/**
 * Shared background-lock utility for overlay components (dialog, drawer, etc.).
 *
 * Uses a reference count so that multiple stacked overlays each call
 * lock / unlock independently without interfering with each other. The `inert`
 * attribute is applied once when the first overlay opens and removed once the
 * last one closes.
 *
 * The factory pattern (`createBackgroundLock`) provides test-isolated instances.
 * The module-level `lockBackground` / `unlockBackground` are the defaults used
 * by all runtime components.
 */
export type BackgroundLock = {
    lock(host: Element): void;
    unlock(): void;
};
export declare function createBackgroundLock(): BackgroundLock;
/** Marks sibling elements as inert. Safe to call from multiple concurrent overlays. */
export declare const lockBackground: (host: Element) => void;
/** Releases the background lock. Removes inert when all overlays have closed. */
export declare const unlockBackground: () => void;
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