import { OnDestroy, RendererFactory2 } from '@angular/core';
import * as i0 from "@angular/core";
export type AppearanceType = 'light' | 'dark';
export declare class ThemeService implements OnDestroy {
    appearance: import("@angular/core").WritableSignal<AppearanceType>;
    private themeChangeListener;
    private mediaQueryList;
    private handleThemeChange;
    private useSystemTheme;
    private currentTheme;
    private renderer;
    private telegramService;
    private document;
    constructor(rendererFactory: RendererFactory2);
    ngOnDestroy(): void;
    /**
     * Change the theme manually
     * @param theme The theme to set
     * @param followSystem If true, will follow system theme changes after setting. Default false.
     */
    setTheme(theme: AppearanceType, followSystem?: boolean): void;
    /**
     * Setup theme based on inputs and system preferences
     * @param appearance Appearance to use
     * @param followSystem Whether to follow system theme
     */
    setupTheme(appearance?: AppearanceType, followSystem?: boolean): void;
    /**
     * Detect and apply system theme
     */
    detectSystemTheme(): void;
    /**
     * Load global CSS variables to make them available for all components
     */
    loadGlobalStyles(): void;
    /**
     * Initialize the theme detection
     */
    private initializeTheme;
    /**
     * Setup browser theme detection using prefers-color-scheme
     */
    private setupBrowserThemeDetection;
    /**
     * Apply theme class to DOM
     */
    private applyThemeToDOM;
    /**
     * Clean up event listeners
     */
    private cleanupListeners;
    static ɵfac: i0.ɵɵFactoryDeclaration<ThemeService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ThemeService>;
}