/**
 * Watermark Guard — MutationObserver that re-injects the watermark
 * if it's removed from the shadow DOM.
 *
 * Protection strategies:
 * 1. MutationObserver watches for childList changes
 * 2. Re-injects watermark with random delay (100-500ms)
 * 3. Creates a backup watermark with a different class name
 * 4. CSS uses !important to resist style overrides
 */
/**
 * Initialize the watermark guard on a shadow root.
 * Watches for removal of .vz-watermark and re-injects it.
 */
export declare function initWatermarkGuard(shadowRoot: ShadowRoot | HTMLElement, linkUrl?: string, logoUrl?: string): void;
/**
 * Tear down the guard for one root (player disposal / tests).
 * Calling with no argument is a no-op.
 */
export declare function destroyWatermarkGuard(shadowRoot?: ShadowRoot | HTMLElement): void;
/**
 * Check if the watermark guard is currently active for a root.
 */
export declare function isWatermarkGuardActive(shadowRoot: ShadowRoot | HTMLElement): boolean;
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