all these changes

frontend/node_modules/@turf/difference/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 TurfJS
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

frontend/node_modules/@turf/difference/README.md

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+# @turf/difference
+
+<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
+
+## difference
+
+Finds the difference between two [polygons][1] by clipping the second polygon from the first.
+
+**Parameters**
+
+-   `polygon1` **[Feature][2]&lt;([Polygon][3] \| [MultiPolygon][4])>** input Polygon feature
+-   `polygon2` **[Feature][2]&lt;([Polygon][3] \| [MultiPolygon][4])>** Polygon feature to difference from polygon1
+
+**Examples**
+
+```javascript
+var polygon1 = turf.polygon([[
+  [128, -26],
+  [141, -26],
+  [141, -21],
+  [128, -21],
+  [128, -26]
+]], {
+  "fill": "#F00",
+  "fill-opacity": 0.1
+});
+var polygon2 = turf.polygon([[
+  [126, -28],
+  [140, -28],
+  [140, -20],
+  [126, -20],
+  [126, -28]
+]], {
+  "fill": "#00F",
+  "fill-opacity": 0.1
+});
+
+var difference = turf.difference(polygon1, polygon2);
+
+//addToMap
+var addToMap = [polygon1, polygon2, difference];
+```
+
+Returns **([Feature][2]&lt;([Polygon][3] \| [MultiPolygon][4])> | null)** a Polygon or MultiPolygon feature showing the area of `polygon1` excluding the area of `polygon2` (if empty returns `null`)
+
+[1]: https://tools.ietf.org/html/rfc7946#section-3.1.6
+
+[2]: https://tools.ietf.org/html/rfc7946#section-3.2
+
+[3]: https://tools.ietf.org/html/rfc7946#section-3.1.6
+
+[4]: https://tools.ietf.org/html/rfc7946#section-3.1.7
+
+<!-- This file is automatically generated. Please don't edit it directly:
+if you find an error, edit the source file (likely index.js), and re-run
+./scripts/generate-readmes in the turf project. -->
+
+---
+
+This module is part of the [Turfjs project](http://turfjs.org/), an open source
+module collection dedicated to geographic algorithms. It is maintained in the
+[Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create
+PRs and issues.
+
+### Installation
+
+Install this module individually:
+
+```sh
+$ npm install @turf/difference
+```
+
+Or install the Turf module that includes it as a function:
+
+```sh
+$ npm install @turf/turf
+```

frontend/node_modules/@turf/difference/dist/es/index.js

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+import polygonClipping from 'polygon-clipping';
+import { polygon, multiPolygon } from '@turf/helpers';
+import { getGeom } from '@turf/invariant';
+
+/**
+ * Finds the difference between two {@link Polygon|polygons} by clipping the second polygon from the first.
+ *
+ * @name difference
+ * @param {Feature<Polygon|MultiPolygon>} polygon1 input Polygon feature
+ * @param {Feature<Polygon|MultiPolygon>} polygon2 Polygon feature to difference from polygon1
+ * @returns {Feature<Polygon|MultiPolygon>|null} a Polygon or MultiPolygon feature showing the area of `polygon1` excluding the area of `polygon2` (if empty returns `null`)
+ * @example
+ * var polygon1 = turf.polygon([[
+ *   [128, -26],
+ *   [141, -26],
+ *   [141, -21],
+ *   [128, -21],
+ *   [128, -26]
+ * ]], {
+ *   "fill": "#F00",
+ *   "fill-opacity": 0.1
+ * });
+ * var polygon2 = turf.polygon([[
+ *   [126, -28],
+ *   [140, -28],
+ *   [140, -20],
+ *   [126, -20],
+ *   [126, -28]
+ * ]], {
+ *   "fill": "#00F",
+ *   "fill-opacity": 0.1
+ * });
+ *
+ * var difference = turf.difference(polygon1, polygon2);
+ *
+ * //addToMap
+ * var addToMap = [polygon1, polygon2, difference];
+ */
+function difference(polygon1, polygon2) {
+  var geom1 = getGeom(polygon1);
+  var geom2 = getGeom(polygon2);
+  var properties = polygon1.properties || {};
+
+  var differenced = polygonClipping.difference(
+    geom1.coordinates,
+    geom2.coordinates
+  );
+  if (differenced.length === 0) return null;
+  if (differenced.length === 1) return polygon(differenced[0], properties);
+  return multiPolygon(differenced, properties);
+}
+
+export default difference;

