.eslintrc

{
  "env": {
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 6,
    "ecmaFeatures": {
      "impliedStrict": true
    }
  },
  "plugins": [
    "jsdoc",
    "security"
  ],
  "root": true,
  "extends": "eslint:recommended",
  "rules": {
    //possible errors
    "no-console": "off",

    //best practices
    "array-callback-return": "error",
    "block-scoped-var": "error",
    "complexity": ["error", 10],
    "consistent-return": "error",
    "curly": ["error", "all"],
    "default-case": "error",
    "dot-notation": "error",
    "dot-location": ["error", "property"],
    "eqeqeq": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-eq-null": "error",
    "no-extra-bind": "warn",
    "no-floating-decimal": "warn",
    "no-implicit-coercion": "error",
    "no-magic-numbers": ["error", {
      "ignoreArrayIndexes": true,
      "enforceConst": true,
      "detectObjects": true
    }],
    "no-multi-spaces": ["error", {
      "exceptions": {
        "Property": true
      }
    }],
    "no-new": "error",
    "no-param-reassign": "error",
    "no-return-assign": "error",
    "no-cond-assign": ["error", "always"],
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": "error",
    "no-useless-call": "warn",
    "no-useless-concat": "warn",
    "no-useless-escape": "warn",
    "prefer-promise-reject-errors": "error",
    "require-await": "error",
    "wrap-iife": "error",

    //documentation
    "require-jsdoc": [ "error", {
      "require": {
        "FunctionDeclaration": true,
        "MethodDefinition": true,
        "ClassDeclaration": true,
        "ArrowFunctionExpression": false
      }
    }],
    "valid-jsdoc": [ "error", {
      "requireReturn": false,
      "requireReturnType": true,
      "matchDescription": ".+",
      "requireParamDescription": true,
      "requireReturnDescription": false,
      "preferType": {
        "boolean": "Boolean",
        "number": "Number",
        "object": "Object",
        "string": "String",
        "array": "Array",
        "regexp": "RegExp",
        "function": "Function"
      }
    }],

    //variables
    "init-declarations": ["error", "always"],
    "no-catch-shadow": "error",
    "no-shadow-restricted-names": "error",
    "no-undef-init": "error",
    "no-use-before-define": "error",

    //nodejs
    "callback-return": "error",
    "handle-callback-err": "error",
    "no-mixed-requires": "error",
    "no-new-require": "error",
    "no-path-concat": "error",
    "no-sync": "error",

    //stylistic
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": "error",
    "comma-dangle": ["error", "never"],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-style": ["error", "last"],
    "computed-property-spacing": ["error", "never"],
    "consistent-this": ["error", "self"],
    "eol-last": ["error", "always"],
    "func-call-spacing": ["error", "never"],
    "func-names": ["error", "always"],
    "func-style": ["error", "declaration"],
    "indent": ["error", 2, {
      "FunctionDeclaration": {
        "body": 1,
        "parameters": "first"
      },
      "MemberExpression": 1,
      "CallExpression": {
        "arguments": "first"
      },
      "ArrayExpression": 1,
      "ObjectExpression": 1
    }],
    "key-spacing": ["error", {
      "align": "value",
      "beforeColon": false,
      "afterColon": true,
      "mode": "strict"
    }],
    "keyword-spacing": "error",
    "linebreak-style": ["error", "unix"],
    "lines-around-comment": ["error", {
      "beforeBlockComment": true,
      "beforeLineComment": true,
      "allowBlockStart": true,
      "allowObjectStart": true,
      "allowArrayStart": true
    }],
    "lines-around-directive": ["error", "always"],
    "max-depth": ["error", 4],
    "max-len": ["error", {
      "code": 100,
      "ignoreUrls": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true,
      "ignoreRegExpLiterals": true,
      "ignoreComments": true,
      "ignoreTrailingComments": true
    }],
    "max-lines": ["error", {
      "max": 300,
      "skipBlankLines": true,
      "skipComments": true
    }],
    "max-nested-callbacks": ["error", 5],
    "max-params": ["error", 5],
    "max-statements-per-line": ["error", { "max": 1 }],
    "new-cap": "error",
    "new-parens": "error",
    "newline-after-var": ["error", "always"],
    "newline-before-return": "error",
    "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 2 }],
    "no-lonely-if": "error",
    "no-mixed-operators": "error",
    "no-multi-assign": "error",
    "no-multiple-empty-lines": ["error", {
      "max": 2
    }],
    "no-tabs": "error",
    "no-trailing-spaces": "error",
    "no-underscore-dangle": "error",
    "no-unneeded-ternary": "error",
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "never", {
      "objectsInObjects": true
    }],
    "object-property-newline": "error",
    "one-var": ["error", "never"],
    "operator-linebreak": ["error", "after"],
    "padded-blocks": ["error", "never"],
    "quotes": ["error", "double"],
    "semi": ["error", "always"],
    "semi-spacing": "error",
    "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",
    "unicode-bom": ["error", "never"],

    //ECMAScript 6
    "arrow-body-style": ["error", "always"],
    "arrow-parens": ["error", "always"],
    "arrow-spacing": "error",
    "generator-star-spacing": "error",
    "no-duplicate-imports": "error",
    "no-useless-computed-key": "error",
    "no-useless-rename": "error",
    "no-var": "error",
    "prefer-const": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "prefer-template": "error",
    "symbol-description": "error",
    "yield-star-spacing": "error",

    //Security related
    "security/detect-unsafe-regex": "error",
    "security/detect-buffer-noassert": "error",
    "security/detect-child-process": "error",
    "security/detect-disable-mustache-escape": "error",
    "security/detect-eval-with-expression": "error",
    "security/detect-no-csrf-before-method-override": "error",
    "security/detect-non-literal-fs-filename": "error",
    "security/detect-non-literal-regexp": "error",
    "security/detect-non-literal-require": "error",
    "security/detect-possible-timing-attacks": "error",
    "security/detect-pseudoRandomBytes": "warn"
  }
}