.eslintrc.json

{
  "env": {
    "browser": true,
    "es2021": true,
    "node": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:sonarjs/recommended"
  ],
  "plugins": [ "sonarjs" ],
  "root": true,
  "parserOptions": {
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  // https://eslint.org/docs/latest/rules/
  "rules": {
    // Possible Problems
    "array-callback-return": "error",
    "constructor-super": "error",
    "no-await-in-loop": "error",
    "no-constant-binary-expression": "error",
    "no-constructor-return": "error",
    "no-duplicate-imports": "error",
    "no-new-native-nonconstructor": "error",
    "no-promise-executor-return": "warn",
    "no-self-compare": "error",
    "no-template-curly-in-string": "error",
    "no-unmodified-loop-condition": "error",
    "no-unreachable-loop": "error",
    "no-unused-private-class-members": "error",
    // "no-use-before-define": [ "error", {
    //   "functions": false,
    //   "classes": false,
    //   "variables": false,
    //   "allowNamedExports": true
    // }],
    "require-atomic-updates": "error",


  
    // Layout & Formatting
    "array-bracket-newline": ["error", { "multiline": true, "minItems": 3 }],
    "array-bracket-spacing": [ "error", "always" ],
    "array-element-newline": ["error", { "multiline": true, "minItems": 3 }],
    "arrow-parens": "error",
    "arrow-spacing": ["error", { "before": true, "after": true }],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "stroustrup"],
    "comma-dangle": ["error", "never"],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-style": [ "error", "last" ],
    "computed-property-spacing": [ "error", "never" ],
    "dot-location": [ "error", "property" ],
    "eol-last": ["error", "always"],
    "func-call-spacing": [ "error", "never" ],
    "function-call-argument-newline": [ "error", "consistent" ],
    "function-paren-newline": [ "error", "consistent" ],
    "generator-star-spacing": ["error", {
      "before": false,
      "after": true,
      "anonymous": "neither",
      "method": {"before": true, "after": true}
    }],
    "implicit-arrow-linebreak": ["error", "beside"],
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "jsx-quotes": [ "error", "prefer-single" ],
    "key-spacing": [ "error", { "beforeColon": false, "afterColon": true } ],
    "keyword-spacing": [
      "error",
      { "before": true, "after": true }
    ],
    // "line-comment-position": ["error", { "position": "above" }],
    "linebreak-style": [ "error", "unix" ],
    "lines-between-class-members": ["error", "always"],
    "max-len": [ "error",  {
      "code": 120, // Default = 80
      "tabWidth": 2, // Default = 4
      "ignoreComments": true,
      "ignoreTrailingComments": false,
      "ignoreUrls": true,
      "ignoreStrings": true, // Default = 2 - Single and double only (NOT ` - use that instead for long strings)
      "ignoreTemplateLiterals": true,
      "ignoreRegExpLiterals": true
    }],
    "max-statements-per-line": ["error", { "max": 1 }],
    "multiline-ternary": ["error", "always-multiline"],
    "new-parens": "error",
    "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 2 }],
    // "no-extra-parens": ["always", "all", {
    //   "conditionalAssign": false,
    //   "returnAssignment": false,
    //   "nestedBinaryExpressions": false,
    //   "ignoreJSX": "multi-line",
    //   "enforceForArrowConditionals": false,
    //   "enforceForNewInMemberExpressions": false,
    //   "enforceForFunctionPrototypeMethods": false
    // }],
    "no-mixed-spaces-and-tabs": "error", // eslint:recommended
    "no-multi-spaces": "error",
    "no-multiple-empty-lines": "error",
    "no-tabs": "error",
    "no-trailing-spaces": "error",
    "no-whitespace-before-property": "error",
    "nonblock-statement-body-position": [
      "error",
      "beside",
      {
        "overrides": {
          "while": "below",
          "do": "any"
        }
      }
    ],
    "object-curly-newline": ["error", {
      "ObjectExpression": { "minProperties": 2 },
      "ObjectPattern": { "minProperties": 3 },
      "ImportDeclaration": "always",
      "ExportDeclaration": { "multiline": true, "minProperties": 3 }
    }],
    "object-curly-spacing": ["error", "always"],
    "object-property-newline": [
      "error",
      {
        "allowMultiplePropertiesPerLine": true
      }
    ],
    "operator-linebreak": ["error", "before"],
    "padded-blocks": ["error", "never"],
    // "padding-line-between-statements": [
    //   "error",
    //   { "blankLine": "always", "prev": ["const", "let", "var"], "next": "*"},
    //   { "blankLine": "any",    "prev": ["const", "let", "var"], "next": ["const", "let", "var"]},

