Update eslint config

Author: tshemsedinov

.eslintignore

@@ -0,0 +1 @@
+node_modules/

.eslintrc.json

@@ -0,0 +1,159 @@
+{
+  "env": {
+    "browser": true,
+    "es6": true,
+    "node": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaVersion": 2020
+  },
+  "globals": {
+    "BigInt": true
+  },
+  "rules": {
+    "indent": ["error", 2],
+    "linebreak-style": ["error", "unix"],
+    "quotes": ["error", "single"],
+    "semi": ["error", "always"],
+    "no-loop-func": ["error"],
+    "block-spacing": ["error", "always"],
+    "camelcase": ["error"],
+    "eqeqeq": ["error", "always"],
+    "strict": ["error", "global"],
+    "brace-style": [
+      "error",
+      "1tbs",
+      {
+        "allowSingleLine": true
+      }
+    ],
+    "comma-style": ["error", "last"],
+    "comma-spacing": [
+      "error",
+      {
+        "before": false,
+        "after": true
+      }
+    ],
+    "eol-last": ["error"],
+    "func-call-spacing": ["error", "never"],
+    "key-spacing": [
+      "error",
+      {
+        "beforeColon": false,
+        "afterColon": true,
+        "mode": "minimum"
+      }
+    ],
+    "keyword-spacing": [
+      "error",
+      {
+        "before": true,
+        "after": true,
+        "overrides": {
+          "function": {
+            "after": false
+          }
+        }
+      }
+    ],
+    "max-len": [
+      "error",
+      {
+        "code": 80,
+        "ignoreUrls": true
+      }
+    ],
+    "max-nested-callbacks": [
+      "error",
+      {
+        "max": 7
+      }
+    ],
+    "new-cap": [
+      "error",
+      {
+        "newIsCap": true,
+        "capIsNew": false,
+        "properties": true
+      }
+    ],
+    "new-parens": ["error"],
+    "no-lonely-if": ["error"],
+    "no-trailing-spaces": ["error"],
+    "no-unneeded-ternary": ["error"],
+    "no-whitespace-before-property": ["error"],
+    "object-curly-spacing": ["error", "always"],
+    "operator-assignment": ["error", "always"],
+    "operator-linebreak": ["error", "after"],
+    "semi-spacing": [
+      "error",
+      {
+        "before": false,
+        "after": true
+      }
+    ],
+    "space-before-blocks": ["error", "always"],
+    "space-before-function-paren": [
+      "error",
+      {
+        "anonymous": "never",
+        "named": "never",
+        "asyncArrow": "always"
+      }
+    ],
+    "space-in-parens": ["error", "never"],
+    "space-infix-ops": ["error"],
+    "space-unary-ops": [
+      "error",
+      {
+        "words": true,
+        "nonwords": false,
+        "overrides": {
+          "typeof": false
+        }
+      }
+    ],
+    "no-unreachable": ["error"],
+    "no-global-assign": ["error"],
+    "no-self-compare": ["error"],
+    "no-unmodified-loop-condition": ["error"],
+    "no-constant-condition": [
+      "error",
+      {
+        "checkLoops": false
+      }
+    ],
+    "no-console": ["off"],
+    "no-useless-concat": ["error"],
+    "no-useless-escape": ["error"],
+    "no-shadow-restricted-names": ["error"],
+    "no-use-before-define": [
+      "error",
+      {
+        "functions": false
+      }
+    ],
+    "arrow-parens": ["error", "as-needed"],
+    "arrow-body-style": ["error", "as-needed"],
+    "arrow-spacing": ["error"],
+    "no-confusing-arrow": [
+      "error",
+      {
+        "allowParens": true
+      }
+    ],
+    "no-useless-computed-key": ["error"],
+    "no-useless-rename": ["error"],
+    "no-var": ["error"],
+    "object-shorthand": ["error", "always"],
+    "prefer-arrow-callback": ["error"],
+    "prefer-const": ["error"],
+    "prefer-numeric-literals": ["error"],
+    "prefer-rest-params": ["error"],
+    "prefer-spread": ["error"],
+    "rest-spread-spacing": ["error", "never"],
+    "template-curly-spacing": ["error", "never"]
+  }
+}