/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2018 Photon Storm Ltd.
 * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
 */
/**
 * Calculate the perpendicular slope of the given line.
 *
 * @function Phaser.Geom.Line.PerpSlope
 * @since 3.0.0
 *
 * @param {Phaser.Geom.Line} line - The line to calculate the perpendicular slope of.
 *
 * @return {number} The perpendicular slope of the line.
 */
declare var PerpSlope: (line: any) => number;