ESLint Configs

.eslintrc

{
  "env": {
    "node": true,
    "es6": true
  },
  "extends": [
    "eslint:recommended"
  ],
  "parserOptions": {
    "sourceType": "module",
    "ecmaFeatures": {
      "modules": true
    },
    "ecmaVersion": 2017
  },
  "rules": {
    "array-bracket-spacing": 2,
    "arrow-parens": 2,
    "arrow-spacing": 2,
    "brace-style": 2,
    "block-spacing": 2,
    "comma-spacing": 2,
    "comma-style": 2,
    "computed-property-spacing": 2,
    "curly": [2, "all"],
    "eqeqeq": 2,
    "func-call-spacing": 2,
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "key-spacing": 2,
    "keyword-spacing": 2,
    "max-statements-per-line": 2,
    "newline-after-var": 2,
    "newline-before-return": 2,
    "no-alert": 2,
    "no-array-constructor": 2,
    "no-mixed-spaces-and-tabs": 2,
    "no-multi-spaces": ["error", {
      "exceptions": {
        "VariableDeclarator": true
      }
    }],
    "no-multiple-empty-lines": ["error", { "max": 1 }],
    "no-new-object": 2,
    "no-return-assign": 2,
    "no-unneeded-ternary": 2,
    "no-unused-vars": 1,
    "no-var": 1,
    "no-whitespace-before-property": 2,
    "object-curly-spacing": [2, "always"],
    "object-shorthand": [2, "always"],
    "one-var": [2, "never"],
    "padded-blocks": ["error", {
      "blocks": "never",
      "classes": "never",
      "switches": "never"
    }],
    "prefer-arrow-callback": 1,
    "prefer-const": 2,
    "prefer-spread": 1,
    "prefer-template": 2,
    "quote-props": [2, "as-needed"],
    "quotes": [2, "single"],
    "semi": 2,
    "space-before-blocks": 2,
    "space-before-function-paren": 2,
    "space-in-parens": 2,
    "space-infix-ops": 2,
    "space-unary-ops": 2,
    "spaced-comment": 2
  }
}

.eslintrc.yaml.browser

---
env:
  browser: true
  es6: true
  node: true
extends:
  - eslint:recommended
  - plugin:react/recommended
parserOptions:
  sourceType: module
  ecmaFeatures:
    modules: true
    jsx: true
  ecmaVersion: 2017
rules:
  react/prop-types: warn
  array-bracket-spacing: error
  arrow-parens: error
  arrow-spacing: error
  brace-style: error
  block-spacing: error
  comma-spacing: error
  comma-style: error
  computed-property-spacing: error
  curly:
    - error
    - all
  eqeqeq: error
  func-call-spacing: error
  indent:
    - error
    - 2
    - SwitchCase: 1
  key-spacing: error
  keyword-spacing: error
  max-statements-per-line: error
  newline-after-var: error
  newline-before-return: error
  no-alert: error
  no-array-constructor: error
  no-mixed-spaces-and-tabs: error
  no-multi-spaces:
    - error
    - exceptions:
        VariableDeclarator: true
  no-multiple-empty-lines:
    - error
    - max: 1
  no-new-object: error
  no-return-assign: error
  no-unneeded-ternary: error
  no-unused-vars: warn
  no-var: error
  no-whitespace-before-property: error
  object-curly-spacing:
    - error
    - always
  object-shorthand:
    - error
    - always
  one-var:
    - error
    - never
  padded-blocks:
    - error
    - blocks: never
      classes: never
      switches: never
  prefer-arrow-callback: warn
  prefer-const: error
  prefer-spread: warn
  prefer-template: error
  quote-props:
    - error
    - as-needed
  quotes:
    - error
    - single
  semi: error
  space-before-blocks: error
  space-before-function-paren: error
  space-in-parens: error
  space-infix-ops: error
  space-unary-ops: error
  spaced-comment: error

.eslintrc.yaml.node

---
env:
  es6: true
  node: true
extends:
  - eslint:recommended
parserOptions:
  sourceType: module
  ecmaFeatures:
    modules: true
  ecmaVersion: 2017
rules:
  array-bracket-spacing: error
  arrow-parens: error
  arrow-spacing: error
  brace-style: error
  block-spacing: error
  comma-spacing: error
  comma-style: error
  computed-property-spacing: error
  curly:
    - error
    - all
  eqeqeq: error
  func-call-spacing: error
  indent:
    - error
    - 2
    - SwitchCase: 1
  key-spacing: error
  keyword-spacing: error
  max-statements-per-line: error
  newline-after-var: error
  newline-before-return: error
  no-alert: error
  no-array-constructor: error
  no-mixed-spaces-and-tabs: error
  no-multi-spaces:
    - error
    - exceptions:
        VariableDeclarator: true
  no-multiple-empty-lines:
    - error
    - max: 1
  no-new-object: error
  no-return-assign: error
  no-unneeded-ternary: error
  no-unused-vars: warn
  no-var: error
  no-whitespace-before-property: error
  object-curly-spacing:
    - error
    - always
  object-shorthand:
    - error
    - always
  one-var:
    - error
    - never
  padded-blocks:
    - error
    - blocks: never
      classes: never
      switches: never
  prefer-arrow-callback: warn
  prefer-const: error
  prefer-spread: warn
  prefer-template: error
  quote-props:
    - error
    - as-needed
  quotes:
    - error
    - single
  semi: error
  space-before-blocks: error
  space-before-function-paren: error
  space-in-parens: error
  space-infix-ops: error
  space-unary-ops: error
  spaced-comment: error