all these changes

frontend/node_modules/@turf/flatten/dist/js/index.js

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+'use strict';
+
+var meta = require('@turf/meta');
+var helpers = require('@turf/helpers');
+
+/**
+ * Flattens any {@link GeoJSON} to a {@link FeatureCollection} inspired by [geojson-flatten](https://github.com/tmcw/geojson-flatten).
+ *
+ * @name flatten
+ * @param {GeoJSON} geojson any valid GeoJSON Object
+ * @returns {FeatureCollection<any>} all Multi-Geometries are flattened into single Features
+ * @example
+ * var multiGeometry = turf.multiPolygon([
+ *   [[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]],
+ *   [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]],
+ *   [[100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2]]]
+ * ]);
+ *
+ * var flatten = turf.flatten(multiGeometry);
+ *
+ * //addToMap
+ * var addToMap = [flatten]
+ */
+function flatten(geojson) {
+  if (!geojson) throw new Error("geojson is required");
+
+  var results = [];
+  meta.flattenEach(geojson, function (feature) {
+    results.push(feature);
+  });
+  return helpers.featureCollection(results);
+}
+
+module.exports = flatten;
+module.exports.default = flatten;