.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 9,
    "sourceType": "module",
    "ecmaFeatures": {
      "generators": false,
      "objectLiteralDuplicateProperties": false
    }
  },
  "rules": {
    "prettier/prettier": [
      "error",
      { "arrowParens": "always", "singleQuote": true, "trailingComma": "none" }
    ],
    "strict": "error",
    "accessor-pairs": "off",
    "array-callback-return": "error",
    "block-scoped-var": "error",
    "class-methods-use-this": [
      "error",
      {
        "exceptMethods": []
      }
    ],
    "complexity": ["off", 11],
    "consistent-return": "error",
    "curly": "off",
    "default-case": [
      "error",
      {
        "commentPattern": "^no default$"
      }
    ],
    "dot-location": "off",
    "dot-notation": [
      "error",
      {
        "allowKeywords": true
      }
    ],
    "eqeqeq": [
      "error",
      "always",
      {
        "null": "ignore"
      }
    ],
    "guard-for-in": "error",
    "no-alert": "warn",
    "no-caller": "error",
    "no-case-declarations": "error",
    "no-div-regex": "off",
    "no-else-return": "error",
    "no-empty-function": [
      "error",
      {
        "allow": ["arrowFunctions", "functions", "methods"]
      }
    ],
    "no-empty-pattern": "error",
    "no-eq-null": "off",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-label": "error",
    "no-fallthrough": "error",
    "no-floating-decimal": "off",
    "no-global-assign": [
      "error",
      {
        "exceptions": []
      }
    ],
    "no-implicit-coercion": [
      "off",
      {
        "boolean": false,
        "number": true,
        "string": true,
        "allow": []
      }
    ],
    "no-implicit-globals": "off",
    "no-implied-eval": "error",
    "no-invalid-this": "off",
    "no-iterator": "error",
    "no-labels": [
      "error",
      {
        "allowLoop": false,
        "allowSwitch": false
      }
    ],
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-magic-numbers": [
      "off",
      {
        "ignore": [],
        "ignoreArrayIndexes": true,
        "enforceConst": true,
        "detectObjects": false
      }
    ],
    "no-multi-spaces": "off",
    "no-multi-str": "error",
    "no-new-func": "error",
    "no-new-wrappers": "error",
    "no-new": "error",
    "no-octal-escape": "error",
    "no-octal": "error",
    "no-param-reassign": [
      "warn",
      {
        "props": true
      }
    ],
    "no-proto": "error",
    "no-redeclare": "error",
    "no-restricted-properties": [
      "error",
      {
        "object": "arguments",
        "property": "callee",
        "message": "arguments.callee is deprecated"
      },
      {
        "property": "__defineGetter__",
        "message": "Please use Object.defineProperty instead."
      },
      {
        "property": "__defineSetter__",
        "message": "Please use Object.defineProperty instead."
      },
      {
        "object": "Math",
        "property": "pow",
        "message": "Use the exponentiation operator (**) instead."
      }
    ],
    "no-return-assign": "error",
    "no-return-await": "error",
    "no-script-url": "error",
    "no-self-assign": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-throw-literal": "error",
    "no-unmodified-loop-condition": "off",
    "no-unused-expressions": [
      "error",
      {
        "allowShortCircuit": false,
        "allowTernary": false
      }
    ],
    "no-unused-labels": "error",
    "no-useless-call": "off",
    "no-useless-concat": "error",
    "no-useless-escape": "error",
    "no-useless-return": "error",
    "no-void": "error",
    "no-warning-comments": [
      "off",
      {
        "terms": ["todo", "fixme", "xxx"],
        "location": "start"
      }
    ],
    "no-with": "error",
    "prefer-promise-reject-errors": [
      "error",
      {
        "allowEmptyReject": true
      }
    ],
    "radix": "error",
    "require-await": "off",
    "vars-on-top": "error",
    "wrap-iife": "off",
    "yoda": "error",
    "arrow-body-style": [
      "error",
      "as-needed",
      {
        "requireReturnForObjectLiteral": true
      }
    ],
    "arrow-parens": "off",
    "arrow-spacing": "off",
    "constructor-super": "error",
    "generator-star-spacing": "off",
    "no-class-assign": "error",
    "no-confusing-arrow": "off",
    "no-const-assign": "error",
    "no-dupe-class-members": "error",
    "no-duplicate-imports": "off",
    "no-new-symbol": "error",
    "no-restricted-imports": "off",
    "no-this-before-super": "error",
    "no-useless-computed-key": "error",
    "no-useless-constructor": "error",
    "no-useless-rename": [
      "error",
      {
        "ignoreDestructuring": false,
        "ignoreImport": false,
        "ignoreExport": false
      }
    ],
    "no-var": "error",
    "object-shorthand": [
