/**
 * Shared hero attribute keys. Lives in its own module so both the dispatcher
 * (transition.ts) and the chrome providers can consume them without creating
 * an import cycle through provider/index.ts.
 */
export declare const HERO_ENTER_KEY = "data-hero-enter-key";
export declare const HERO_EXIT_KEY = "data-hero-exit-key";
export declare const HERO_LEGACY_KEY = "data-hero-key";
/** CSS selector matching any hero-keyed element. */
export declare const HERO_ANY_KEY_SELECTOR = "[data-hero-enter-key],[data-hero-exit-key],[data-hero-key]";
/** True if `el` itself carries any hero key. */
export declare function isHeroKeyed(el: HTMLElement): boolean;
/** True if `el` is hero-keyed or contains any hero-keyed descendant. */
export declare function isOrContainsHeroKey(el: HTMLElement): boolean;
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