import { Bits } from '../types';
/**
 * Converts a bit array to a string. If defined, inserts spacer every spacing characters, but never inserts it as the last substring.
 *
 * @example
 * toString([1,0,1,0,1,0], 2, '_') => '10_10_10'
 *
 * @param {Array} bits the bits to convert
 * @param {Number} spacing where to place the spacers
 * @param {Number} spacer the string used as a spacer
 * @return {String}
 */
declare const _default: (bits: Bits, spacing?: number, spacer?: string) => string;
export default _default;