import type { Comparator } from "./ord.ts";
export declare function union<T>(larger: T[], smaller: T[]): T[];
export declare function intersection<T>(a: T[], b: T[]): T[];
export declare function isArrayEmpty<T>(arr: T[]): arr is [];
export declare function createArrayComparator<T>(compare: (a: T, b: T) => number): (a: T[], b: T[]) => number;
/**
 * Function type for removing duplicates from an array.
 */
export type Deduplicator<T> = (data: T[]) => T[];
export interface DeduplicatorOptions {
    /** @default 12 */
    threshold?: number;
}
export declare function createDeduplicator<T>(compare: Comparator<T>, { threshold }?: DeduplicatorOptions): Deduplicator<T>;
/**
 * Function type for intersecting two arrays of the same type.
 */
export type Intersector<T> = (a: T[], b: T[]) => T[];
export declare function createIntersector<T>(compare: Comparator<T>): Intersector<T>;
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