diff --git a/package.json b/package.json
index 1e773644..fdb7e93e 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "@types/utf8": "^2.1.6",
     "@types/webpack": "^4.41.22",
     "@types/ws": "^7.2.6",
-    "@typescript-eslint/eslint-plugin": "^3.10.1",
+    "@typescript-eslint/eslint-plugin": "^4.0.0",
     "@typescript-eslint/parser": "^3.10.1",
     "chai": "^4.2.0",
     "deep-equal": "^2.0.3",
diff --git a/yarn.lock b/yarn.lock
index 457b07dc..b563ab4e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -208,6 +208,27 @@
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.2.tgz#26520bf09abe4a5644cd5414e37125a8954241dd"
   integrity sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw==
 
+"@nodelib/fs.scandir@2.1.3":
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz#3a582bdb53804c6ba6d146579c46e52130cf4a3b"
+  integrity sha512-eGmwYQn3gxo4r7jdQnkrrN6bY478C3P+a/y72IJukF8LjB6ZHeB3c+Ehacj3sYeSmUXGlnA67/PmbM9CVwL7Dw==
+  dependencies:
+    "@nodelib/fs.stat" "2.0.3"
+    run-parallel "^1.1.9"
+
+"@nodelib/fs.stat@2.0.3", "@nodelib/fs.stat@^2.0.2":
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.3.tgz#34dc5f4cabbc720f4e60f75a747e7ecd6c175bd3"
+  integrity sha512-bQBFruR2TAwoevBEd/NWMoAAtNGzTRgdrqnYCc7dhzfoNvqPzLyqlEQnzZ3kVnNrSp25iyxE00/3h2fqGAGArA==
+
+"@nodelib/fs.walk@^1.2.3":
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.walk/-/fs.walk-1.2.4.tgz#011b9202a70a6366e436ca5c065844528ab04976"
+  integrity sha512-1V9XOY4rDW0rehzbrcqAmHnz8e7SKvX27gh8Gt2WgB0+pdzdiLV83p72kZPU+jvMbS1qU5mauP2iOvO8rhmurQ==
+  dependencies:
+    "@nodelib/fs.scandir" "2.1.3"
+    fastq "^1.6.0"
+
 "@types/anymatch@*":
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/@types/anymatch/-/anymatch-1.3.1.tgz#336badc1beecb9dacc38bea2cf32adf627a8421a"
@@ -381,12 +402,13 @@
   dependencies:
     "@types/node" "*"
 
-"@typescript-eslint/eslint-plugin@^3.10.1":
-  version "3.10.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-3.10.1.tgz#7e061338a1383f59edc204c605899f93dc2e2c8f"
-  integrity sha512-PQg0emRtzZFWq6PxBcdxRH3QIQiyFO3WCVpRL3fgj5oQS3CDs3AeAKfv4DxNhzn8ITdNJGJ4D3Qw8eAJf3lXeQ==
+"@typescript-eslint/eslint-plugin@^4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.0.0.tgz#99349a501447fed91de18346705c0c65cf603bee"
+  integrity sha512-5e6q1TR7gS2P+8W2xndCu7gBh3BzmYEo70OyIdsmCmknHha/yNbz2vdevl+tP1uoaMOcrzg4gyrAijuV3DDBHA==
   dependencies:
-    "@typescript-eslint/experimental-utils" "3.10.1"
+    "@typescript-eslint/experimental-utils" "4.0.0"
+    "@typescript-eslint/scope-manager" "4.0.0"
     debug "^4.1.1"
     functional-red-black-tree "^1.0.1"
     regexpp "^3.0.0"
@@ -404,6 +426,18 @@
     eslint-scope "^5.0.0"
     eslint-utils "^2.0.0"
 
+"@typescript-eslint/experimental-utils@4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.0.0.tgz#fbec21a3b5ab59127edb6ce2e139ed378cc50eb5"
+  integrity sha512-hbX6zR+a/vcpFVNJYN/Nbd7gmaMosDTxHEKcvmhWeWcq/0UDifrqmCfkkodbAKL46Fn4ekSBMTyq2zlNDzcQxw==
+  dependencies:
+    "@types/json-schema" "^7.0.3"
+    "@typescript-eslint/scope-manager" "4.0.0"
+    "@typescript-eslint/types" "4.0.0"
+    "@typescript-eslint/typescript-estree" "4.0.0"
+    eslint-scope "^5.0.0"
+    eslint-utils "^2.0.0"
+
 "@typescript-eslint/parser@^3.10.1":
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-3.10.1.tgz#1883858e83e8b442627e1ac6f408925211155467"
@@ -415,11 +449,24 @@
     "@typescript-eslint/typescript-estree" "3.10.1"
     eslint-visitor-keys "^1.1.0"
 
