use lerc in node

lerc.js

var http = require('http');
var request = require('request');
var Lerc = require('./LercDecode');

http.get('http://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer/tile/0/0/0', function (res) {
  var data = [];
  res.on('data', function (chunk) {
    data.push(chunk);
  })
  res.on('end', function () {
    data = Buffer.concat(data);
    // <Buffer 43 6e 74 5a 49 6d 61 67 65 20 0b 00 00 00 08 00 00 00 01 01 00 00 01 01 00 00 9a 99 99 99 99 99 b9 3f 00 00 00 00 00 00 00 00 24 06 00 00 00 00 80 3f ... >
    console.log(data);
    // ArrayBuffer {}
    console.log(data.buffer);
    Lerc.decode(data.buffer);
  })
})

request('https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer/tile/0/0/0', function (error, response, body) {
    if (!error && response.statusCode == 200) {
      // no clue
      // console.log(Lerc.decode(data.buffer));
      // node buffer
      // var b = new Buffer(body);
      // ArrayBuffer http://stackoverflow.com/questions/8609289/convert-a-binary-nodejs-buffer-to-javascript-arraybuffer/31394257#31394257
      // var ab = b.buffer.slice(b.byteOffset, b.byteOffset + b.byteLength);

      // var c = new ArrayBuffer(body);
      // var d = new UInt8Array(c);
      // d.set(_another_u8_byte_array);

      // console.log(Buffer(body));
      // var ab = new ArrayBuffer(Buffer(body));
      // console.log(ab.buffer);
      //console.log(data);
      // var c = new ArrayBuffer(data.length);
      // console.log(c);
      //Lerc.decode(data);
    }
 });

couldn't make enough sense of the doc below to be successful with request

https://nodejs.org/api/buffer.html#buffer_class_method_buffer_from_buffer