export declare const supportsHostContext: boolean;
/**
 * Only call this when `supportsHostContext` is `false`. Toggles `className` on `el` to mirror
 * `:host-context(.cw-theme-dark)`, and keeps it in sync as theme classes are toggled anywhere in the
 * document — we don't know in advance which ancestor (if any) carries the theme class, or when.
 * Returns a cleanup function to call from `disconnectedCallback`.
 */
export declare function watchThemeDarkFallback(el: HTMLElement, className: string): () => void;