.eslintrc

{
  "env": {
    "node": true,
    "es6": true,
    "mocha": true
  },
  "parserOptions": {
    "ecmaVersion": 2020,
    "ecmaFeatures": {
      "globalReturn": true,
      "experimentalObjectRestSpread": true
    }
  },
  "rules": {
    "array-element-newline": ["off", { "multiline": true, "minItems": 3 }],
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": ["error", { "properties": "never" }],
    "capitalized-comments": ["off", "never", {
      "line": {
        "ignorePattern": ".*",
        "ignoreInlineComments": true,
        "ignoreConsecutiveComments": true
      },
      "block": {
        "ignorePattern": ".*",
        "ignoreInlineComments": true,
        "ignoreConsecutiveComments": true
      }
    }],
    "comma-dangle": ["error", {
      "arrays": "always-multiline",
      "objects": "never",
      "imports": "never",
      "exports": "never",
      "functions": "never"
    }],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-style": ["error", "last", {
      "exceptions": {
        "ArrayExpression": false,
        "ArrayPattern": false,
        "ArrowFunctionExpression": false,
        "CallExpression": false,
        "FunctionDeclaration": false,
        "FunctionExpression": false,
        "ImportDeclaration": false,
        "ObjectExpression": false,
        "ObjectPattern": false,
        "VariableDeclaration": false,
        "NewExpression": false
      }
    }],
    "computed-property-spacing": ["error", "never"],
    "consistent-this": "off",
    "eol-last": ["error", "always"],
    "func-call-spacing": ["error", "never"],
    "func-name-matching": ["off", "always", {
      "includeCommonJSModuleExports": false
    }],
    "func-names": ["off"],
    "func-style": ["off", "expression"],
    "function-paren-newline": ["error", "multiline"],
    "id-blacklist": "off",
    "id-length": "off",
    "id-match": "off",
    "implicit-arrow-linebreak": ["error", "beside"],
    "arrow-parens": [2, "as-needed", { "requireForBlockBody": true }],
    "indent": ["error", 2, {
      "SwitchCase": 1,
      "VariableDeclarator": 1,
      "outerIIFEBody": 1,
      "FunctionDeclaration": {
        "parameters": 1,
        "body": 1
      },
      "FunctionExpression": {
        "parameters": 1,
        "body": 1
      },
      "CallExpression": {
        "arguments": 1
      },
      "ArrayExpression": 1,
      "ObjectExpression": 1,
      "ImportDeclaration": 1,
      "flatTernaryExpressions": false,
      "ignoredNodes": ["JSXElement", "JSXElement > *", "JSXAttribute", "JSXIdentifier", "JSXNamespacedName", "JSXMemberExpression", "JSXSpreadAttribute", "JSXExpressionContainer", "JSXOpeningElement", "JSXClosingElement", "JSXText", "JSXEmptyExpression", "JSXSpreadChild"],
      "ignoreComments": false
    }],
    "jsx-quotes": ["off", "prefer-double"],
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true, "mode": "minimum" }],
    "keyword-spacing": ["error", {
      "before": true,
      "after": true,
      "overrides": {
        "return": { "after": true },
        "throw": { "after": true },
        "case": { "after": true }
      }
    }],
    "line-comment-position": ["off", {
      "position": "above",
      "ignorePattern": "",
      "applyDefaultPatterns": true
    }],
    "linebreak-style": ["error", "unix"],
    "lines-between-class-members": ["error", "always", { "exceptAfterSingleLine": false }],
    "lines-around-comment": "off",
    "lines-around-directive": ["error", {
      "before": "always",
      "after": "always"
    }],
    "max-depth": ["off", 4],
    "max-len": ["error", 240, 2, {
      "ignoreUrls": true,
      "ignoreComments": false,
      "ignoreRegExpLiterals": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true
    }],
    "max-lines": ["off", {
      "max": 300,
      "skipBlankLines": true,
      "skipComments": true
    }],
    "callback-return": ["error", ["callback", "done", "next", "resolve", "reject"]],
    "max-nested-callbacks": "off",
    "max-params": ["off", 3],
    "max-statements": ["off", 10],
