diff --git a/lib/core/index.js b/lib/core/index.js
index 7b2345a3..bfba7b15 100644
--- a/lib/core/index.js
+++ b/lib/core/index.js
@@ -12,6 +12,8 @@ const version = require('../../package.json').version;
 const status = require('./status-handlers');
 const generateEtag = require('./etag');
 const optsParser = require('./opts');
+const htmlEncodingSniffer = require('html-encoding-sniffer');
+const { Readable } = require('stream');
 
 let httpServerCore = null;
 
@@ -234,8 +236,12 @@ module.exports = function createMiddleware(_dir, _options) {
       let cacheControl = cache;
       let stream = null;
       if (contentType && isTextFile(contentType)) {
-        // Assume text types are utf8
-        contentType += '; charset=UTF-8';
+        const htmlBytes = fs.readFileSync(file);
+        const sniffedEncoding = htmlEncodingSniffer(htmlBytes, {
+          defaultEncoding: 'UTF-8'
+        });
+        contentType += `; charset=${sniffedEncoding}`;
+        stream = Readable.from(htmlBytes)
       }
 
       if (file === gzippedFile) { // is .gz picked up
@@ -317,7 +323,10 @@ module.exports = function createMiddleware(_dir, _options) {
         return;
       }
 
-      stream = fs.createReadStream(file);
+      // stream may already have been assigned during encoding sniffing.
+      if (stream === null) {
+        stream = fs.createReadStream(file);
+      }
 
       stream.pipe(res);
       stream.on('error', (err) => {
diff --git a/package-lock.json b/package-lock.json
index 82ab10d2..87975b54 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "colors": "^1.4.0",
         "corser": "^2.0.1",
         "he": "^1.2.0",
+        "html-encoding-sniffer": "^3.0.0",
         "http-proxy": "^1.18.1",
         "mime": "^1.6.0",
         "minimist": "^1.2.5",
@@ -2515,6 +2516,17 @@
       "integrity": "sha512-mxIDAb9Lsm6DoOJ7xH+5+X4y1LU/4Hi50L9C5sIswK3JzULS4bwk1FvjdBgvYR4bzT4tuUQiC15FE2f5HbLvYw==",
       "dev": true
     },
+    "node_modules/html-encoding-sniffer": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-3.0.0.tgz",
+      "integrity": "sha512-oWv4T4yJ52iKrufjnyZPkrN0CH3QnrUqdB6In1g5Fe1mia8GmF36gnfNySxoZtxD5+NmYw1EElVXiBk93UeskA==",
+      "dependencies": {
+        "whatwg-encoding": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/html-escaper": {
       "version": "2.0.2",
       "integrity": "sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==",
@@ -4258,8 +4270,7 @@
     },
     "node_modules/safer-buffer": {
       "version": "2.1.2",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "dev": true
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
     "node_modules/secure-compare": {
       "version": "3.0.1",
@@ -6740,6 +6751,26 @@
       "integrity": "sha512-8TEXQxlldWAuIODdukIb+TR5s+9Ds40eSJrw+1iDDA9IFORPjMELarNQE3myz5XIkWWpdprmJjm1/SxMlWOC8A==",
       "dev": true
     },
+    "node_modules/whatwg-encoding": {
+      "version": "2.0.0",
+      "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-encoding/node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
@@ -6884,6 +6915,7 @@
   "dependencies": {
     "@babel/code-frame": {
       "version": "7.14.5",
+      "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
       "dev": true,
       "requires": {
         "@babel/highlight": "^7.14.5"
@@ -6891,6 +6923,7 @@
     },
     "@babel/generator": {
       "version": "7.15.4",
+      "integrity": "sha512-d3itta0tu+UayjEORPNz6e1T3FtvWlP5N4V5M+lhp/CxT4oAA7/NcScnpRyspUMLK6tu9MNHmQHxRykuN2R7hw==",
       "dev": true,
       "requires": {
         "@babel/types": "^7.15.4",
@@ -6900,12 +6933,14 @@
       "dependencies": {
         "jsesc": {
           "version": "2.5.2",
+          "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
           "dev": true
         }
       }
     },
     "@babel/helper-function-name": {
       "version": "7.15.4",
+      "integrity": "sha512-Z91cOMM4DseLIGOnog+Z8OI6YseR9bua+HpvLAQ2XayUGU+neTtX+97caALaLdyu53I/fjhbeCnWnRH1O3jFOw==",
       "dev": true,
       "requires": {
         "@babel/helper-get-function-arity": "^7.15.4",
@@ -6915,6 +6950,7 @@
     },
     "@babel/helper-get-function-arity": {
       "version": "7.15.4",
+      "integrity": "sha512-1/AlxSF92CmGZzHnC515hm4SirTxtpDnLEJ0UyEMgTMZN+6bxXKg04dKhiRx5Enel+SUA1G1t5Ed/yQia0efrA==",
       "dev": true,
       "requires": {
         "@babel/types": "^7.15.4"
@@ -6922,6 +6958,7 @@
     },
