import { IEnumerable } from '../types';
import { IGrouping } from '../types';
import { EqualityComparer } from '../types';
export declare function groupBy<TSource, TKey>(src: Iterable<TSource>, keySelector: (item: TSource) => TKey, equalityComparer?: EqualityComparer<TKey>): IEnumerable<IGrouping<TKey, TSource>>;
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