/**
 * Returns the distance between two points
 * @param  {Number} x1 The X position of the first point
 * @param  {Number} y1 The Y position of the first point
 * @param  {Number} x2 The X position of the second point
 * @param  {Number} y2 The Y position of the second point
 * @return {Number}
 */
export default function distance(x1: number, y1: number, x2: number, y2: number): number;
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