Index: frontend/node_modules/whatwg-encoding/lib/labels-to-names.json
===================================================================
--- frontend/node_modules/whatwg-encoding/lib/labels-to-names.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/whatwg-encoding/lib/labels-to-names.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,207 @@
+{
+  "866": "IBM866",
+  "unicode-1-1-utf-8": "UTF-8",
+  "utf-8": "UTF-8",
+  "utf8": "UTF-8",
+  "cp866": "IBM866",
+  "csibm866": "IBM866",
+  "ibm866": "IBM866",
+  "csisolatin2": "ISO-8859-2",
+  "iso-8859-2": "ISO-8859-2",
+  "iso-ir-101": "ISO-8859-2",
+  "iso8859-2": "ISO-8859-2",
+  "iso88592": "ISO-8859-2",
+  "iso_8859-2": "ISO-8859-2",
+  "iso_8859-2:1987": "ISO-8859-2",
+  "l2": "ISO-8859-2",
+  "latin2": "ISO-8859-2",
+  "csisolatin3": "ISO-8859-3",
+  "iso-8859-3": "ISO-8859-3",
+  "iso-ir-109": "ISO-8859-3",
+  "iso8859-3": "ISO-8859-3",
+  "iso88593": "ISO-8859-3",
+  "iso_8859-3": "ISO-8859-3",
+  "iso_8859-3:1988": "ISO-8859-3",
+  "l3": "ISO-8859-3",
+  "latin3": "ISO-8859-3",
+  "csisolatin4": "ISO-8859-4",
+  "iso-8859-4": "ISO-8859-4",
+  "iso-ir-110": "ISO-8859-4",
+  "iso8859-4": "ISO-8859-4",
+  "iso88594": "ISO-8859-4",
+  "iso_8859-4": "ISO-8859-4",
+  "iso_8859-4:1988": "ISO-8859-4",
+  "l4": "ISO-8859-4",
+  "latin4": "ISO-8859-4",
+  "csisolatincyrillic": "ISO-8859-5",
+  "cyrillic": "ISO-8859-5",
+  "iso-8859-5": "ISO-8859-5",
+  "iso-ir-144": "ISO-8859-5",
+  "iso8859-5": "ISO-8859-5",
+  "iso88595": "ISO-8859-5",
+  "iso_8859-5": "ISO-8859-5",
+  "iso_8859-5:1988": "ISO-8859-5",
+  "arabic": "ISO-8859-6",
+  "asmo-708": "ISO-8859-6",
+  "csiso88596e": "ISO-8859-6",
+  "csiso88596i": "ISO-8859-6",
+  "csisolatinarabic": "ISO-8859-6",
+  "ecma-114": "ISO-8859-6",
+  "iso-8859-6": "ISO-8859-6",
+  "iso-8859-6-e": "ISO-8859-6",
+  "iso-8859-6-i": "ISO-8859-6",
+  "iso-ir-127": "ISO-8859-6",
+  "iso8859-6": "ISO-8859-6",
+  "iso88596": "ISO-8859-6",
+  "iso_8859-6": "ISO-8859-6",
+  "iso_8859-6:1987": "ISO-8859-6",
+  "csisolatingreek": "ISO-8859-7",
+  "ecma-118": "ISO-8859-7",
+  "elot_928": "ISO-8859-7",
+  "greek": "ISO-8859-7",
+  "greek8": "ISO-8859-7",
+  "iso-8859-7": "ISO-8859-7",
+  "iso-ir-126": "ISO-8859-7",
+  "iso8859-7": "ISO-8859-7",
+  "iso88597": "ISO-8859-7",
+  "iso_8859-7": "ISO-8859-7",
+  "iso_8859-7:1987": "ISO-8859-7",
+  "sun_eu_greek": "ISO-8859-7",
+  "csiso88598e": "ISO-8859-8",
+  "csisolatinhebrew": "ISO-8859-8",
+  "hebrew": "ISO-8859-8",
+  "iso-8859-8": "ISO-8859-8",
+  "iso-8859-8-e": "ISO-8859-8",
+  "iso-ir-138": "ISO-8859-8",
+  "iso8859-8": "ISO-8859-8",
+  "iso88598": "ISO-8859-8",
+  "iso_8859-8": "ISO-8859-8",
+  "iso_8859-8:1988": "ISO-8859-8",
+  "visual": "ISO-8859-8",
+  "csisolatin6": "ISO-8859-10",
+  "iso-8859-10": "ISO-8859-10",
+  "iso-ir-157": "ISO-8859-10",
+  "iso8859-10": "ISO-8859-10",
+  "iso885910": "ISO-8859-10",
+  "l6": "ISO-8859-10",
+  "latin6": "ISO-8859-10",
+  "iso-8859-13": "ISO-8859-13",
+  "iso8859-13": "ISO-8859-13",
