/**
 * True while a reveal renders its new theme. ThemeProvider skips its colour fade then: the new
 * page is live inside the blob, so the fade played there too and the blob opened grey.
 */
export declare function isRevealingTheme(): boolean;
/**
 * Applies `change` inside a view transition that clips the new page in as a blob growing out of
 * `origin`. Without view transitions, or when the user asks for reduced motion, the change just
 * happens.
 */
export declare function revealTheme(change: () => void, origin: Element): void;