/**
 * Export the points as an array of flat numbers, following the sequence [ x,y, x,y, x,y ]
 *
 * @method Phaser.Polygon#toNumberArray
 * @param {array} [output] - The array to append the points to. If not specified a new array will be created.
 * @return {array} The flattened array.
 */
export default function (polygon: any, output: any): any;