/**
 * Google Fonts Integration for Thai Karaoke
 *
 * Provides easy selection of popular Thai fonts from Google Fonts
 */
/**
 * Available Thai fonts from Google Fonts
 */
export type ThaiGoogleFont = 'Kanit' | 'Prompt' | 'Anuphan' | 'Chakra Petch' | 'Sarabun';
/**
 * Font configurations with Google Fonts URLs
 */
export declare const THAI_FONTS: Record<ThaiGoogleFont, {
    name: string;
    family: string;
    googleFontsUrl: string;
    weights: number[];
    fallback: string;
}>;
/**
 * Get font configuration
 */
export declare function getFontConfig(fontName: ThaiGoogleFont): {
    name: string;
    family: string;
    googleFontsUrl: string;
    weights: number[];
    fallback: string;
};
/**
 * Get font family CSS string
 */
export declare function getFontFamily(fontName: ThaiGoogleFont): string;
/**
 * Load Google Font dynamically
 * Injects <link> tag into document head and applies to lyrics
 */
export declare function loadGoogleFont(fontName: ThaiGoogleFont): void;
/**
 * Apply font to all lyric containers
 */
export declare function applyFontToLyrics(fontName: ThaiGoogleFont): void;
/**
 * Check if a font name is valid Thai Google Font
 */
export declare function isValidThaiFont(fontName: string): fontName is ThaiGoogleFont;
/**
 * Get all available Thai fonts
 */
export declare function getAvailableThaifonts(): ThaiGoogleFont[];
/**
 * Auto-load font from environment config
 */
export declare function autoLoadFontFromEnv(): void;