diff --git a/package.json b/package.json
index 1f5165b..9a984e8 100644
--- a/package.json
+++ b/package.json
@@ -49,8 +49,8 @@
     "@rollup/plugin-replace": "^2.3.3",
     "@types/karma": "^5.0.0",
     "@types/node": "*",
-    "@typescript-eslint/eslint-plugin": "^3.9.1",
-    "@typescript-eslint/parser": "^3.9.1",
+    "@typescript-eslint/eslint-plugin": "^4.2.0",
+    "@typescript-eslint/parser": "^4.2.0",
     "browser-jest-message-util": "npm:jest-message-util@26.3.0",
     "browser-jest-snapshot": "npm:jest-snapshot@26.4.0",
     "browser-jest-util": "npm:jest-util@26.3.0",
diff --git a/yarn.lock b/yarn.lock
index 3e48a9c..bba3d21 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1766,11 +1766,6 @@
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
-"@types/eslint-visitor-keys@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
-  integrity sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==
-
 "@types/estree@0.0.39":
   version "0.0.39"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
@@ -2001,91 +1996,61 @@
   dependencies:
     "@types/yargs-parser" "*"
 
-"@typescript-eslint/eslint-plugin@^3.9.1":
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-3.9.1.tgz#8cf27b6227d12d66dd8dc1f1a4b04d1daad51c2e"
-  integrity sha512-XIr+Mfv7i4paEdBf0JFdIl9/tVxyj+rlilWIfZ97Be0lZ7hPvUbS5iHt9Glc8kRI53dsr0PcAEudbf8rO2wGgg==
+"@typescript-eslint/eslint-plugin@^4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.2.0.tgz#a3d5c11b377b7e18f3cd9c4e87d465fe9432669b"
+  integrity sha512-zBNRkzvLSwo6y5TG0DVcmshZIYBHKtmzD4N+LYnfTFpzc4bc79o8jNRSb728WV7A4Cegbs+MV5IRAj8BKBgOVQ==
   dependencies:
-    "@typescript-eslint/experimental-utils" "3.9.1"
+    "@typescript-eslint/experimental-utils" "4.2.0"
+    "@typescript-eslint/scope-manager" "4.2.0"
     debug "^4.1.1"
     functional-red-black-tree "^1.0.1"
     regexpp "^3.0.0"
     semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/experimental-utils@3.9.1":
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-3.9.1.tgz#b140b2dc7a7554a44f8a86fb6fe7cbfe57ca059e"
-  integrity sha512-lkiZ8iBBaYoyEKhCkkw4SAeatXyBq9Ece5bZXdLe1LWBUwTszGbmbiqmQbwWA8cSYDnjWXp9eDbXpf9Sn0hLAg==
-  dependencies:
-    "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/types" "3.9.1"
-    "@typescript-eslint/typescript-estree" "3.9.1"
-    eslint-scope "^5.0.0"
-    eslint-utils "^2.0.0"
-
-"@typescript-eslint/experimental-utils@^4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.0.1.tgz#7d9a3ab6821ad5274dad2186c1aa0d93afd696eb"
-  integrity sha512-gAqOjLiHoED79iYTt3F4uSHrYmg/GPz/zGezdB0jAdr6S6gwNiR/j7cTZ8nREKVzMVKLd9G3xbg1sV9GClW3sw==
+"@typescript-eslint/experimental-utils@4.2.0", "@typescript-eslint/experimental-utils@^4.0.1":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.2.0.tgz#3d0b5cd4aa61f5eb7aa1e873dea0db1410b062d2"
+  integrity sha512-5BBj6BjgHEndBaQQpUVzRIPERz03LBc0MCQkHwUaH044FJFL08SwWv/sQftk7gf0ShZ2xZysz0LTwCwNt4Xu3w==
   dependencies:
     "@types/json-schema" "^7.0.3"
-    "@typescript-eslint/scope-manager" "4.0.1"
-    "@typescript-eslint/types" "4.0.1"
-    "@typescript-eslint/typescript-estree" "4.0.1"
+    "@typescript-eslint/scope-manager" "4.2.0"
+    "@typescript-eslint/types" "4.2.0"
+    "@typescript-eslint/typescript-estree" "4.2.0"
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
-"@typescript-eslint/parser@^3.9.1":
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-3.9.1.tgz#ab7983abaea0ae138ff5671c7c7739d8a191b181"
-  integrity sha512-y5QvPFUn4Vl4qM40lI+pNWhTcOWtpZAJ8pOEQ21fTTW4xTJkRplMjMRje7LYTXqVKKX9GJhcyweMz2+W1J5bMg==
+"@typescript-eslint/parser@^4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-4.2.0.tgz#1879ef400abd73d972e20f14c3522e5b343d1d1b"
+  integrity sha512-54jJ6MwkOtowpE48C0QJF9iTz2/NZxfKVJzv1ha5imigzHbNSLN9yvbxFFH1KdlRPQrlR8qxqyOvLHHxd397VA==
   dependencies:
-    "@types/eslint-visitor-keys" "^1.0.0"
-    "@typescript-eslint/experimental-utils" "3.9.1"
-    "@typescript-eslint/types" "3.9.1"
-    "@typescript-eslint/typescript-estree" "3.9.1"
-    eslint-visitor-keys "^1.1.0"
+    "@typescript-eslint/scope-manager" "4.2.0"
+    "@typescript-eslint/types" "4.2.0"
+    "@typescript-eslint/typescript-estree" "4.2.0"
+    debug "^4.1.1"
 
