Index: frontend/node_modules/convert-source-map/index.js
===================================================================
--- frontend/node_modules/convert-source-map/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/convert-source-map/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,233 @@
+'use strict';
+
+Object.defineProperty(exports, 'commentRegex', {
+  get: function getCommentRegex () {
+    // Groups: 1: media type, 2: MIME type, 3: charset, 4: encoding, 5: data.
+    return /^\s*?\/[\/\*][@#]\s+?sourceMappingURL=data:(((?:application|text)\/json)(?:;charset=([^;,]+?)?)?)?(?:;(base64))?,(.*?)$/mg;
+  }
+});
+
+
+Object.defineProperty(exports, 'mapFileCommentRegex', {
+  get: function getMapFileCommentRegex () {
+    // Matches sourceMappingURL in either // or /* comment styles.
+    return /(?:\/\/[@#][ \t]+?sourceMappingURL=([^\s'"`]+?)[ \t]*?$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^*]+?)[ \t]*?(?:\*\/){1}[ \t]*?$)/mg;
+  }
+});
+
+var decodeBase64;
+if (typeof Buffer !== 'undefined') {
+  if (typeof Buffer.from === 'function') {
+    decodeBase64 = decodeBase64WithBufferFrom;
+  } else {
+    decodeBase64 = decodeBase64WithNewBuffer;
+  }
+} else {
+  decodeBase64 = decodeBase64WithAtob;
+}
+
+function decodeBase64WithBufferFrom(base64) {
+  return Buffer.from(base64, 'base64').toString();
+}
+
+function decodeBase64WithNewBuffer(base64) {
+  if (typeof value === 'number') {
+    throw new TypeError('The value to decode must not be of type number.');
+  }
+  return new Buffer(base64, 'base64').toString();
+}
+
+function decodeBase64WithAtob(base64) {
+  return decodeURIComponent(escape(atob(base64)));
+}
+
+function stripComment(sm) {
+  return sm.split(',').pop();
+}
+
+function readFromFileMap(sm, read) {
+  var r = exports.mapFileCommentRegex.exec(sm);
+  // for some odd reason //# .. captures in 1 and /* .. */ in 2
+  var filename = r[1] || r[2];
+
+  try {
+    var sm = read(filename);
+    if (sm != null && typeof sm.catch === 'function') {
+      return sm.catch(throwError);
+    } else {
+      return sm;
+    }
+  } catch (e) {
+    throwError(e);
+  }
+
+  function throwError(e) {
+    throw new Error('An error occurred while trying to read the map file at ' + filename + '\n' + e.stack);
+  }
+}
+
+function Converter (sm, opts) {
+  opts = opts || {};
+
+  if (opts.hasComment) {
+    sm = stripComment(sm);
+  }
+
+  if (opts.encoding === 'base64') {
+    sm = decodeBase64(sm);
+  } else if (opts.encoding === 'uri') {
+    sm = decodeURIComponent(sm);
+  }
+
+  if (opts.isJSON || opts.encoding) {
+    sm = JSON.parse(sm);
+  }
+
+  this.sourcemap = sm;
+}
+
+Converter.prototype.toJSON = function (space) {
+  return JSON.stringify(this.sourcemap, null, space);
+};
+
+if (typeof Buffer !== 'undefined') {
+  if (typeof Buffer.from === 'function') {
+    Converter.prototype.toBase64 = encodeBase64WithBufferFrom;
+  } else {
+    Converter.prototype.toBase64 = encodeBase64WithNewBuffer;
+  }
+} else {
+  Converter.prototype.toBase64 = encodeBase64WithBtoa;
+}
+
+function encodeBase64WithBufferFrom() {
+  var json = this.toJSON();
+  return Buffer.from(json, 'utf8').toString('base64');
+}
+
+function encodeBase64WithNewBuffer() {
+  var json = this.toJSON();
+  if (typeof json === 'number') {
+    throw new TypeError('The json to encode must not be of type number.');
+  }
+  return new Buffer(json, 'utf8').toString('base64');
+}
+
+function encodeBase64WithBtoa() {
+  var json = this.toJSON();
+  return btoa(unescape(encodeURIComponent(json)));
+}
