code: function detectGeoCSV(buf) {
      var lines = buf.toString()
          .split(/\r\n|\r|\n/g)
          .filter(function(line) {
              return line !== '';
          });
  
      return lines.length > 0 &&
          // if the CSV file begins with {"type":, it's more likely
          // a GeoJSON file
          !lines[0].substring(0, 50).match(/^\s*\{\s*"type"\s*:/) &&
          detectGeometryField(lines[0]
              .split(detectSeparator(lines[0]))
              .map(function(header) {
                  return header.replace(/"/g, '');
              }));
  
  }
docs: Determine whether an input is a CSV file that could be
  put on a map: that it has geographical information
  that amounts to points or geography.
  @param {string|Buffer} buf input, an upload that could be any format
  @returns {boolean} whether the content is or is not geographic
  @example
  var detect = require('@mapbox/detect-geocsv');
  var buffer = fs.readFileSync('path/to/data/file.csv');
  var isgeocsv = detect(buffer);
  assert.ok(isgeocsv);