?: [string, string][];
};
/**
 * Sort font variant values for consistent ordering
 * Handles complex formats like "ital,wght" used in Google Fonts API
 *
 * Based on next-font's implementation for proper variant sorting
 */
export declare function sortFontsVariantValues(valA: string, valB: string): number;
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