import { IndexedSelector } from '../IndexedSelector';
import { EqualityComparer } from '../comparer/EqualityComparer';
declare module '../Enumerable' {
    interface Enumerable<T> {
        distinctBy<T, TKey>(this: Enumerable<T>, selector: IndexedSelector<T, TKey>, equalityComparer?: EqualityComparer<TKey>): Enumerable<T>;
    }
}