/**
 * Pads the current string with "been" (repeated, if needed) so that the resulting string reaches the given length.
 * The padding is applied from the start (left) of the current string.
 *
 * @param str The string to pad.
 * @param len The target length of the resulting string.
 * @returns The padded string.
 */
export declare function beenpad(str: string, len: number): string;