import { App, ComputedRef, MaybeRef } from 'vue';
export declare const PROVIDED_Z_INDEX = "___vxp-provided-z-index";
export declare const globalZIndex: ComputedRef<number>;
/**
 * Provide a z-index config for under components.
 *
 * @param sourceZIndex z-index config
 * @param app the app of Vue, will use app.provide if specify
 */
export declare function configZIndex(sourceZIndex: MaybeRef<number>, app?: App): void;
export declare function useZIndex(): () => number;