+"@typescript-eslint/scope-manager@4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-4.0.0.tgz#8c9e3b3b8cdf5a1fbe671d9fad73ff67bc027ea8"
+  integrity sha512-9gcWUPoWo7gk/+ZQPg7L1ySRmR5HLIy3Vu6/LfhQbuzIkGm6v2CGIjpVRISoDLFRovNRDImd4aP/sa8O4yIEBg==
+  dependencies:
+    "@typescript-eslint/types" "4.0.0"
+    "@typescript-eslint/visitor-keys" "4.0.0"
+
 "@typescript-eslint/types@3.10.1":
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-3.10.1.tgz#1d7463fa7c32d8a23ab508a803ca2fe26e758727"
   integrity sha512-+3+FCUJIahE9q0lDi1WleYzjCwJs5hIsbugIgnbB+dSCYUxl8L6PwmsyOPFZde2hc1DlTo/xnkOgiTLSyAbHiQ==
 
+"@typescript-eslint/types@4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-4.0.0.tgz#ec1f9fc06b8558a1d5afa6e337182d08beece7f5"
+  integrity sha512-bK+c2VLzznX2fUWLK6pFDv3cXGTp7nHIuBMq1B9klA+QCsqLHOOqe5TQReAQDl7DN2RfH+neweo0oC5hYlG7Rg==
+
 "@typescript-eslint/typescript-estree@3.10.1":
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-3.10.1.tgz#fd0061cc38add4fad45136d654408569f365b853"
@@ -434,6 +481,20 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
+"@typescript-eslint/typescript-estree@4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-4.0.0.tgz#2244c63de2f2190bc5718eb0fb3fd2c437d42097"
+  integrity sha512-ewFMPi2pMLDNIXGMPdf8r7El2oPSZw9PEYB0j+WcpKd7AX2ARmajGa7RUHTukllWX2bj4vWX6JLE1Oih2BMokA==
+  dependencies:
+    "@typescript-eslint/types" "4.0.0"
+    "@typescript-eslint/visitor-keys" "4.0.0"
+    debug "^4.1.1"
+    globby "^11.0.1"
+    is-glob "^4.0.1"
+    lodash "^4.17.15"
+    semver "^7.3.2"
+    tsutils "^3.17.1"
+
 "@typescript-eslint/visitor-keys@3.10.1":
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-3.10.1.tgz#cd4274773e3eb63b2e870ac602274487ecd1e931"
@@ -441,6 +502,14 @@
   dependencies:
     eslint-visitor-keys "^1.1.0"
 
+"@typescript-eslint/visitor-keys@4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-4.0.0.tgz#e2bbb69d98076d6a3f06abcb2048225a74362c33"
+  integrity sha512-sTouJbv6rjVJeTE4lpSBVYXq/u5K3gbB6LKt7ccFEZPTZB/VeQ0ssUz9q5Hx++sCqBbdF8PzrrgvEnicXAR6NQ==
+  dependencies:
+    "@typescript-eslint/types" "4.0.0"
+    eslint-visitor-keys "^2.0.0"
+
 "@webassemblyjs/ast@1.9.0":
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.9.0.tgz#bd850604b4042459a5a41cd7d338cbed695ed964"
@@ -797,6 +866,11 @@ array-flatten@1.1.1:
   resolved "https://registry.yarnpkg.com/array-flatten/-/array-flatten-1.1.1.tgz#9a5f699051b1e7073328f2a008968b64ea2955d2"
   integrity sha1-ml9pkFGx5wczKPKgCJaLZOopVdI=
 
+array-union@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/array-union/-/array-union-2.1.0.tgz#b798420adbeb1de828d84acd8a2e23d3efe85e8d"
+  integrity sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==
+
 array-unique@^0.3.2:
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.3.2.tgz#a894b75d4bc4f6cd679ef3244a9fd8f46ae2d428"
@@ -1806,6 +1880,13 @@ diffie-hellman@^5.0.0:
     miller-rabin "^4.0.0"
     randombytes "^2.0.0"
 
