/**
 * Transpose a nested 2D array
 * @param matrix - The matrix-liked 2D nested array to be transposed
 * @return The transposed 2D nested matrix-like array
 */
export declare const array2dTranspose: <T = unknown>(matrix: T[][]) => T[][];
/**
 * Clear an array without while keeping it's reference
 * @param a - Array to be cleared
 * @return The array itself
 */
export declare const clearArray: <T>(a: T[]) => T[];
/**
 * Check if two arrays contain the same elements
 * @param a - First array
 * @param b - Second array
 * @return If `true` the two arrays contain the same elements
 */
export declare const hasSameElements: <T>(a: T[], b: T[]) => boolean;
/**
 * Return unique values of an array
 * @param a - Input array
 * @return Array with unique values
 */
export declare const unique: <T>(a: T[], getter?: (v: T) => T) => T[];