     "@babel/helper-hoist-variables": {
       "version": "7.15.4",
+      "integrity": "sha512-VTy085egb3jUGVK9ycIxQiPbquesq0HUQ+tPO0uv5mPEBZipk+5FkRKiWq5apuyTE9FUrjENB0rCf8y+n+UuhA==",
       "dev": true,
       "requires": {
         "@babel/types": "^7.15.4"
@@ -6929,6 +6966,7 @@
     },
     "@babel/helper-split-export-declaration": {
       "version": "7.15.4",
+      "integrity": "sha512-HsFqhLDZ08DxCpBdEVtKmywj6PQbwnF6HHybur0MAnkAKnlS6uHkwnmRIkElB2Owpfb4xL4NwDmDLFubueDXsw==",
       "dev": true,
       "requires": {
         "@babel/types": "^7.15.4"
@@ -6936,10 +6974,12 @@
     },
     "@babel/helper-validator-identifier": {
       "version": "7.15.7",
+      "integrity": "sha512-K4JvCtQqad9OY2+yTU8w+E82ywk/fe+ELNlt1G8z3bVGlZfn/hOcQQsUhGhW/N+tb3fxK800wLtKOE/aM0m72w==",
       "dev": true
     },
     "@babel/highlight": {
       "version": "7.14.5",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
       "dev": true,
       "requires": {
         "@babel/helper-validator-identifier": "^7.14.5",
@@ -6949,6 +6989,7 @@
       "dependencies": {
         "ansi-styles": {
           "version": "3.2.1",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
           "dev": true,
           "requires": {
             "color-convert": "^1.9.0"
@@ -6956,6 +6997,7 @@
         },
         "chalk": {
           "version": "2.4.2",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
           "dev": true,
           "requires": {
             "ansi-styles": "^3.2.1",
@@ -6965,6 +7007,7 @@
         },
         "color-convert": {
           "version": "1.9.3",
+          "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
           "dev": true,
           "requires": {
             "color-name": "1.1.3"
@@ -6972,14 +7015,17 @@
         },
         "color-name": {
           "version": "1.1.3",
+          "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
           "dev": true
         },
         "js-tokens": {
           "version": "4.0.0",
+          "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
           "dev": true
         },
         "supports-color": {
           "version": "5.5.0",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
           "dev": true,
           "requires": {
             "has-flag": "^3.0.0"
@@ -6989,10 +7035,12 @@
     },
     "@babel/parser": {
       "version": "7.15.7",
+      "integrity": "sha512-rycZXvQ+xS9QyIcJ9HXeDWf1uxqlbVFAUq0Rq0dbc50Zb/+wUe/ehyfzGfm9KZZF0kBejYgxltBXocP+gKdL2g==",
       "dev": true
     },
     "@babel/template": {
       "version": "7.15.4",
+      "integrity": "sha512-UgBAfEa1oGuYgDIPM2G+aHa4Nlo9Lh6mGD2bDBGMTbYnc38vulXPuC1MGjYILIEmlwl6Rd+BPR9ee3gm20CBtg==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.14.5",
@@ -7002,6 +7050,7 @@
     },
     "@babel/traverse": {
       "version": "7.15.4",
+      "integrity": "sha512-W6lQD8l4rUbQR/vYgSuCAE75ADyyQvOpFVsvPPdkhf6lATXAsQIG9YdtOcu8BB1dZ0LKu+Zo3c1wEcbKeuhdlA==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.14.5",
@@ -7017,6 +7066,7 @@
       "dependencies": {
         "debug": {
           "version": "4.3.2",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
           "dev": true,
           "requires": {
             "ms": "2.1.2"
@@ -7024,16 +7074,19 @@
         },
         "globals": {
           "version": "11.12.0",
+          "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==",
           "dev": true
         },
         "ms": {
           "version": "2.1.2",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
           "dev": true
         }
       }
     },
     "@babel/types": {
       "version": "7.15.6",
+      "integrity": "sha512-BPU+7QhqNjmWyDO0/vitH/CuhpV8ZmK1wpKva8nuyNF5MJfuRNWMc+hc14+u9xT93kvykMdncrJT19h74uB1Ig==",
       "dev": true,
       "requires": {
         "@babel/helper-validator-identifier": "^7.14.9",
@@ -7042,6 +7095,7 @@
       "dependencies": {
         "to-fast-properties": {
           "version": "2.0.0",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
           "dev": true
         }
       }
@@ -7150,6 +7204,7 @@
     },
     "accepts": {
       "version": "1.3.7",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
       "dev": true,
       "requires": {
         "mime-types": "~2.1.24",
@@ -7158,6 +7213,7 @@
     },
     "acorn": {
       "version": "5.7.4",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==",
       "dev": true
     },
