Get the Esri-formatted extent of a GeoJSON feature collection.
npm install esri-extent
var esriExtent = require('esri-extent')
var example = require('./test/geojson-spec-example.json')
var extent = esriExtent(example)
// OR
esriExtent(example, function (err, extent) {
if (err) throw err
console.log(extent)
// {
// xmin: 100,
// ymin: 0,
// xmax: 105,
// ymax: 1,
// spatialReference: {
// wkid: 4326,
// latestWkid: 4326
// }
// }
})