frontend/node_modules/@turf/difference/dist/es/package.json

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+{"type":"module"}

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

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+'use strict';
+
+var polygonClipping = require('polygon-clipping');
+var helpers = require('@turf/helpers');
+var invariant = require('@turf/invariant');
+
+function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
+
+var polygonClipping__default = /*#__PURE__*/_interopDefaultLegacy(polygonClipping);
+
+/**
+ * Finds the difference between two {@link Polygon|polygons} by clipping the second polygon from the first.
+ *
+ * @name difference
+ * @param {Feature<Polygon|MultiPolygon>} polygon1 input Polygon feature
+ * @param {Feature<Polygon|MultiPolygon>} polygon2 Polygon feature to difference from polygon1
+ * @returns {Feature<Polygon|MultiPolygon>|null} a Polygon or MultiPolygon feature showing the area of `polygon1` excluding the area of `polygon2` (if empty returns `null`)
+ * @example
+ * var polygon1 = turf.polygon([[
+ *   [128, -26],
+ *   [141, -26],
+ *   [141, -21],
+ *   [128, -21],
+ *   [128, -26]
+ * ]], {
+ *   "fill": "#F00",
+ *   "fill-opacity": 0.1
+ * });
+ * var polygon2 = turf.polygon([[
+ *   [126, -28],
+ *   [140, -28],
+ *   [140, -20],
+ *   [126, -20],
+ *   [126, -28]
+ * ]], {
+ *   "fill": "#00F",
+ *   "fill-opacity": 0.1
+ * });
+ *
+ * var difference = turf.difference(polygon1, polygon2);
+ *
+ * //addToMap
+ * var addToMap = [polygon1, polygon2, difference];
+ */
+function difference(polygon1, polygon2) {
+  var geom1 = invariant.getGeom(polygon1);
+  var geom2 = invariant.getGeom(polygon2);
+  var properties = polygon1.properties || {};
+
+  var differenced = polygonClipping__default['default'].difference(
+    geom1.coordinates,
+    geom2.coordinates
+  );
+  if (differenced.length === 0) return null;
+  if (differenced.length === 1) return helpers.polygon(differenced[0], properties);
+  return helpers.multiPolygon(differenced, properties);
+}
+
+module.exports = difference;
+module.exports.default = difference;

frontend/node_modules/@turf/difference/index.d.ts

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+import { Polygon, MultiPolygon, Feature } from "@turf/helpers";
+
+/**
+ * http://turfjs.org/docs/#difference
+ */
+export default function difference(
+  polygon1: Feature<Polygon | MultiPolygon> | Polygon | MultiPolygon,
+  polygon2: Feature<Polygon | MultiPolygon> | Polygon | MultiPolygon
+): Feature<Polygon | MultiPolygon> | null;

frontend/node_modules/@turf/difference/package.json

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+{
+  "name": "@turf/difference",
+  "version": "6.5.0",
+  "description": "turf difference module",
+  "author": "Turf Authors",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/Turfjs/turf/issues"
+  },
+  "homepage": "https://github.com/Turfjs/turf",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/Turfjs/turf.git"
+  },
+  "funding": "https://opencollective.com/turf",
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "turf",
+    "gis"
+  ],
+  "main": "dist/js/index.js",
+  "module": "dist/es/index.js",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": "./dist/es/index.js",
+      "require": "./dist/js/index.js"
+    }
+  },
+  "types": "index.d.ts",
+  "sideEffects": false,
+  "files": [
+    "dist",
+    "index.d.ts"
+  ],
+  "scripts": {
+    "bench": "node -r esm bench.js",
+    "build": "rollup -c ../../rollup.config.js && echo '{\"type\":\"module\"}' > dist/es/package.json",
+    "docs": "node ../../scripts/generate-readmes",
+    "test": "npm-run-all test:*",
+    "test:tape": "node -r esm test.js"
+  },
+  "devDependencies": {
+    "benchmark": "*",
+    "glob": "*",
+    "load-json-file": "*",
+    "npm-run-all": "*",
+    "rollup": "*",
+    "tape": "*",
+    "write-json-file": "*"
+  },
+  "dependencies": {
+    "@turf/helpers": "^6.5.0",
+    "@turf/invariant": "^6.5.0",
+    "polygon-clipping": "^0.15.3"
+  },
+  "gitHead": "5375941072b90d489389db22b43bfe809d5e451e"
+}