/**
 * Remove duplicates from array
 */
export declare function unique<T>(array: T[]): T[];
/**
 * Remove duplicates from array of objects by key
 */
export declare function uniqueBy<T>(array: T[], keyFn: (item: T) => any): T[];
/**
 * Group array items by key function
 */
export declare function groupBy<T, K extends string | number | symbol>(array: T[], keyFn: (item: T) => K): Record<K, T[]>;
/**
 * Sort array by multiple criteria
 */
export declare function sortBy<T>(array: T[], ...keyFns: ((item: T) => any)[]): T[];
/**
 * Partition array into two groups based on predicate
 */
export declare function partition<T>(array: T[], predicate: (item: T) => boolean): [T[], T[]];
/**
 * Find item in array by predicate, or return default value
 */
export declare function findOrDefault<T>(array: T[], predicate: (item: T) => boolean, defaultValue: T): T;
/**
 * Get random sample from array
 */
export declare function sample<T>(array: T[], count?: number): T[];
/**
 * Create chunks of specified size from array
 */
export declare function chunk<T>(array: T[], size: number): T[][];
/**
 * Flatten nested arrays
 */
export declare function flatten<T>(arrays: T[][]): T[];
/**
 * Deep flatten nested arrays
 */
export declare function flattenDeep<T>(arrays: any[]): T[];
/**
 * Create sliding window of specified size
 */
export declare function slidingWindow<T>(array: T[], size: number): T[][];
/**
 * Calculate intersection of multiple arrays
 */
export declare function intersection<T>(...arrays: T[][]): T[];
/**
 * Calculate union of multiple arrays
 */
export declare function union<T>(...arrays: T[][]): T[];
/**
 * Calculate difference between arrays
 */
export declare function difference<T>(array1: T[], array2: T[]): T[];
/**
 * Move item from one index to another
 */
export declare function move<T>(array: T[], fromIndex: number, toIndex: number): T[];
/**
 * Rotate array by specified number of positions
 */
export declare function rotate<T>(array: T[], positions: number): T[];
/**
 * Check if array is empty
 */
export declare function isEmpty<T>(array: T[]): boolean;
/**
 * Get last element of array safely
 */
export declare function last<T>(array: T[]): T | undefined;
/**
 * Get first element of array safely
 */
export declare function first<T>(array: T[]): T | undefined;
/**
 * Remove item from array by value
 */
export declare function remove<T>(array: T[], item: T): T[];
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