eslintrc.json

{
  "extends": [
    "eslint:recommended"
  ],
  "rules": {
    "valid-jsdoc": [
      "warn",
      {
        "prefer": {
          "return": "returns",
          "arg": "param",
          "argument": "param",
          "class": "constructor"
        },
        "preferType": {
          "Boolean": "boolean",
          "Number": "number",
          "object": "Object",
          "String": "string"
        }
      }
    ],
    "complexity": [
      "warn",
      7
    ],
    "curly": "error",
    "dot-location": [
      "error",
      "object"
    ],
    "dot-notation": "error",
    "eqeqeq": "error",
    "no-else-return": "error",
    "no-empty-pattern": "error",
    "no-eval": "error",
    "no-extra-bind": "error",
    "no-extra-label": "error",
    "no-floating-decimal": "error",
    "no-implicit-coercion": "warn",
    "no-implicit-globals": "warn",
    "no-implied-eval": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "warn",
    "no-magic-numbers": [
      "error",
      {
        "ignoreArrayIndexes": true
      }
    ],
    "no-multi-spaces": [
      "error",
      {
        "exceptions": {
          "Property": true,
          "VariableDeclarator": true,
          "ImportDeclaration": true
        }
      }
    ],
    "no-new-func": "error",
    "no-new-wrappers": "error",
    "no-param-reassign": "warn",
    "no-return-assign": "error",
    "no-return-await": "error",
    "no-throw-literal": "error",
    "no-useless-call": "error",
    "no-with": "error",
    "prefer-promise-reject-errors": "error",
    "radix": "error",
    "vars-on-top": "error",
    "no-path-concat": "error",
    "block-spacing": "error",
    "camelcase": [
      "error",
      {
        "properties": "never"
      }
    ],
    "comma-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "comma-style": "error",
    "computed-property-spacing": "error",
    "eol-last": "error",
    "func-call-spacing": "error",
    "func-names": [
      "error",
      "as-needed"
    ],
    "func-style": [
      "error",
      "declaration",
      {
        "allowArrowFunctions": true
      }
    ],
    "indent": [
      "error",
      2
    ],
    "key-spacing": [
      "error",
      {
        "mode": "minimum"
      }
    ],
    "keyword-spacing": [
      "error"
    ],
    "linebreak-style": "error",
    "max-depth": "warn",
    "max-nested-callbacks": "warn",
    "max-params": "warn",
    "max-statements": [
      "warn",
      {
        "max": 20
      }
    ],
    "new-cap": "warn",
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "error",
    "no-whitespace-before-property": "error",
    "object-curly-spacing": [
      "error",
      "always"
    ],
    "quote-props": [
      "error",
      "as-needed",
      {
        "keywords": true,
        "numbers": true
      }
    ],
    "quotes": [
      "error",
      "single",
      {
        "avoidEscape": true
      }
    ],
    "semi": "error",
    "semi-spacing": "error",
    "space-before-blocks": "error",
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "always",
        "named": "never"
      }
    ],
    "space-in-parens": ["error", "never"],
    "unicode-bom": "error",
    "arrow-body-style": [
      "error",
      "as-needed"
    ],
    "arrow-parens": [
      "error",
      "as-needed"
    ],
    "no-confusing-arrow": "warn",
    "no-duplicate-imports": "error",
    "object-shorthand": [
      "error",
      "always",
      {
        "avoidQuotes": true,
        "avoidExplicitReturnArrows": true
      }
    ],
    "prefer-const": [
      "warn",
      {
        "destructuring": "all"
      }
    ],
    "template-curly-spacing": "error"
  }
}

eslintrc.yaml

---
extends:
  - eslint:recommended
rules:
  # Possible Errors - most of these come from eslint:recommended
  valid-jsdoc:
    - warn
    - prefer:
        return: returns
        arg: param
        argument: param
        class: constructor
      preferType:
        Boolean: boolean
        Number: number
        object: Object
        String: string
  # Best Practices
  complexity:
    - warn
    - 7
  curly: error
  dot-location:
    - error
    - object
  dot-notation: error
  eqeqeq: error
  no-else-return: error
  no-empty-pattern: error
  no-eval: error
  no-extra-bind: error
  no-extra-label: error
  no-floating-decimal: error
  no-implicit-coercion: warn
  no-implicit-globals: warn
  no-implied-eval: error
  no-lone-blocks: error
  no-loop-func: warn
  no-magic-numbers:
    - error
    - ignoreArrayIndexes: true
  no-multi-spaces:
    - error
    - exceptions:
        Property: true
        VariableDeclarator: true
        ImportDeclaration: true
  no-new-func: error
  no-new-wrappers: error
  no-param-reassign: warn
  no-return-assign: error
  no-return-await: error
  no-throw-literal: error
  no-useless-call: error
  no-with: error
  prefer-promise-reject-errors: error
  radix: error
  vars-on-top: error
  # Variables - TODO
  # Node.js and CommonJS
  no-path-concat: error
  # Stylistic Issues
  block-spacing: error
  camelcase:
    - error
    - properties: never
  comma-spacing:
    - error
    - before: false
      after: true
  comma-style: error
  computed-property-spacing: error
  eol-last: error
  func-call-spacing: error
  func-names:
    - error
    - as-needed
  func-style:
    - error
    - declaration
    - allowArrowFunctions: true
  indent:
    - error
    - 2
  key-spacing:
    - error
    - mode: minimum
  keyword-spacing:
    - error
  linebreak-style: error
  max-depth: warn
  max-nested-callbacks: warn
  max-params: warn
  max-statements:
    - warn
      max: 20
  new-cap: warn
  new-parens: error
  no-array-constructor: error
  no-trailing-spaces: error
  no-unneeded-ternary: error
  no-whitespace-before-property: error
  object-curly-spacing:
    - error
    - always
  quote-props:
    - error
    - as-needed
    - keywords: true
      numbers: true
  quotes:
    - error
    - single
    - avoidEscape: true
  semi: error
  semi-spacing: error
  space-before-blocks: error
  space-before-function-paren:
    - error
    - anonymous: always
      named: never
  space-in-parens:
    - error
    - never
  unicode-bom: error
  # ECMAScript 6
  arrow-body-style:
    - error
    - as-needed
  arrow-parens:
    - error
    - as-needed
  no-confusing-arrow: warn
  no-duplicate-imports: error
  object-shorthand:
    - error
    - always
    - avoidQuotes: true
      avoidExplicitReturnArrows: true
  prefer-const:
    - warn
    - destructuring: all
  template-curly-spacing: error