-"@typescript-eslint/scope-manager@4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.0.1.tgz#24d93c3000bdfcc5a157dc4d32b742405a8631b5"
-  integrity sha512-u3YEXVJ8jsj7QCJk3om0Y457fy2euEOkkzxIB/LKU3MdyI+FJ2gI0M4aKEaXzwCSfNDiZ13a3lDo5DVozc+XLQ==
+"@typescript-eslint/scope-manager@4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.2.0.tgz#d10e6854a65e175b22a28265d372a97c8cce4bfc"
+  integrity sha512-Tb402cxxObSxWIVT+PnBp5ruT2V/36yj6gG4C9AjkgRlZpxrLAzWDk3neen6ToMBGeGdxtnfFLoJRUecGz9mYQ==
   dependencies:
-    "@typescript-eslint/types" "4.0.1"
-    "@typescript-eslint/visitor-keys" "4.0.1"
+    "@typescript-eslint/types" "4.2.0"
+    "@typescript-eslint/visitor-keys" "4.2.0"
 
-"@typescript-eslint/types@3.9.1":
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-3.9.1.tgz#b2a6eaac843cf2f2777b3f2464fb1fbce5111416"
-  integrity sha512-15JcTlNQE1BsYy5NBhctnEhEoctjXOjOK+Q+rk8ugC+WXU9rAcS2BYhoh6X4rOaXJEpIYDl+p7ix+A5U0BqPTw==
-
-"@typescript-eslint/types@4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.0.1.tgz#1cf72582f764931f085cb8230ff215980fe467b2"
-  integrity sha512-S+gD3fgbkZYW2rnbjugNMqibm9HpEjqZBZkTiI3PwbbNGWmAcxolWIUwZ0SKeG4Dy2ktpKKaI/6+HGYVH8Qrlg==
-
-"@typescript-eslint/typescript-estree@3.9.1":
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-3.9.1.tgz#fd81cada74bc8a7f3a2345b00897acb087935779"
-  integrity sha512-IqM0gfGxOmIKPhiHW/iyAEXwSVqMmR2wJ9uXHNdFpqVvPaQ3dWg302vW127sBpAiqM9SfHhyS40NKLsoMpN2KA==
-  dependencies:
-    "@typescript-eslint/types" "3.9.1"
-    "@typescript-eslint/visitor-keys" "3.9.1"
-    debug "^4.1.1"
-    glob "^7.1.6"
-    is-glob "^4.0.1"
-    lodash "^4.17.15"
-    semver "^7.3.2"
-    tsutils "^3.17.1"
+"@typescript-eslint/types@4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.2.0.tgz#6f6b094329e72040f173123832397c7c0b910fc8"
+  integrity sha512-xkv5nIsxfI/Di9eVwN+G9reWl7Me9R5jpzmZUch58uQ7g0/hHVuGUbbn4NcxcM5y/R4wuJIIEPKPDb5l4Fdmwg==
 
-"@typescript-eslint/typescript-estree@4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.0.1.tgz#29a43c7060641ec51c902d9f50ac7c5866ec479f"
-  integrity sha512-zGzleORFXrRWRJAMLTB2iJD1IZbCPkg4hsI8mGdpYlKaqzvKYSEWVAYh14eauaR+qIoZVWrXgYSXqLtTlxotiw==
+"@typescript-eslint/typescript-estree@4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.2.0.tgz#9d746240991c305bf225ad5e96cbf57e7fea0551"
+  integrity sha512-iWDLCB7z4MGkLipduF6EOotdHNtgxuNKnYD54nMS/oitFnsk4S3S/TE/UYXQTra550lHtlv9eGmp+dvN9pUDtA==
   dependencies:
-    "@typescript-eslint/types" "4.0.1"
-    "@typescript-eslint/visitor-keys" "4.0.1"
+    "@typescript-eslint/types" "4.2.0"
+    "@typescript-eslint/visitor-keys" "4.2.0"
     debug "^4.1.1"
     globby "^11.0.1"
     is-glob "^4.0.1"
@@ -2093,19 +2058,12 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/visitor-keys@3.9.1":
-  version "3.9.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-3.9.1.tgz#92af3747cdb71509199a8f7a4f00b41d636551d1"
-  integrity sha512-zxdtUjeoSh+prCpogswMwVUJfEFmCOjdzK9rpNjNBfm6EyPt99x3RrJoBOGZO23FCt0WPKUCOL5mb/9D5LjdwQ==
-  dependencies:
-    eslint-visitor-keys "^1.1.0"
-
-"@typescript-eslint/visitor-keys@4.0.1":
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.0.1.tgz#d4e8de62775f2a6db71c7e8539633680039fdd6c"
-  integrity sha512-yBSqd6FjnTzbg5RUy9J+9kJEyQjTI34JdGMJz+9ttlJzLCnGkBikxw+N5n2VDcc3CesbIEJ0MnZc5uRYnrEnCw==
+"@typescript-eslint/visitor-keys@4.2.0":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.2.0.tgz#ae13838e3a260b63ae51021ecaf1d0cdea8dbba5"
+  integrity sha512-WIf4BNOlFOH2W+YqGWa6YKLcK/EB3gEj2apCrqLw6mme1RzBy0jtJ9ewJgnrZDB640zfnv8L+/gwGH5sYp/rGw==
   dependencies:
-    "@typescript-eslint/types" "4.0.1"
+    "@typescript-eslint/types" "4.2.0"
     eslint-visitor-keys "^2.0.0"
 
 "@webassemblyjs/ast@1.9.0":