/**
 * Call at the beginning of a useEffect, check after all your promises finished before applying results to state.
 * You must keep the same name for each useEffect
 * const {getConcurrency} = useIsConcurrent();
 * useEffect(()=>{
 *      const c = getConcurrency('loading data');
 *      const result = await someSlowPromise();
 *      if( c.isCurrent() ) setData(result);
 * },[]);
 */
export declare function useIsConcurrent(): {
    isCurrent: (effectName: string, value: number) => boolean;
    /** effectName must be unique for each useEffect */
    getConcurrency: (effectName: string) => {
        value: number;
        isCurrent: () => boolean;
    };
};