diff --git a/package-lock.json b/package-lock.json
index ce50d3e..faf62b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1446,12 +1446,6 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
-    "@types/eslint-visitor-keys": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
-      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
-      "dev": true
-    },
     "@types/graceful-fs": {
       "version": "4.1.4",
       "resolved": "https://registry.npmjs.org/@types/graceful-fs/-/graceful-fs-4.1.4.tgz",
@@ -1734,30 +1728,26 @@
         }
       }
     },
-    "@typescript-eslint/experimental-utils": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-3.10.1.tgz",
-      "integrity": "sha512-DewqIgscDzmAfd5nOGe4zm6Bl7PKtMG2Ad0KG8CUZAHlXfAKTF9Ol5PXhiMh39yRL2ChRH1cuuUGOcVyyrhQIw==",
+    "@typescript-eslint/parser": {
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.8.1.tgz",
+      "integrity": "sha512-QND8XSVetATHK9y2Ltc/XBl5Ro7Y62YuZKnPEwnNPB8E379fDsvzJ1dMJ46fg/VOmk0hXhatc+GXs5MaXuL5Uw==",
       "dev": true,
       "requires": {
-        "@types/json-schema": "^7.0.3",
-        "@typescript-eslint/types": "3.10.1",
-        "@typescript-eslint/typescript-estree": "3.10.1",
-        "eslint-scope": "^5.0.0",
-        "eslint-utils": "^2.0.0"
+        "@typescript-eslint/scope-manager": "4.8.1",
+        "@typescript-eslint/types": "4.8.1",
+        "@typescript-eslint/typescript-estree": "4.8.1",
+        "debug": "^4.1.1"
       }
     },
-    "@typescript-eslint/parser": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-3.10.1.tgz",
-      "integrity": "sha512-Ug1RcWcrJP02hmtaXVS3axPPTTPnZjupqhgj+NnZ6BCkwSImWk/283347+x9wN+lqOdK9Eo3vsyiyDHgsmiEJw==",
+    "@typescript-eslint/scope-manager": {
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.8.1.tgz",
+      "integrity": "sha512-r0iUOc41KFFbZdPAdCS4K1mXivnSZqXS5D9oW+iykQsRlTbQRfuFRSW20xKDdYiaCoH+SkSLeIF484g3kWzwOQ==",
       "dev": true,
       "requires": {
-        "@types/eslint-visitor-keys": "^1.0.0",
-        "@typescript-eslint/experimental-utils": "3.10.1",
-        "@typescript-eslint/types": "3.10.1",
-        "@typescript-eslint/typescript-estree": "3.10.1",
-        "eslint-visitor-keys": "^1.1.0"
+        "@typescript-eslint/types": "4.8.1",
+        "@typescript-eslint/visitor-keys": "4.8.1"
       }
     },
     "@typescript-eslint/scope-manager": {
@@ -1795,21 +1785,21 @@
       }
     },
     "@typescript-eslint/types": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-3.10.1.tgz",
-      "integrity": "sha512-+3+FCUJIahE9q0lDi1WleYzjCwJs5hIsbugIgnbB+dSCYUxl8L6PwmsyOPFZde2hc1DlTo/xnkOgiTLSyAbHiQ==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.8.1.tgz",
+      "integrity": "sha512-ave2a18x2Y25q5K05K/U3JQIe2Av4+TNi/2YuzyaXLAsDx6UZkz1boZ7nR/N6Wwae2PpudTZmHFXqu7faXfHmA==",
       "dev": true
     },
     "@typescript-eslint/typescript-estree": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-3.10.1.tgz",
-      "integrity": "sha512-QbcXOuq6WYvnB3XPsZpIwztBoquEYLXh2MtwVU+kO8jgYCiv4G5xrSP/1wg4tkvrEE+esZVquIPX/dxPlePk1w==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.8.1.tgz",
+      "integrity": "sha512-bJ6Fn/6tW2g7WIkCWh3QRlaSU7CdUUK52shx36/J7T5oTQzANvi6raoTsbwGM11+7eBbeem8hCCKbyvAc0X3sQ==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/types": "3.10.1",
-        "@typescript-eslint/visitor-keys": "3.10.1",
+        "@typescript-eslint/types": "4.8.1",
+        "@typescript-eslint/visitor-keys": "4.8.1",
         "debug": "^4.1.1",
-        "glob": "^7.1.6",
+        "globby": "^11.0.1",
         "is-glob": "^4.0.1",
         "lodash": "^4.17.15",
         "semver": "^7.3.2",
@@ -1825,12 +1815,21 @@
       }
     },
     "@typescript-eslint/visitor-keys": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-3.10.1.tgz",
-      "integrity": "sha512-9JgC82AaQeglebjZMgYR5wgmfUdUc+EitGUUMW8u2nDckaeimzW+VsoLV6FoimPv2id3VQzfjwBxEMVz08ameQ==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.8.1.tgz",
+      "integrity": "sha512-3nrwXFdEYALQh/zW8rFwP4QltqsanCDz4CwWMPiIZmwlk9GlvBeueEIbq05SEq4ganqM0g9nh02xXgv5XI3PeQ==",
       "dev": true,
       "requires": {
-        "eslint-visitor-keys": "^1.1.0"
+        "@typescript-eslint/types": "4.8.1",
+        "eslint-visitor-keys": "^2.0.0"
+      },
+      "dependencies": {
+        "eslint-visitor-keys": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz",
+          "integrity": "sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==",
+          "dev": true
+        }
       }
     },
     "@vercel/ncc": {
diff --git a/package.json b/package.json
index e16d849..84c41ac 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "@types/jest": "^26.0.10",
     "@types/node": "^14.10.0",
     "@types/xmldom": "^0.1.30",
-    "@typescript-eslint/parser": "^3.10.1",
+    "@typescript-eslint/parser": "^4.8.1",
     "@vercel/ncc": "^0.23.0",
     "eslint": "^7.8.1",
     "eslint-plugin-github": "^4.1.1",
diff --git a/tsconfig.json b/tsconfig.json
index f6e7cb5..e94af7a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,8 @@
 {
   "compilerOptions": {
+    "lib": [
+      "dom"
+    ],
     "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     "outDir": "./lib",                        /* Redirect output structure to the directory. */