import type { ConditionPredicate, Dictionary, PreConditionReturn, SelectorReturn } from '../types';
export declare function preCondition<TSource extends Dictionary<TSource>, TDestination extends Dictionary<TDestination>, TSelectorReturn = SelectorReturn<TDestination>>(predicate: ConditionPredicate<TSource>, defaultValue?: TSelectorReturn): PreConditionReturn<TSource, TDestination, TSelectorReturn>;