+dir-glob@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/dir-glob/-/dir-glob-3.0.1.tgz#56dbf73d992a4a93ba1584f4534063fd2e41717f"
+  integrity sha512-WkrWp9GR4KXfKGYzOLmTuGVi1UWFfws377n9cc55/tb6DuqyF6pcQ5AbiHEshaDpY9v6oaSr2XCDidGmMwdzIA==
+  dependencies:
+    path-type "^4.0.0"
+
 doctrine@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-3.0.0.tgz#addebead72a6574db783639dc87a121773973961"
@@ -2044,6 +2125,11 @@ eslint-visitor-keys@^1.1.0, eslint-visitor-keys@^1.3.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.3.0.tgz#30ebd1ef7c2fdff01c3a4f151044af25fab0523e"
   integrity sha512-6J72N8UNa462wa/KFODt/PJ3IU60SDpC3QXC1Hjc1BXXpfL2C9R5+AU7jhe0F6GREqVMh4Juu+NY7xn+6dipUQ==
 
+eslint-visitor-keys@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-2.0.0.tgz#21fdc8fbcd9c795cc0321f0563702095751511a8"
+  integrity sha512-QudtT6av5WXels9WjIM7qz1XD1cWGvX4gGXvp/zBn9nXG02D0utdU3Em2m/QjTnrsk6bBjmCygl3rmj118msQQ==
+
 eslint@^7.8.1:
   version "7.8.1"
   resolved "https://registry.yarnpkg.com/eslint/-/eslint-7.8.1.tgz#e59de3573fb6a5be8ff526c791571646d124a8fa"
@@ -2270,6 +2356,18 @@ fast-deep-equal@^3.1.1:
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.1.tgz#545145077c501491e33b15ec408c294376e94ae4"
   integrity sha512-8UEa58QDLauDNfpbrX55Q9jrGHThw2ZMdOky5Gl1CDtVeJDPVrG4Jxx1N8jw2gkWaff5UUuX1KJd+9zGe2B+ZA==
 
+fast-glob@^3.1.1:
+  version "3.2.4"
+  resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-3.2.4.tgz#d20aefbf99579383e7f3cc66529158c9b98554d3"
+  integrity sha512-kr/Oo6PX51265qeuCYsyGypiO5uJFgBS0jksyG7FUeCyQzNwYnzrNIMR1NXfkZXsMYXYLRAHgISHBz8gQcxKHQ==
+  dependencies:
+    "@nodelib/fs.stat" "^2.0.2"
+    "@nodelib/fs.walk" "^1.2.3"
+    glob-parent "^5.1.0"
+    merge2 "^1.3.0"
+    micromatch "^4.0.2"
+    picomatch "^2.2.1"
+
 fast-json-stable-stringify@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz#874bf69c6f404c2b5d99c481341399fd55892633"
@@ -2285,6 +2383,13 @@ fast-safe-stringify@^2.0.4:
   resolved "https://registry.yarnpkg.com/fast-safe-stringify/-/fast-safe-stringify-2.0.7.tgz#124aa885899261f68aedb42a7c080de9da608743"
   integrity sha512-Utm6CdzT+6xsDk2m8S6uL8VHxNwI6Jub+e9NYTcAms28T84pTa25GJQV9j0CY0N1rM8hK4x6grpF2BQf+2qwVA==
 
+fastq@^1.6.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/fastq/-/fastq-1.8.0.tgz#550e1f9f59bbc65fe185cb6a9b4d95357107f481"
+  integrity sha512-SMIZoZdLh/fgofivvIkmknUXyPnvxRE3DhtZ5Me3Mrsk5gyPL42F0xr51TdRXskBxHfMp+07bcYzfsYEsSQA9Q==
+  dependencies:
+    reusify "^1.0.4"
+
 fd-slicer@~1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/fd-slicer/-/fd-slicer-1.1.0.tgz#25c7c89cb1f9077f8891bbe61d8f390eae256f1e"
@@ -2569,7 +2674,7 @@ glob-parent@^3.1.0:
     is-glob "^3.1.0"
     path-dirname "^1.0.0"
 
-glob-parent@^5.0.0, glob-parent@~5.1.0:
+glob-parent@^5.0.0, glob-parent@^5.1.0, glob-parent@~5.1.0:
   version "5.1.1"
   resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.1.tgz#b6c1ef417c4e5663ea498f1c45afac6916bbc229"
   integrity sha512-FnI+VGOpnlGHWZxthPGR+QhR78fuiK0sNLkHQv+bL9fQi57lNNdquIbna/WrfROrolq8GK5Ek6BiMwqL/voRYQ==
@@ -2648,6 +2753,18 @@ globals@^12.1.0:
   dependencies:
     type-fest "^0.8.1"
 