     "acorn-jsx": {
@@ -7179,6 +7235,7 @@
     },
     "ajv": {
       "version": "6.12.6",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "dev": true,
       "requires": {
         "fast-deep-equal": "^3.1.1",
@@ -7195,14 +7252,17 @@
     },
     "ansi-regex": {
       "version": "2.1.1",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
       "dev": true
     },
     "ansi-styles": {
       "version": "2.2.1",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
     "anymatch": {
       "version": "3.1.2",
+      "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==",
       "dev": true,
       "requires": {
         "normalize-path": "^3.0.0",
@@ -7211,6 +7271,7 @@
     },
     "append-transform": {
       "version": "1.0.0",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
       "dev": true,
       "requires": {
         "default-require-extensions": "^2.0.0"
@@ -7218,14 +7279,17 @@
     },
     "archy": {
       "version": "1.0.0",
+      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
       "dev": true
     },
     "arg": {
       "version": "4.1.3",
+      "integrity": "sha512-58S9QDqG0Xx27YwPSt9fJxivjYl432YCwfDMfZ+71RAqUrZef7LrKQZ3LHLOwCS4FLNBplP533Zx895SeOCHvA==",
       "dev": true
     },
     "argparse": {
       "version": "1.0.10",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
@@ -7233,10 +7297,12 @@
     },
     "array-flatten": {
       "version": "1.1.1",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=",
       "dev": true
     },
     "asn1": {
       "version": "0.2.4",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
       "dev": true,
       "requires": {
         "safer-buffer": "~2.1.0"
@@ -7244,10 +7310,12 @@
     },
     "assert-plus": {
       "version": "1.0.0",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
       "dev": true
     },
     "async-hook-domain": {
       "version": "1.1.3",
+      "integrity": "sha512-ZovMxSbADV3+biB7oR1GL5lGyptI24alp0LWHlmz1OFc5oL47pz3EiIF6nXOkDW7yLqih4NtsiYduzdDW0i+Wg==",
       "dev": true,
       "requires": {
         "source-map-support": "^0.5.11"
@@ -7255,10 +7323,12 @@
       "dependencies": {
         "source-map": {
           "version": "0.6.1",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
           "dev": true
         },
         "source-map-support": {
           "version": "0.5.20",
+          "integrity": "sha512-n1lZZ8Ve4ksRqizaBQgxXDgKwttHDhyfQjA6YZZn8+AroHbsIz+JjwxQDxbp+7y5OYCI8t1Yk7etjD9CRd2hIw==",
           "dev": true,
           "requires": {
             "buffer-from": "^1.0.0",
@@ -7269,14 +7339,17 @@
     },
     "asynckit": {
       "version": "0.4.0",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
       "dev": true
     },
     "aws-sign2": {
       "version": "0.7.0",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
       "dev": true
     },
     "aws4": {
       "version": "1.11.0",
+      "integrity": "sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA==",
       "dev": true
     },
     "babel-code-frame": {
@@ -7300,16 +7373,19 @@
     },
     "balanced-match": {
       "version": "1.0.2",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
       "dev": true
     },
     "basic-auth": {
       "version": "2.0.1",
+      "integrity": "sha512-NF+epuEdnUYVlGuhaxbbq+dvJttwLnGY+YixlXlME5KpQ5W3CnXA5cVTneY3SPbPDRkcjMbifrwmFYcClgOZeg==",
       "requires": {
         "safe-buffer": "5.1.2"
       }
     },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
       "dev": true,
       "requires": {
         "tweetnacl": "^0.14.3"
@@ -7317,14 +7393,17 @@
     },
     "binary-extensions": {
       "version": "2.2.0",
+      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
       "dev": true
     },
     "bind-obj-methods": {
       "version": "2.0.2",
+      "integrity": "sha512-bUkRdEOppT1Xg/jG0+bp0JSjUD9U0r7skxb/42WeBUjfBpW6COQTIgQmKX5J2Z3aMXcORKgN2N+d7IQwTK3pag==",
       "dev": true
     },
     "body-parser": {
       "version": "1.19.0",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
       "dev": true,
       "requires": {
         "bytes": "3.1.0",
@@ -7341,6 +7420,7 @@
     },
     "brace-expansion": {
       "version": "1.1.11",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
@@ -7349,6 +7429,7 @@
     },
     "braces": {
       "version": "3.0.2",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
       "dev": true,
       "requires": {
