/**
 * The **Theme Preview Service** — applies a theme's variables to the grid live,
 * with no rebuild and no flicker, by setting inline `--pg-*` custom properties on
 * the grid container (which override the scoped mode stylesheet). Delegates to
 * {@link ThemeManager.applyTokenOverrides} / {@link ThemeManager.clearTokenOverrides},
 * which also mirror onto `document.documentElement` so portaled menus re-theme too.
 *
 * @packageDocumentation
 */
import type { ThemeManager } from '../../theme/theme-manager';
/** Applies/reverts live theme variable overrides on the grid container. */
export declare class ThemePreviewService {
    private readonly themeManager;
    private readonly container;
    constructor(themeManager: ThemeManager, container: HTMLElement);
    /** Set the given `--pg-*` variables inline on the container (instant preview). */
    apply(variables: Readonly<Record<string, string>>): void;
    /** Remove all live overrides, reverting to the active mode/variant. */
    clear(): void;
}
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