import * as React from 'react';
export declare const CompositeRootContext: React.Context<CompositeRootContext.Value | null>;
export declare function useCompositeRootContext(): CompositeRootContext.Value;
export declare namespace CompositeRootContext {
    interface Value {
        activeIndex: number;
        onActiveIndexChange: (index: number) => void;
    }
}