/**
 * Returns a new array without duplicate values
 * @public
 */
export declare function arrayUnique<T>(arr: readonly T[]): T[];
/**
 * Removes duplicate values from an array
 * @public
 */
export declare function arrayUniqueReference(arr: any[]): void;
export type IUniqueIdFactory<T> = (item: T) => string;
/**
 * Returns a function to be used in <arr>.filter()
 *
 * the returned function can use multiple times, it will remember all values inter multiple arrays
 *
 * @param {IUniqueIdFactory} idFactory function takes an array element, return it's id to be compare with each other
 * @public
 */
export declare function uniqueFilter<T>(idFactory?: IUniqueIdFactory<T>): (item: T) => boolean;
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