import MapIterable from '../MapIterable';
import { IndexedSelector } from '../IndexedSelector';
import { EqualityComparer } from '../blinq';
declare module '../Enumerable' {
    interface Enumerable<T> {
        toLookup<T, TKey>(this: Enumerable<T>, keySelector: IndexedSelector<T, TKey>, equalityComparer?: EqualityComparer<TKey>): MapIterable<TKey, Enumerable<T>>;
        toLookup<T, TKey, TValue>(this: Enumerable<T>, keySelector: IndexedSelector<T, TKey>, valueSelector: IndexedSelector<T, TValue>, equalityComparer?: EqualityComparer<TKey>): MapIterable<TKey, Enumerable<TValue>>;
    }
}