import type { FontSubsetting } from "../core/types.js";
/**
 * Build Google Fonts URL with subsetting parameters
 */
export declare function buildGoogleFontsUrlWithSubset(baseUrl: string, fontFamily: string, params: Record<string, string>, subset?: FontSubsetting): string;
/**
 * Subset Google Font by adding text parameter to URL
 * This reduces font file size by only including specified characters
 */
export declare function subsetGoogleFont(fontFamily: string, cssUrl: string, subset?: FontSubsetting): string;
/**
 * Extract characters from text for subsetting
 */
export declare function extractUniqueCharacters(text: string): string;
/**
 * Generate common character sets for subsetting
 */
export declare const COMMON_CHARACTER_SETS: {
    /**
     * Basic Latin characters (A-Z, a-z, 0-9, basic punctuation)
     */
    readonly basicLatin: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 .,!?;:";
    /**
     * Extended Latin with accents
     */
    readonly latinExtended: "ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ";
    /**
     * Numbers and common symbols
     */
    readonly numbers: "0123456789+-=()[]{}.,!?;:'\"@#$%^&*";
    /**
     * Common punctuation
     */
    readonly punctuation: ".,!?;:'\"()[]{}/\\-_=+*&^%$#@~`|<>";
};
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