      "error",
      "always",
      {
        "ignoreConstructors": false,
        "avoidQuotes": true
      }
    ],
    "prefer-arrow-callback": [
      "warn",
      {
        "allowNamedFunctions": false,
        "allowUnboundThis": true
      }
    ],
    "prefer-const": [
      "error",
      {
        "destructuring": "any",
        "ignoreReadBeforeAssign": true
      }
    ],
    "prefer-destructuring": [
      "warn",
      {
        "array": true,
        "object": true
      },
      {
        "enforceForRenamedProperties": false
      }
    ],
    "prefer-numeric-literals": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "prefer-template": "error",
    "require-yield": "error",
    "rest-spread-spacing": "off",
    "sort-imports": [
      "off",
      {
        "ignoreCase": false,
        "ignoreMemberSort": false,
        "memberSyntaxSortOrder": ["none", "all", "multiple", "single"]
      }
    ],
    "symbol-description": "error",
    "template-curly-spacing": "off",
    "yield-star-spacing": "off",
    "import/no-unresolved": [
      "error",
      {
        "commonjs": true,
        "caseSensitive": true
      }
    ],
    "import/named": "off",
    "import/default": "off",
    "import/namespace": "off",
    "import/export": "error",
    "import/no-named-as-default": "error",
    "import/no-named-as-default-member": "error",
    "import/no-deprecated": "off",
    "import/no-extraneous-dependencies": [
      "error",
      {
        "devDependencies": [
          "test/**",
          "tests/**",
          "spec/**",
          "**/__tests__/**",
          "test.js",
          "test-*.js",
          "**/*.test.js",
          "**/rollup.config.js",
          "**/rollup.config.*.js",
          "**/rollup.config-*.js",
          "**/rollup.config.js"
        ],
        "optionalDependencies": false
      }
    ],
    "import/no-mutable-exports": "error",
    "import/no-commonjs": "off",
    "import/no-amd": "error",
    "import/no-nodejs-modules": "off",
    "import/first": ["error", "absolute-first"],
    "import/imports-first": "off",
    "import/no-duplicates": "error",
    "import/no-namespace": "error",
    "import/extensions": [
      "error",
      "always",
      {
        "js": "never",
        "jsx": "never"
      }
    ],
    "import/order": [
      "warn",
      {
        "groups": ["builtin", "external", "internal", "parent", "sibling", "index"],
        "newlines-between": "always-and-inside-groups"
      }
    ],
    "import/newline-after-import": "error",
    "import/prefer-default-export": "error",
    "import/no-restricted-paths": "off",
    "import/max-dependencies": [
      "off",
      {
        "max": 10
      }
    ],
    "import/no-absolute-path": "error",
    "import/no-dynamic-require": "warn",
    "import/no-internal-modules": [
      "off",
      {
        "allow": []
      }
    ],
    "import/unambiguous": "off",
    "import/no-unassigned-import": "off",
    "import/no-named-default": "error",
    "callback-return": "off",
    "global-require": "warn",
    "handle-callback-err": "off",
    "no-mixed-requires": ["off", false],
    "no-new-require": "error",
    "no-path-concat": "error",
    "no-process-env": "off",
    "no-process-exit": "off",
    "no-restricted-modules": "off",
    "no-sync": "off",
    "no-await-in-loop": "error",
    "no-cond-assign": ["error", "always"],
    "no-console": "warn",
    "no-constant-condition": "warn",
    "no-control-regex": "error",
    "no-debugger": "error",
    "no-dupe-args": "error",
    "no-dupe-keys": "error",
    "no-duplicate-case": "error",
    "no-empty-character-class": "error",
    "no-empty": "error",
    "no-ex-assign": "error",
    "no-extra-boolean-cast": "error",
    "no-extra-parens": "off",
    "no-extra-semi": "off",
    "no-func-assign": "error",
    "no-inner-declarations": "error",
    "no-invalid-regexp": "error",
    "no-irregular-whitespace": "error",
    "no-obj-calls": "error",
    "no-prototype-builtins": "error",
    "no-regex-spaces": "error",
    "no-sparse-arrays": "error",
    "no-template-curly-in-string": "error",
    "no-unexpected-multiline": "off",
    "no-unreachable": "error",
    "no-unsafe-finally": "error",
    "no-unsafe-negation": "error",
    "use-isnan": "error",
    "valid-jsdoc": "off",
    "valid-typeof": [
      "error",
      {
        "requireStringLiterals": true
      }
    ],
    "array-bracket-spacing": "off",
    "block-spacing": "off",
    "brace-style": "off",
    "camelcase": [
      "error",
      {
        "properties": "never"
      }
    ],
    "capitalized-comments": [
      "off",
      "never",
      {
        "line": {
          "ignorePattern": ".*",
          "ignoreInlineComments": true,
          "ignoreConsecutiveComments": true
        },
        "block": {
          "ignorePattern": ".*",
