code: function merge (inputs) {
      var output = {
          type: 'FeatureCollection',
          features: []
      };
      for (var i = 0; i < inputs.length; i++) {
          var normalized = normalize(inputs[i]);
          for (var j = 0; j < normalized.features.length; j++) {
              output.features.push(normalized.features[j]);
          }
      }
      return output;
  }
docs: Merge a series of GeoJSON objects into one FeatureCollection containing all
  features in all files.  The objects can be any valid GeoJSON root object,
  including FeatureCollection, Feature, and Geometry types.
  
  @param {Array<Object>} inputs a list of GeoJSON objects of any type
  @return {Object} a geojson FeatureCollection.
  @example
  var geojsonMerge = require('@mapbox/geojson-merge');
  
  var mergedGeoJSON = geojsonMerge.merge([
  { type: 'Point', coordinates: [0, 1] },
  { type: 'Feature', geometry: { type: 'Point', coordinates: [0, 1] }, properties: {} }
  ]);
  
  console.log(JSON.stringify(mergedGeoJSON));