export interface IKeyValues<K, T> {
    key: K;
    values: T[];
}
export declare class ArrayHelper {
    /**
     * This method groups given array by specified key, it performs
     * best with array with sorted key
     * @param a input array
     * @param keySelector key selector
     */
    static groupBy<K, T>(a: T[], keySelector: (item: T) => K): Array<IKeyValues<K, T>>;
}
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