+  "iso885913": "ISO-8859-13",
+  "iso-8859-14": "ISO-8859-14",
+  "iso8859-14": "ISO-8859-14",
+  "iso885914": "ISO-8859-14",
+  "csisolatin9": "ISO-8859-15",
+  "iso-8859-15": "ISO-8859-15",
+  "iso8859-15": "ISO-8859-15",
+  "iso885915": "ISO-8859-15",
+  "iso_8859-15": "ISO-8859-15",
+  "l9": "ISO-8859-15",
+  "iso-8859-16": "ISO-8859-16",
+  "cskoi8r": "KOI8-R",
+  "koi": "KOI8-R",
+  "koi8": "KOI8-R",
+  "koi8-r": "KOI8-R",
+  "koi8_r": "KOI8-R",
+  "koi8-ru": "KOI8-U",
+  "koi8-u": "KOI8-U",
+  "csmacintosh": "macintosh",
+  "mac": "macintosh",
+  "macintosh": "macintosh",
+  "x-mac-roman": "macintosh",
+  "dos-874": "windows-874",
+  "iso-8859-11": "windows-874",
+  "iso8859-11": "windows-874",
+  "iso885911": "windows-874",
+  "tis-620": "windows-874",
+  "windows-874": "windows-874",
+  "cp1250": "windows-1250",
+  "windows-1250": "windows-1250",
+  "x-cp1250": "windows-1250",
+  "cp1251": "windows-1251",
+  "windows-1251": "windows-1251",
+  "x-cp1251": "windows-1251",
+  "ansi_x3.4-1968": "windows-1252",
+  "ascii": "windows-1252",
+  "cp1252": "windows-1252",
+  "cp819": "windows-1252",
+  "csisolatin1": "windows-1252",
+  "ibm819": "windows-1252",
+  "iso-8859-1": "windows-1252",
+  "iso-ir-100": "windows-1252",
+  "iso8859-1": "windows-1252",
+  "iso88591": "windows-1252",
+  "iso_8859-1": "windows-1252",
+  "iso_8859-1:1987": "windows-1252",
+  "l1": "windows-1252",
+  "latin1": "windows-1252",
+  "us-ascii": "windows-1252",
+  "windows-1252": "windows-1252",
+  "x-cp1252": "windows-1252",
+  "cp1253": "windows-1253",
+  "windows-1253": "windows-1253",
+  "x-cp1253": "windows-1253",
+  "cp1254": "windows-1254",
+  "csisolatin5": "windows-1254",
+  "iso-8859-9": "windows-1254",
+  "iso-ir-148": "windows-1254",
+  "iso8859-9": "windows-1254",
+  "iso88599": "windows-1254",
+  "iso_8859-9": "windows-1254",
+  "iso_8859-9:1989": "windows-1254",
+  "l5": "windows-1254",
+  "latin5": "windows-1254",
+  "windows-1254": "windows-1254",
+  "x-cp1254": "windows-1254",
+  "cp1255": "windows-1255",
+  "windows-1255": "windows-1255",
+  "x-cp1255": "windows-1255",
+  "cp1256": "windows-1256",
+  "windows-1256": "windows-1256",
+  "x-cp1256": "windows-1256",
+  "cp1257": "windows-1257",
+  "windows-1257": "windows-1257",
+  "x-cp1257": "windows-1257",
+  "cp1258": "windows-1258",
+  "windows-1258": "windows-1258",
+  "x-cp1258": "windows-1258",
+  "chinese": "GBK",
+  "csgb2312": "GBK",
+  "csiso58gb231280": "GBK",
+  "gb2312": "GBK",
+  "gb_2312": "GBK",
+  "gb_2312-80": "GBK",
+  "gbk": "GBK",
+  "iso-ir-58": "GBK",
+  "x-gbk": "GBK",
+  "gb18030": "gb18030",
+  "big5": "Big5",
+  "big5-hkscs": "Big5",
+  "cn-big5": "Big5",
+  "csbig5": "Big5",
+  "x-x-big5": "Big5",
+  "cseucpkdfmtjapanese": "EUC-JP",
+  "euc-jp": "EUC-JP",
+  "x-euc-jp": "EUC-JP",
+  "csshiftjis": "Shift_JIS",
+  "ms932": "Shift_JIS",
+  "ms_kanji": "Shift_JIS",
+  "shift-jis": "Shift_JIS",
+  "shift_jis": "Shift_JIS",
+  "sjis": "Shift_JIS",
+  "windows-31j": "Shift_JIS",
+  "x-sjis": "Shift_JIS",