+globby@^11.0.1:
+  version "11.0.1"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-11.0.1.tgz#9a2bf107a068f3ffeabc49ad702c79ede8cfd357"
+  integrity sha512-iH9RmgwCmUJHi2z5o2l3eTtGBtXek1OYlHrbcxOYugyHLmAsZrPj43OtHThd62Buh/Vv6VyCBD2bdyWcGNQqoQ==
+  dependencies:
+    array-union "^2.1.0"
+    dir-glob "^3.0.1"
+    fast-glob "^3.1.1"
+    ignore "^5.1.4"
+    merge2 "^1.3.0"
+    slash "^3.0.0"
+
 graceful-fs@^4.1.11:
   version "4.2.4"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
@@ -2868,6 +2985,11 @@ ignore@^4.0.6:
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-4.0.6.tgz#750e3db5862087b4737ebac8207ffd1ef27b25fc"
   integrity sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==
 
+ignore@^5.1.4:
+  version "5.1.8"
+  resolved "https://registry.yarnpkg.com/ignore/-/ignore-5.1.8.tgz#f150a8b50a34289b33e22f5889abd4d8016f0e57"
+  integrity sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw==
+
 import-fresh@^3.0.0, import-fresh@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/import-fresh/-/import-fresh-3.2.1.tgz#633ff618506e793af5ac91bf48b72677e15cbe66"
@@ -3637,6 +3759,11 @@ merge-descriptors@1.0.1:
   resolved "https://registry.yarnpkg.com/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
   integrity sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E=
 
+merge2@^1.3.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.4.1.tgz#4368892f885e907455a6fd7dc55c0c9d404990ae"
+  integrity sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==
+
 methods@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
@@ -3661,7 +3788,7 @@ micromatch@^3.0.4, micromatch@^3.1.10, micromatch@^3.1.4:
     snapdragon "^0.8.1"
     to-regex "^3.0.2"
 
-micromatch@^4.0.0:
+micromatch@^4.0.0, micromatch@^4.0.2:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.2.tgz#4fcb0999bf9fbc2fcbdd212f6d629b9a56c39259"
   integrity sha512-y7FpHSbMUMoyPbYUSzO6PaZ6FyRnQOpHuKwbo1G+Knck95XVU4QAiKdGEnj5wwoS7PlOgthX/09u5iFJ+aYf5Q==
@@ -4270,6 +4397,11 @@ path-to-regexp@0.1.7:
   resolved "https://registry.yarnpkg.com/path-to-regexp/-/path-to-regexp-0.1.7.tgz#df604178005f522f15eb4490e7247a1bfaa67f8c"
   integrity sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=
 
+path-type@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
+  integrity sha512-gDKb8aZMDeD/tZWs9P6+q0J9Mwkdl6xMV8TjnGP3qJVJ06bdMgkbBlLU8IdfOsIsFz2BW1rNVT3XuNEl8zPAvw==
+
 pathval@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
@@ -4718,6 +4850,11 @@ ret@~0.1.10:
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
   integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
 
+reusify@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.0.4.tgz#90da382b1e126efc02146e90845a88db12925d76"
+  integrity sha512-U9nH88a3fc/ekCF1l0/UP1IosiuIjyTh7hBvXVMHYgVcfGvt897Xguj2UOLDeI5BG2m7/uwyaLVT6fbtCwTyzw==
+
 rimraf@2.6.3:
   version "2.6.3"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.3.tgz#b2d104fe0d8fb27cf9e0a1cda8262dd3833c6cab"
@@ -4747,6 +4884,11 @@ ripemd160@^2.0.0, ripemd160@^2.0.1:
     hash-base "^3.0.0"
     inherits "^2.0.1"
 
+run-parallel@^1.1.9:
+  version "1.1.9"
+  resolved "https://registry.yarnpkg.com/run-parallel/-/run-parallel-1.1.9.tgz#c9dd3a7cf9f4b2c4b6244e173a6ed866e61dd679"
+  integrity sha512-DEqnSRTDw/Tc3FXf49zedI638Z9onwUotBMiUFKmrO2sdFKIbXamXGQ3Axd4qgphxKB4kw/qP1w5kTxnfU1B9Q==
+
 run-queue@^1.0.0, run-queue@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/run-queue/-/run-queue-1.0.3.tgz#e848396f057d223f24386924618e25694161ec47"
@@ -4946,6 +5088,11 @@ simple-swizzle@^0.2.2:
   dependencies:
     is-arrayish "^0.3.1"
 
+slash@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"
+  integrity sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==
+
 slice-ansi@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-2.1.0.tgz#cacd7693461a637a5788d92a7dd4fba068e81636"