jtBaseApp/node_modules/proj4/lib/checkSanity.js

export default function (point) {
  checkCoord(point.x);
  checkCoord(point.y);
}
function checkCoord(num) {
  if (typeof Number.isFinite === 'function') {
    if (Number.isFinite(num)) {
      return;
    }
    throw new TypeError('coordinates must be finite numbers');
  }
  if (typeof num !== 'number' || num !== num || !isFinite(num)) {
    throw new TypeError('coordinates must be finite numbers');
  }
}