/**
 * Conserve aspect ratio of the original region. Useful when shrinking
 * images to fit into a certain area.
 *
 * @param {Number} srcWidth width of source image
 * @param {Number} srcHeight height of source image
 * @param {Number} maxWidth maximum available width
 * @param {Number} maxHeight maximum available height
 * @return {Object} { width, height }
 */
export default function calculateAspectRatioFit(srcWidth: number, srcHeight: number, maxWidth: number, maxHeight: number): any;