.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  "env": {
    "es6": true,
    "node": true,
    "browser": true,
    "jest": true
  },
  "globals": {
    "globalThis": true
  },
  "plugins": [],
  "overrides": [],
  "extends": ["eslint:recommended"],
  "rules": {
    "arrow-spacing": ["error", { "before": true, "after": true }],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": ["error", {
      "allow": ["^UNSAFE_"],
      "properties": "never",
      "ignoreGlobals": true
    }],
    "comma-dangle": ["error", {
      "arrays": "always-multiline",
      "objects": "always-multiline",
      "imports": "never",
      "exports": "never",
      "functions": "never"
    }],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "eol-last": "error",
    "eqeqeq": ["error", "always", { "null": "ignore" }],
    "func-call-spacing": ["error", "never"],
    "indent": [
      "error",
      2,
      {
        "MemberExpression": 1,
        "FunctionDeclaration": {
          "body": 1,
          "parameters": 2
        },
        "SwitchCase": 1
      }
    ],
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
    "keyword-spacing": ["error", { "before": true, "after": true }],
    "lines-between-class-members": ["error", "always", { "exceptAfterSingleLine": true }],
    "max-len": [
      "error",
      {
        "code": 120,
        "ignoreTrailingComments": true,
        "ignoreComments": true,
        "ignoreUrls": true
      }
    ],
    "max-lines": [
      "error",
      {
        "max": 360,
        "skipBlankLines": true,
        "skipComments": false
      }
    ],
    "max-lines-per-function": [
      "error",
      {
        "max": 150,
        "skipBlankLines": true
      }
    ],
    "max-params": ["error", 3],
    "no-array-constructor": "error",
    "no-mixed-spaces-and-tabs": "error",
    "no-multi-spaces": "error",
    "no-multi-str": "error",
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1,
        "maxEOF": 0
      }
    ],
    "no-restricted-syntax": [
        "error",
        "WithStatement",
        "BinaryExpression[operator='in']"
    ],
    "no-trailing-spaces": "error",
    "no-use-before-define": [
      "error",
      {
        "functions": true,
        "classes": true,
        "variables": false
      }
    ],
    "no-var": "warn",
    "object-curly-spacing": ["error", "always"],
    "padded-blocks": [
      "error",
      {
        "blocks": "never",
        "switches": "never",
        "classes": "never"
      }
    ],
    "quotes": ["error", "single"],
    "space-before-blocks": ["error", "always"],
    "space-before-function-paren": ["error", "always"],
    "space-infix-ops": "error",
    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
    "space-in-parens": ["error", "never"],
    "semi": ["error", "never"]
  }
}