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@@ -11456,6 +11823,7 @@
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@@ -11463,6 +11831,7 @@
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       "dev": true,
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@@ -11473,6 +11842,7 @@
       "dependencies": {
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           "dev": true,
           "requires": {
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@@ -11493,6 +11863,7 @@
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     "through": {
       "version": "2.3.8",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
       "dev": true
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     "tmp": {
@@ -11506,6 +11877,7 @@
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     "to-regex-range": {
       "version": "5.0.1",
+      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
       "dev": true,
       "requires": {
         "is-number": "^7.0.0"
@@ -11513,10 +11885,12 @@
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     "toidentifier": {
       "version": "1.0.0",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==",
       "dev": true
     },
     "tough-cookie": {
       "version": "2.5.0",
+      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
       "dev": true,
       "requires": {
         "psl": "^1.1.28",
@@ -11525,10 +11899,12 @@
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     "trivial-deferred": {
       "version": "1.0.1",
+      "integrity": "sha1-N21NKdlR1jaKb3oK6FwvTV4GWPM=",
       "dev": true
     },
     "ts-node": {
       "version": "8.10.2",
+      "integrity": "sha512-ISJJGgkIpDdBhWVu3jufsWpK3Rzo7bdiIXJjQc0ynKxVOVcg2oIrf2H2cejminGrptVc6q6/uynAHNCuWGbpVA==",
       "dev": true,
       "requires": {
         "arg": "^4.1.0",
@@ -11540,10 +11916,12 @@
       "dependencies": {
         "source-map": {
           "version": "0.6.1",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
           "dev": true
         },
         "source-map-support": {
           "version": "0.5.20",
+          "integrity": "sha512-n1lZZ8Ve4ksRqizaBQgxXDgKwttHDhyfQjA6YZZn8+AroHbsIz+JjwxQDxbp+7y5OYCI8t1Yk7etjD9CRd2hIw==",
           "dev": true,
           "requires": {
             "buffer-from": "^1.0.0",
@@ -11554,6 +11932,7 @@
     },
     "tunnel-agent": {
       "version": "0.6.0",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
       "dev": true,
       "requires": {
         "safe-buffer": "^5.0.1"
@@ -11561,6 +11940,7 @@
     },
     "tweetnacl": {
       "version": "0.14.5",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
       "dev": true
     },
     "type-check": {
@@ -11580,6 +11960,7 @@
     },
     "type-is": {
       "version": "1.6.18",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
       "dev": true,
       "requires": {
         "media-typer": "0.3.0",
@@ -11594,6 +11975,7 @@
     },
     "typedarray-to-buffer": {
       "version": "3.1.5",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
       "dev": true,
       "requires": {
         "is-typedarray": "^1.0.0"
@@ -11601,10 +11983,12 @@
     },
     "typescript": {
       "version": "3.9.10",
+      "integrity": "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==",
       "dev": true
     },
     "unicode-length": {
       "version": "2.0.2",
+      "integrity": "sha512-Ph/j1VbS3/r77nhoY2WU0GWGjVYOHL3xpKp0y/Eq2e5r0mT/6b649vm7KFO6RdAdrZkYLdxphYVgvODxPB+Ebg==",
       "dev": true,
       "requires": {
         "punycode": "^2.0.0",
@@ -11613,38 +11997,46 @@
     },
     "union": {
       "version": "0.5.0",
+      "integrity": "sha512-N6uOhuW6zO95P3Mel2I2zMsbsanvvtgn6jVqJv4vbVcz/JN0OkL9suomjQGmWtxJQXOCqUJvquc1sMeNz/IwlA==",
       "requires": {
         "qs": "^6.4.0"
       }
     },
     "unpipe": {
       "version": "1.0.0",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
       "dev": true
     },
     "uri-js": {
       "version": "4.4.1",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
       "dev": true,
       "requires": {
         "punycode": "^2.1.0"
       }
     },
     "url-join": {
-      "version": "4.0.1"
+      "version": "4.0.1",
+      "integrity": "sha512-jk1+QP6ZJqyOiuEI9AEWQfju/nB2Pw466kbA0LEZljHwKeMgd9WrAEgEGxjPDD2+TNbbb37rTyhEfrCXfuKXnA=="
     },
     "util-deprecate": {
       "version": "1.0.2",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
