import { KVGroupTransform } from '../types/base';
import { ItemType } from '../types';
import { Mapper } from 'augmentative-iterable';
/**
 * Return a transformation function for use in group operation to guarantee distinct elements for each group, following the informed grouping mapper
 * @param valueDistinctMapper must return the unicity key. The unicity is respected by group
 */
export declare function getGroupingDistinct<K, T>(valueDistinctMapper: keyof T): KVGroupTransform<K, T>;
/**
 * Return a transformation function for use in group operation to guarantee distinct elements for each group, following the informed grouping mapper
 * @param valueMapper maps the value for a Iterable of values. Useful if you need to flat map your values per group somehow
 * @param valueDistinctMapper must return the unicity key. The unicity is respected by group
 */
export declare function getGroupingDistinct<K, T, KT extends keyof T, NewT extends ItemType<T[KT]> = ItemType<T[KT]>>(valueMapper: KT, valueDistinctMapper: keyof ItemType<T[KT]>): KVGroupTransform<K, T, NewT>;
/**
 * Return a transformation function for use in group operation to guarantee distinct elements for each group, following the informed grouping mapper
 * @param valueDistinctMapper must return the unicity key. The unicity is respected by group
 */
export declare function getGroupingDistinct<K, T, NewT>(valueDistinctMapper: Mapper<T, NewT>): KVGroupTransform<K, T, NewT>;
/**
 * Return a transformation function for use in group operation to guarantee distinct elements for each group, following the informed grouping mapper
 * @param valueMapper maps the value for a Iterable of values. Useful if you need to flat map your values per group somehow
 * @param valueDistinctMapper must return the unicity key. The unicity is respected by group
 */
export declare function getGroupingDistinct<K, T, NewT = T[]>(valueMapper: Mapper<T, Iterable<NewT>>, valueDistinctMapper?: Mapper<NewT, unknown> | keyof NewT): KVGroupTransform<K, T, NewT>;