+
+Converter.prototype.toURI = function () {
+  var json = this.toJSON();
+  return encodeURIComponent(json);
+};
+
+Converter.prototype.toComment = function (options) {
+  var encoding, content, data;
+  if (options != null && options.encoding === 'uri') {
+    encoding = '';
+    content = this.toURI();
+  } else {
+    encoding = ';base64';
+    content = this.toBase64();
+  }
+  data = 'sourceMappingURL=data:application/json;charset=utf-8' + encoding + ',' + content;
+  return options != null && options.multiline ? '/*# ' + data + ' */' : '//# ' + data;
+};
+
+// returns copy instead of original
+Converter.prototype.toObject = function () {
+  return JSON.parse(this.toJSON());
+};
+
+Converter.prototype.addProperty = function (key, value) {
+  if (this.sourcemap.hasOwnProperty(key)) throw new Error('property "' + key + '" already exists on the sourcemap, use set property instead');
+  return this.setProperty(key, value);
+};
+
+Converter.prototype.setProperty = function (key, value) {
+  this.sourcemap[key] = value;
+  return this;
+};
+
+Converter.prototype.getProperty = function (key) {
+  return this.sourcemap[key];
+};
+
+exports.fromObject = function (obj) {
+  return new Converter(obj);
+};
+
+exports.fromJSON = function (json) {
+  return new Converter(json, { isJSON: true });
+};
+
+exports.fromURI = function (uri) {
+  return new Converter(uri, { encoding: 'uri' });
+};
+
+exports.fromBase64 = function (base64) {
+  return new Converter(base64, { encoding: 'base64' });
+};
+
+exports.fromComment = function (comment) {
+  var m, encoding;
+  comment = comment
+    .replace(/^\/\*/g, '//')
+    .replace(/\*\/$/g, '');
+  m = exports.commentRegex.exec(comment);
+  encoding = m && m[4] || 'uri';
+  return new Converter(comment, { encoding: encoding, hasComment: true });
+};
+
+function makeConverter(sm) {
+  return new Converter(sm, { isJSON: true });
+}
+
+exports.fromMapFileComment = function (comment, read) {
+  if (typeof read === 'string') {
+    throw new Error(
+      'String directory paths are no longer supported with `fromMapFileComment`\n' +
+      'Please review the Upgrading documentation at https://github.com/thlorenz/convert-source-map#upgrading'
+    )
+  }
+
+  var sm = readFromFileMap(comment, read);
+  if (sm != null && typeof sm.then === 'function') {
+    return sm.then(makeConverter);
+  } else {
+    return makeConverter(sm);
+  }
+};
+
+// Finds last sourcemap comment in file or returns null if none was found
+exports.fromSource = function (content) {
+  var m = content.match(exports.commentRegex);
+  return m ? exports.fromComment(m.pop()) : null;
+};
+
+// Finds last sourcemap comment in file or returns null if none was found
+exports.fromMapFileSource = function (content, read) {
+  if (typeof read === 'string') {
+    throw new Error(
+      'String directory paths are no longer supported with `fromMapFileSource`\n' +
+      'Please review the Upgrading documentation at https://github.com/thlorenz/convert-source-map#upgrading'
+    )
+  }
+  var m = content.match(exports.mapFileCommentRegex);
+  return m ? exports.fromMapFileComment(m.pop(), read) : null;
+};
+
+exports.removeComments = function (src) {
+  return src.replace(exports.commentRegex, '');
+};
+
+exports.removeMapFileComments = function (src) {
+  return src.replace(exports.mapFileCommentRegex, '');
+};
+
+exports.generateMapFileComment = function (file, options) {
+  var data = 'sourceMappingURL=' + file;
+  return options && options.multiline ? '/*# ' + data + ' */' : '//# ' + data;
+};