import { ComputedRef } from 'vue';
interface UseLayer {
    /**
     * The z-index of the layer.
     */
    layerIndex: ComputedRef<number>;
    /**
     * The number of the layer in the global stack. Bottom layer is 0, additional layers increment upward
     */
    layerPostition: ComputedRef<number>;
    /**
     * Opens the layer, claiming a z-index from the global stack.
     */
    openLayer: () => void;
    /**
     * Closes the layer, releasing its z-index back to the global stack.
     */
    closeLayer: () => void;
}
export declare function isTopLayer(z: number): boolean;
/**
 * Provides a reactive z-index that participates in the global layer stack.
 * Each floating element (Modal, Sheet, Popout, Tooltip, …) should call this
 * composable and invoke `open()` when it becomes visible and `close()` when
 * it hides.  The layer is automatically released when the component unmounts.
 */
export declare function useLayer(): UseLayer;
export {};