/**
 * Helper function to conform to 4 (px) minor scale.
 * @param {number} x — unitless number
 * @return {number} - unitless number
 * @example
 * minorScale(3) => 3*4 = 12
 * minorScale(1) => 1*4 = 4
 */
export default function minorScale(x: number): number;