text: /// <reference lib="dom" />
  import { atan, cos, sin } from "../math.js";
  import { azimuthalInvert } from "./azimuthal.js";
  import projection from "./index.js";
  
  export function stereographicRaw(x, y) {
    var cy = cos(y), k = 1 + cos(x) * cy;
    return [cy * sin(x) / k, sin(y) / k];
  }
  
  stereographicRaw.invert = azimuthalInvert(function (z) {
    return 2 * atan(z);
  });
  
  export default function () {
    return projection(stereographicRaw)
      .scale(250)
      .clipAngle(142);
  }
  