/**
 * Environment-based configuration system
 *
 * This allows users to configure the player via environment variables
 * for easy customization without code changes.
 */
import type { LyricTheme, LyricDisplayOptions } from '../../types/components';
/**
 * Environment variable configuration interface
 */
export interface EnvLyricConfig {
    displayMode?: string;
    highlightMode?: string;
    themeName?: string;
    colorInactive?: string;
    colorActive?: string;
    colorCurrent?: string;
    colorPrev?: string;
    colorNext?: string;
    colorBackground?: string;
    fontFamily?: string;
    fontSizeCurrent?: string;
    fontSizePrev?: string;
    fontSizeNext?: string;
    fontWeightCurrent?: string;
    fontWeightPrev?: string;
    fontWeightNext?: string;
    lineHeight?: string;
    wordSpacing?: string;
    letterSpacing?: string;
    padding?: string;
    transitionDuration?: string;
    highlightDuration?: string;
    scrollDuration?: string;
    autoScroll?: string;
    smoothScroll?: string;
}
/**
 * SoundFont auto-load configuration interface
 */
export interface EnvSoundFontConfig {
    autoLoad?: string;
    defaultPath?: string;
    autoLoadTimeout?: string;
}
/**
 * Google Fonts configuration interface
 */
export interface EnvGoogleFontConfig {
    defaultFont?: string;
    autoLoad?: string;
}
/**
 * Load lyric configuration from environment variables
 */
export declare function loadEnvConfig(): EnvLyricConfig;
/**
 * Convert env config to LyricDisplayOptions
 */
export declare function envConfigToDisplayOptions(envConfig: EnvLyricConfig): Partial<LyricDisplayOptions>;
/**
 * Convert env config to LyricTheme
 */
export declare function envConfigToTheme(envConfig: EnvLyricConfig, baseName?: string): LyricTheme;
/**
 * Create theme from environment variables
 */
export declare function createThemeFromEnv(name?: string): LyricTheme;
/**
 * Load display options from environment
 */
export declare function loadDisplayOptionsFromEnv(): Partial<LyricDisplayOptions>;
/**
 * Load soundfont configuration from environment variables
 */
export declare function loadSoundFontConfig(): EnvSoundFontConfig;
/**
 * Check if auto-load soundfont is enabled
 */
export declare function isSoundFontAutoLoadEnabled(): boolean;
/**
 * Get default soundfont path from env or return default
 */
export declare function getDefaultSoundFontPath(): string | null;
/**
 * Get soundfont auto-load timeout (in ms)
 */
export declare function getSoundFontAutoLoadTimeout(): number;
/**
 * Load Google Fonts configuration from environment variables
 */
export declare function loadGoogleFontConfig(): EnvGoogleFontConfig;
/**
 * Get default font from env
 */
export declare function getDefaultFont(): string | null;
/**
 * Check if font auto-load is enabled
 */
export declare function isFontAutoLoadEnabled(): boolean;
/**
 * Helper to merge env config with user config
 */
export declare function mergeWithEnvConfig<T extends Record<string, any>>(userConfig: T, envConfig?: Partial<T>): T;