     "utils-merge": {
       "version": "1.0.1",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
       "dev": true
     },
     "uuid": {
       "version": "3.4.0",
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
       "dev": true
     },
     "validate-npm-package-license": {
       "version": "3.0.4",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
       "dev": true,
       "requires": {
         "spdx-correct": "^3.0.0",
@@ -11653,10 +12045,12 @@
     },
     "vary": {
       "version": "1.1.2",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
       "dev": true
     },
     "verror": {
       "version": "1.10.0",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
@@ -11666,12 +12060,14 @@
       "dependencies": {
         "core-util-is": {
           "version": "1.0.2",
+          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
           "dev": true
         }
       }
     },
     "vlq": {
       "version": "0.2.3",
+      "integrity": "sha512-DRibZL6DsNhIgYQ+wNdWDL2SL3bKPlVrRiBqV5yuMm++op8W4kGFtaQfCs4KEJn0wBZcHVHJ3eoywX8983k1ow==",
       "dev": true
     },
     "vscode-json-languageservice": {
@@ -11711,8 +12107,25 @@
       "integrity": "sha512-8TEXQxlldWAuIODdukIb+TR5s+9Ds40eSJrw+1iDDA9IFORPjMELarNQE3myz5XIkWWpdprmJjm1/SxMlWOC8A==",
       "dev": true
     },
+    "whatwg-encoding": {
+      "version": "2.0.0",
+      "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
+      "requires": {
+        "iconv-lite": "0.6.3"
+      },
+      "dependencies": {
+        "iconv-lite": {
+          "version": "0.6.3",
+          "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+          "requires": {
+            "safer-buffer": ">= 2.1.2 < 3.0.0"
+          }
+        }
+      }
+    },
     "which": {
       "version": "2.0.2",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
       "dev": true,
       "requires": {
         "isexe": "^2.0.0"
@@ -11720,6 +12133,7 @@
     },
     "which-module": {
       "version": "2.0.0",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
     "word-wrap": {
@@ -11730,6 +12144,7 @@
     },
     "wrap-ansi": {
       "version": "2.1.0",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
         "string-width": "^1.0.1",
@@ -11738,6 +12153,7 @@
       "dependencies": {
         "is-fullwidth-code-point": {
           "version": "1.0.0",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "requires": {
             "number-is-nan": "^1.0.0"
@@ -11745,6 +12161,7 @@
         },
         "string-width": {
           "version": "1.0.2",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
           "requires": {
             "code-point-at": "^1.0.0",
@@ -11756,6 +12173,7 @@
     },
     "wrappy": {
       "version": "1.0.2",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
     "write": {
@@ -11769,6 +12187,7 @@
     },
     "write-file-atomic": {
       "version": "3.0.3",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
       "dev": true,
       "requires": {
         "imurmurhash": "^0.1.4",
@@ -11779,22 +12198,27 @@
     },
     "y18n": {
       "version": "3.2.2",
+      "integrity": "sha512-uGZHXkHnhF0XeeAPgnKfPv1bgKAYyVvmNL1xlKsPYZPaIHxGti2hHqvOCQv71XMsLxu1QjergkqogUnms5D3YQ==",
       "dev": true
     },
     "yallist": {
       "version": "2.1.2",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
     "yaml": {
       "version": "1.10.2",
+      "integrity": "sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg==",
       "dev": true
     },
     "yapool": {
       "version": "1.0.0",
+      "integrity": "sha1-9pPymjFbUNmp2iZGp6ZkXJaYW2o=",
       "dev": true
     },
     "yargs-parser": {
       "version": "13.1.2",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
@@ -11803,12 +12227,14 @@
       "dependencies": {
         "camelcase": {
           "version": "5.3.1",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
           "dev": true
         }
       }
     },
     "yn": {
       "version": "3.1.1",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
       "dev": true
     }
   }
diff --git a/package.json b/package.json
index d08adaa3..c0d21909 100644
--- a/package.json
+++ b/package.json
@@ -89,6 +89,7 @@
     "colors": "^1.4.0",
     "corser": "^2.0.1",
     "he": "^1.2.0",
+    "html-encoding-sniffer": "^3.0.0",
     "http-proxy": "^1.18.1",
     "mime": "^1.6.0",
     "minimist": "^1.2.5",