/**
 * Shuffles all elements in a 2D array while maintaining the row lengths
 * @param array The 2D array to shuffle
 * @returns A new 2D array with shuffled elements
 * @example
 * shuffle2DArray([[1, 2], [3, 4], [5, 6]]);
 * // Result: [[1, 3], [6, 4], [2, 5]]
 */
export declare const shuffle2DArray: <T>(array: T[][]) => T[][];