/**
 * @license
 * Copyright 2023 Nuraly, Laabidi Aymen
 * SPDX-License-Identifier: MIT
 */
import { ReactiveController, ReactiveControllerHost } from 'lit';
import { ThemeVariant } from '../themes.js';
/**
 * Theme controller that observes and reacts to theme changes on the host element or its parents
 * This controller watches for data-theme attribute changes and triggers re-renders
 */
export declare class ThemeController implements ReactiveController {
    private host;
    private observer?;
    private _currentTheme;
    constructor(host: ReactiveControllerHost & HTMLElement);
    /**
     * Get the current theme variant
     */
    get currentTheme(): ThemeVariant | null;
    /**
     * Check if the current theme is a dark variant
     */
    get isDark(): boolean;
    /**
     * Check if the current theme is a light variant
     */
    get isLight(): boolean;
    /**
     * Get the theme system (default, carbon)
     */
    get themeSystem(): string;
    hostConnected(): void;
    hostDisconnected(): void;
    private updateTheme;
    private setupObserver;
    private cleanup;
    /**
     * Apply a theme to the closest themed ancestor or the host element
     * @param theme - The theme variant to apply
     */
    applyTheme(theme: ThemeVariant): void;
    /**
     * Toggle between light and dark variants of the current theme
     */
    toggleVariant(): void;
}
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