u target

.eslintrc.json

@@ -1,14 +1,10 @@
 {
   "env": {
-    "es6": true,
     "node": true,
     "mocha": true,
     "browser": true
   },
-  "extends": [
-    "plugin:@typescript-eslint/recommended",
-    "eslint:recommended"
-  ],
+  "extends": ["plugin:@typescript-eslint/recommended", "eslint:recommended"],
   "parser": "@typescript-eslint/parser",
   "parserOptions": {
     "project": "./tsconfig.json",
@@ -19,7 +15,7 @@
     "@typescript-eslint/no-explicit-any": "off",
     "no-redeclare": "off",
     "no-unused-vars": "off",
-    "prefer-const": ["error", {"destructuring": "all"}],
+    "prefer-const": ["error", { "destructuring": "all" }],
     "semi": ["error", "never"],
     "no-extra-semi": "off",
     "@typescript-eslint/no-extra-semi": "off"

tsconfig.json

@@ -7,7 +7,7 @@
     "strict": true,
     "sourceMap": true,
     "forceConsistentCasingInFileNames": true,
-    "target": "es6",
+    "target": "ESNext",
     "module": "ESNext",
     "moduleResolution": "node"
   }