/**
 * Removes duplicate elements from an array based on a comparison key or natural ordering
 * @template T - Element type
 * @param {T[]} array - Input array to process
 * @param {((item: T) => any | number | bigint)} [distinctKey] - Function to extract comparison key from elements
 * @param {boolean} [keepOrder=true] - Preserve original element order
 * @returns {T[]} - Array with duplicates removed
 */
export declare function distinct<T>(array: T[], distinctKey?: (item: T) => any | number | bigint, keepOrder?: true): T[];
/**
 * Specialized version of distinct for string comparisons
 * @template T - Element type
 * @param {T[]} array - Input array to process
 * @param {((item: T) => string)} [distinctKey] - Function to extract string key from elements
 * @param {boolean} [keepOrder=true] - Preserve original element order
 * @returns {T[]} - Array with duplicates removed using string comparison
 */
export declare function distinctStrings<T>(array: T[], distinctKey?: (item: T) => string, keepOrder?: true): T[];
/**
 * Core distinct implementation using custom comparison logic
 * @template T - Element type
 * @param {T[]} array - Input array to process
 * @param {(a: T, b: T) => number} [compare] - Comparison function for ordering
 * @param {boolean} [keepOrder=true] - Preserve original element order
 * @returns {T[]} - Array with duplicates removed according to comparison logic
 */
export declare function distinctWithCompareFn<T>(array: T[], compare?: (a: T, b: T) => number, keepOrder?: true): T[];