interface SubInstance {
    show: () => void;
    hide: () => void;
}
interface SubContext {
    addSub: (sub: SubInstance) => void;
    removeSub: (sub: SubInstance) => void;
    showSub: (sub: SubInstance) => void;
    hideSub: (sub: SubInstance) => void;
}
export declare const subContextSymbol: unique symbol;
export declare function useSubProvide(): void;
export declare function useSubInject(): SubContext;
export {};