    "max-statements-per-line": ["off", { "max": 1 }],
    "multiline-comment-style": ["off", "starred-block"],
    "multiline-ternary": ["error", "never"],
    "new-cap": ["error", {
      "newIsCap": true,
      "newIsCapExceptions": ["Storage.model"],
      "capIsNew": false,
      "capIsNewExceptions": ["Immutable.Map", "Immutable.Set", "Immutable.List"]
    }],
    "new-parens": "error",
    "newline-after-var": "off",
    "newline-before-return": "off",
    "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 4 }],
    "no-array-constructor": "error",
    "no-bitwise": "off",
    "no-console": "error",
    "no-continue": "off",
    "no-inline-comments": "off",
    "no-lonely-if": "error",
    "no-mixed-operators": ["error", {
      "groups": [
        ["%", "**"],
        ["%", "+"],
        ["%", "-"],
        ["%", "*"],
        ["%", "/"],
        ["**", "+"],
        ["**", "-"],
        ["**", "*"],
        ["**", "/"],
        ["&", "|", "^", "~", "<<", ">>", ">>>"],
        ["==", "!=", "===", "!==", ">", ">=", "<", "<="],
        ["&&", "||"],
        ["in", "instanceof"]
      ],
      "allowSamePrecedence": false
    }],
    "no-mixed-spaces-and-tabs": "error",
    "no-multi-assign": ["error"],
    "no-multiple-empty-lines": ["error", { "max": 2, "maxEOF": 1 }],
    "no-negated-condition": "off",
    "no-nested-ternary": "error",
    "no-new-object": "error",
    "no-plusplus": "off",
    "no-restricted-syntax": [
      "error",
      {
        "selector": "LabeledStatement",
        "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
      },
      {
        "selector": "WithStatement",
        "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
      }
    ],
    "no-spaced-func": "error",
    "no-tabs": "error",
    "no-ternary": "off",
    "no-trailing-spaces": ["error", {
      "skipBlankLines": false,
      "ignoreComments": false
    }],
    "no-undef": ["error"],
    "no-underscore-dangle": ["off"],
    "no-unused-vars": ["error", {
      "varsIgnorePattern": "should",
      "argsIgnorePattern": ".*",
      "ignoreRestSiblings": true
    }],
    "no-unneeded-ternary": ["error", { "defaultAssignment": false }],
    "no-whitespace-before-property": "error",
    "nonblock-statement-body-position": ["error", "beside", { "overrides": {} }],
    "curly": "error",
    "object-curly-spacing": ["error", "always"],
    "object-curly-newline": ["error", {
      "ObjectExpression": { "minProperties": 10, "multiline": true, "consistent": true },
      "ObjectPattern": { "minProperties": 10, "multiline": true, "consistent": true }
    }],
    "object-property-newline": ["error", {
      "allowAllPropertiesOnSameLine": true
    }],
    "one-var": ["error", "never"],
    "one-var-declaration-per-line": ["off", "always"],
    "operator-linebreak": ["error", "after", { "overrides": { "=": "none" } }],
    "padded-blocks": ["error", { "blocks": "never", "classes": "never", "switches": "never" }],
    "padding-line-between-statements": "off",
    "quote-props": ["error", "as-needed", { "keywords": false, "unnecessary": true, "numbers": false }],
    "quotes": ["error", "single", { "avoidEscape": true }],
    "require-jsdoc": "off",
    "semi": ["error", "always"],
    "semi-spacing": ["error", { "before": false, "after": true }],
    "semi-style": ["error", "last"],
    "sort-keys": ["off", "asc", { "caseSensitive": false, "natural": true }],
    "sort-vars": "off",
    "space-before-blocks": "error",
    "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": {
      }
    }],
    "spaced-comment": ["error", "always", {
      "line": {
        "exceptions": ["-", "+"],
        "markers": ["=", "!"]
      },
      "block": {
        "exceptions": ["-", "+"],
        "markers": ["=", "!"],
        "balanced": true
      }
    }],
    "switch-colon-spacing": ["error", { "after": true, "before": false }],
    "no-template-curly-in-string": "error",
    "template-tag-spacing": ["error", "never"],
    "unicode-bom": ["error", "never"],
    "wrap-regex": "off"
  }
}