          "ignoreInlineComments": true,
          "ignoreConsecutiveComments": true
        }
      }
    ],
    "comma-dangle": ["error", "never"],
    "comma-spacing": "off",
    "comma-style": "off",
    "computed-property-spacing": "off",
    "consistent-this": "off",
    "eol-last": "off",
    "func-call-spacing": "off",
    "func-name-matching": [
      "off",
      "always",
      {
        "includeCommonJSModuleExports": false
      }
    ],
    "func-names": "warn",
    "func-style": "off",
    "id-blacklist": "off",
    "id-length": "off",
    "id-match": "off",
    "indent": "off",
    "jsx-quotes": "off",
    "key-spacing": "off",
    "keyword-spacing": "off",
    "line-comment-position": [
      "error",
      {
        "position": "above",
        "ignorePattern": "",
        "applyDefaultPatterns": true
      }
    ],
    "linebreak-style": ["error", "unix"],
    "lines-around-comment": "off",
    "lines-around-directive": [
      "error",
      {
        "before": "always",
        "after": "always"
      }
    ],
    "max-depth": ["off", 4],
    "max-len": "off",
    "max-lines": [
      "off",
      {
        "max": 300,
        "skipBlankLines": true,
        "skipComments": true
      }
    ],
    "max-nested-callbacks": "off",
    "max-params": ["off", 3],
    "max-statements-per-line": [
      "off",
      {
        "max": 1
      }
    ],
    "max-statements": ["off", 10],
    "multiline-ternary": "off",
    "new-cap": [
      "error",
      {
        "newIsCap": true,
        "newIsCapExceptions": [],
        "capIsNew": false,
        "capIsNewExceptions": ["Immutable.Map", "Immutable.Set", "Immutable.List"]
      }
    ],
    "new-parens": "off",
    "newline-after-var": "off",
    "newline-before-return": "off",
    "newline-per-chained-call": "off",
    "no-array-constructor": "error",
    "no-bitwise": "error",
    "no-continue": "error",
    "no-inline-comments": "off",
    "no-lonely-if": "error",
    "no-mixed-operators": "off",
    "no-mixed-spaces-and-tabs": "off",
    "no-multi-assign": ["error"],
    "no-multiple-empty-lines": "off",
    "no-negated-condition": "off",
    "no-nested-ternary": "off",
    "no-new-object": "error",
    "no-plusplus": [
      "error",
      {
        "allowForLoopAfterthoughts": true
      }
    ],
    "no-restricted-syntax": ["error", "LabeledStatement", "WithStatement"],
    "no-tabs": "off",
    "no-ternary": "off",
    "no-trailing-spaces": "off",
    "no-underscore-dangle": [
      "error",
      {
        "allow": ["__dirname"],
        "allowAfterThis": true
      }
    ],
    "no-unneeded-ternary": [
      "error",
      {
        "defaultAssignment": false
      }
    ],
    "no-whitespace-before-property": "off",
    "object-curly-newline": "off",
    "object-curly-spacing": "off",
    "object-property-newline": "off",
    "one-var-declaration-per-line": "off",
    "one-var": ["error", "never"],
    "operator-assignment": ["error", "always"],
    "operator-linebreak": "off",
    "padded-blocks": "off",
    "quote-props": "off",
    "quotes": "off",
    "require-jsdoc": "off",
    "semi-spacing": "off",
    "semi": "off",
    "sort-keys": [
      "off",
      "asc",
      {
        "caseSensitive": false,
        "natural": true
      }
    ],
    "sort-vars": "off",
    "space-before-blocks": "off",
    "space-before-function-paren": "off",
    "space-in-parens": "off",
    "space-infix-ops": "off",
    "space-unary-ops": "off",
    "spaced-comment": [
      "error",
      "always",
      {
        "line": {
          "exceptions": ["-", "+"],
          "markers": ["=", "!"]
        },
        "block": {
          "exceptions": ["-", "+"],
          "markers": ["=", "!"],
          "balanced": false
        }
      }
    ],
    "unicode-bom": "off",
    "wrap-regex": "off",
    "init-declarations": "off",
    "no-catch-shadow": "off",
    "no-delete-var": "error",
    "no-label-var": "error",
    "no-restricted-globals": "off",
    "no-shadow-restricted-names": "error",
    "no-shadow": "warn",
    "no-undef-init": "error",
    "no-undef": "error",
    "no-undefined": "warn",
    "no-unused-vars": [
      "error",
      {
        "vars": "local",
        "args": "after-used",
        "ignoreRestSiblings": true
      }
    ],
    "no-use-before-define": [
      "error",
      {
        "functions": false,
        "classes": true,
        "variables": true
      }
    ]
  },
  "env": {
    "es6": true,
    "node": true,
    "jest": true,
    "mocha": true
  },
  "plugins": ["import", "prettier"],
  "settings": {
    "import/resolver": {
      "node": {
        "extensions": [".js", ".json"]
      }
    },
    "import/extensions": [".js", ".jsx"],
    "import/core-modules": [],
    "import/ignore": ["node_modules", "\\.(coffee|scss|css|less|hbs|svg|json)$"]
  }
}