+  "cseuckr": "EUC-KR",
+  "csksc56011987": "EUC-KR",
+  "euc-kr": "EUC-KR",
+  "iso-ir-149": "EUC-KR",
+  "korean": "EUC-KR",
+  "ks_c_5601-1987": "EUC-KR",
+  "ks_c_5601-1989": "EUC-KR",
+  "ksc5601": "EUC-KR",
+  "ksc_5601": "EUC-KR",
+  "windows-949": "EUC-KR",
+  "utf-16be": "UTF-16BE",
+  "utf-16": "UTF-16LE",
+  "utf-16le": "UTF-16LE"
+}
Index: frontend/node_modules/whatwg-encoding/lib/supported-names.json
===================================================================
--- frontend/node_modules/whatwg-encoding/lib/supported-names.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/whatwg-encoding/lib/supported-names.json	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,37 @@
+[
+  "UTF-8",
+  "IBM866",
+  "ISO-8859-2",
+  "ISO-8859-3",
+  "ISO-8859-4",
+  "ISO-8859-5",
+  "ISO-8859-6",
+  "ISO-8859-7",
+  "ISO-8859-8",
+  "ISO-8859-10",
+  "ISO-8859-13",
+  "ISO-8859-14",
+  "ISO-8859-15",
+  "ISO-8859-16",
+  "KOI8-R",
+  "KOI8-U",
+  "macintosh",
+  "windows-874",
+  "windows-1250",
+  "windows-1251",
+  "windows-1252",
+  "windows-1253",
+  "windows-1254",
+  "windows-1255",
+  "windows-1256",
+  "windows-1257",
+  "windows-1258",
+  "GBK",
+  "gb18030",
+  "Big5",
+  "EUC-JP",
+  "Shift_JIS",
+  "EUC-KR",
+  "UTF-16BE",
+  "UTF-16LE"
+]
Index: frontend/node_modules/whatwg-encoding/lib/whatwg-encoding.js
===================================================================
--- frontend/node_modules/whatwg-encoding/lib/whatwg-encoding.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/whatwg-encoding/lib/whatwg-encoding.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,47 @@
+"use strict";
+const iconvLite = require("iconv-lite");
+const supportedNames = require("./supported-names.json");
+const labelsToNames = require("./labels-to-names.json");
+
+const supportedNamesSet = new Set(supportedNames);
+
+// https://encoding.spec.whatwg.org/#concept-encoding-get
+exports.labelToName = label => {
+  label = String(label).trim().toLowerCase();
+
+  return labelsToNames[label] || null;
+};
+
+// https://encoding.spec.whatwg.org/#decode
+exports.decode = (buffer, fallbackEncodingName) => {
+  let encoding = fallbackEncodingName;
+  if (!exports.isSupported(encoding)) {
+    throw new RangeError(`"${encoding}" is not a supported encoding name`);
+  }
+
+  const bomEncoding = exports.getBOMEncoding(buffer);
+  if (bomEncoding !== null) {
+    encoding = bomEncoding;
+  }
+
+  // iconv-lite will strip BOMs for us, so no need to do the stuff the spec does
+
+  return iconvLite.decode(buffer, encoding);
+};
+
+// https://github.com/whatwg/html/issues/1910#issuecomment-254017369
+exports.getBOMEncoding = buffer => {
+  if (buffer[0] === 0xFE && buffer[1] === 0xFF) {
+    return "UTF-16BE";
+  } else if (buffer[0] === 0xFF && buffer[1] === 0xFE) {
+    return "UTF-16LE";
+  } else if (buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
+    return "UTF-8";
+  }
+
+  return null;
+};
+
+exports.isSupported = name => {
+  return supportedNamesSet.has(String(name));
+};