/**
 *
 * @param high
 * @param low
 * @param close
 * @param period
 * @param multiple
 * @param size
 * @returns [kc_lower, kc_middle, kc_upper]
 */
export declare function kc(high: Array<number>, low: Array<number>, close: Array<number>, period: number, multiple: number, size?: number): Promise<number[][]>;