Merge pull request #3059 from Tyriar/ts4

Upgrade to typescript 4

.eslintrc.json

@@ -40,7 +40,6 @@
         "readonly": "generic"
       }
     ],
-    "@typescript-eslint/class-name-casing": "warn",
     "@typescript-eslint/consistent-type-definitions": "warn",
     "@typescript-eslint/explicit-function-return-type": [
       "warn",
@@ -61,10 +60,6 @@
       "warn",
       2
     ],
-    "@typescript-eslint/interface-name-prefix": [
-      "warn",
-      "always"
-    ],
     "@typescript-eslint/member-delimiter-style": [
       "warn",
       {

package.json

@@ -46,11 +46,11 @@
     "@types/utf8": "^2.1.6",
     "@types/webpack": "^4.41.21",
     "@types/ws": "^7.2.6",
-    "@typescript-eslint/eslint-plugin": "^2.34.0",
-    "@typescript-eslint/parser": "^2.34.0",
+    "@typescript-eslint/eslint-plugin": "^3.10.1",
+    "@typescript-eslint/parser": "^3.10.1",
     "chai": "^4.2.0",
     "deep-equal": "^2.0.3",
-    "eslint": "^6.8.0",
+    "eslint": "^7.7.0",
     "express": "^4.17.1",
     "express-ws": "^4.0.0",
     "glob": "^7.0.5",
@@ -62,7 +62,7 @@
     "playwright-core": "^0.11.1",
     "source-map-loader": "^1.0.2",
     "ts-loader": "^8.0.3",
-    "typescript": "3.9",
+    "typescript": "4.0",
     "utf8": "^3.0.0",
     "webpack": "^4.44.1",
     "webpack-cli": "^3.3.12",