    //   // Require newline before control flow statements
    //   { "blankLine": "always", "prev": "*", "next": ["continue", "break"] }
    // ],
    "quotes": ["error", "single"],
    "rest-spread-spacing": ["error", "never"],
    "semi": ["error", "always"],
    "semi-spacing": ["error", { "before": false, "after": true }],
    "semi-style": ["error", "last"],
    "space-before-blocks": [
      "error",
      {
        "functions": "always",
        "keywords": "always",
        "classes": "always"
      }
    ],
    "space-before-function-paren": [
      "error",
      "always"
    ],
    "space-in-parens": ["error", "never"],
    "space-infix-ops": ["error", { "int32Hint": false }],
    "space-unary-ops": [
      2, {
        "words": true, // typeof, void, etc
        "nonwords": false // ++, --, etc
    }],
    "switch-colon-spacing": ["error", {"after": true, "before": false}],
    "template-curly-spacing": ["error", "always"],
    "template-tag-spacing": ["error", "never"],
    "unicode-bom": ["error", "never"],
    "wrap-iife": ["error", "outside"],
    "wrap-regex": "error",
    "yield-star-spacing": ["error", {"before": false, "after": true}],



    // Suggestions
    "default-case": [
      "warn",
      {
        "commentPattern": "^no default$"
      }
    ],
    "eqeqeq": [
      "warn",
      "smart"
    ],
    "no-array-constructor": "warn",
    "no-caller": "warn",
    "no-cond-assign": [
      "warn",
      "except-parens"
    ],
    "no-const-assign": "warn",
    "no-control-regex": "warn",
    "no-delete-var": "warn",
    "no-dupe-args": "warn",
    "no-dupe-class-members": "warn",
    "no-dupe-keys": "warn",
    "no-duplicate-case": "warn",
    "no-empty-character-class": "warn",
    "no-empty-pattern": "warn",
    "no-eval": "warn",
    "no-ex-assign": "warn",
    "no-extend-native": "warn",
    "no-extra-bind": "warn",
    "no-extra-label": "warn",
    "no-fallthrough": "warn",
    "no-func-assign": "warn",
    "no-implied-eval": "warn",
    "no-invalid-regexp": "warn",
    "no-iterator": "warn",
    "no-label-var": "warn",
    "no-labels": [
      "warn",
      {
        "allowLoop": true,
        "allowSwitch": false
      }
    ],
    "no-lone-blocks": "warn",
    "no-loop-func": "warn",
    "no-magic-numbers": 0,
    "no-mixed-operators": [
      "warn",
      {
        "groups": [
          [
            "&",
            "|",
            "^",
            "~",
            "<<",
            ">>",
            ">>>"
          ],
          [
            "==",
            "!=",
            "===",
            "!==",
            ">",
            ">=",
            "<",
            "<="
          ],
          [
            "&&",
            "||"
          ],
          [
            "in",
            "instanceof"
          ]
        ],
        "allowSamePrecedence": false
      }
    ],
    "no-multi-str": "warn",
    "no-native-reassign": "warn",
    "no-negated-in-lhs": "warn",
    "no-new-func": "warn",
    "no-new-object": "warn",
    "no-new-symbol": "warn",
    "no-new-wrappers": "warn",
    "no-obj-calls": "warn",
    "no-octal": "warn",
    "no-octal-escape": "warn",
    "no-redeclare": [
      "warn",
      {
        "builtinGlobals": false
      }
    ],
    "no-regex-spaces": "warn",
    "no-restricted-syntax": [
      "warn",
      "WithStatement"
    ],
    "no-script-url": "warn",
    "no-self-assign": "warn",
    "no-sequences": "warn",
    "no-shadow-restricted-names": "warn",
    "no-sparse-arrays": "warn",
    "no-this-before-super": "warn",
    "no-throw-literal": "warn",
    "no-undef": "error",
    "no-unexpected-multiline": "warn",
    "no-unreachable": "warn",
    "no-unused-expressions": [
      "error",
      {
        "allowShortCircuit": true,
        "allowTernary": true,
        "allowTaggedTemplates": true
      }
    ],
    "no-unused-labels": "warn",
    "no-unused-vars": [
      "warn",
      {
        "args": "none",
        "ignoreRestSiblings": true
      }
    ],
    "no-useless-computed-key": "warn",
    "no-useless-concat": "warn",
    "no-useless-constructor": "warn",
    "no-useless-escape": "warn",
    "no-useless-rename": [
      "warn",
      {
        "ignoreDestructuring": false,
        "ignoreImport": false,
        "ignoreExport": false
      }
    ],
    "no-with": "warn",
    "require-yield": "warn",
    "strict": [
      "warn",
      "never"
    ],
    "use-isnan": "warn",
    "valid-typeof": "warn",
    "getter-return": "warn",
    "no-unneeded-ternary": "warn",
    "no-console": "off",
    "prefer-const": [
      "error",
      {
        "destructuring": "any",
        "ignoreReadBeforeAssign": true
      }
    ]
  }
}