ESLint

.eslintrc.json

{
  "extends": "standard",
  "parser": "babel-eslint",
  "parserOptions": {
    "sourceType": "module",
    "allowImportExportEverywhere": false
  },
  "env": {
    "browser": true,
    "node": true,
    "es6": true,
    "jest/globals": true
  },
  "plugins": [
    "react",
    "jest"
  ],
  "rules": {

    "comma-dangle": ["error", "always-multiline"],
    "generator-star-spacing": ["error", {
      "before": false,
      "after": true,
      "anonymous": "after",
      "method": { "before": false, "after": false }
    }],
    "no-extra-parens": ["error", "all", {
      "conditionalAssign": false,
      "returnAssign": false,
      "nestedBinaryExpressions": false,
      "ignoreJSX": "all",
      "enforceForArrowConditionals": false
    }],
    "object-curly-newline": "off",
    "padded-blocks": "off",
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "never",
      "asyncArrow": "always"
    }],
    "wrap-iife": ["error", "inside", { "functionPrototypeMethods": true }],
    "yield-star-spacing": ["error", "after"],
    "standard/array-bracket-even-spacing": "off",
    "standard/computed-property-even-spacing": "off",
    "standard/object-curly-even-spacing": "off",

    "array-bracket-spacing": ["error", "never"],
    "computed-property-spacing": ["error", "never"],
    "guard-for-in": "error",
    "jsx-quotes": ["error", "prefer-double"],
    "linebreak-style": "error",
    "no-var": "error",
    "no-void": "error",
    "object-curly-spacing": ["error", "always"],
    "prefer-arrow-callback": "error",
    "prefer-const": "error",
    "prefer-destructuring": ["error", { "array": false }],
    "prefer-numeric-literals": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",

    "react/jsx-closing-bracket-location": "error",
    "react/jsx-closing-tag-location": "error",
    "react/jsx-curly-spacing": ["error", { "when": "never" }],
    "react/jsx-equals-spacing": ["error", "never"],
    "react/jsx-first-prop-new-line": ["error", "multiline"],
    "react/jsx-indent": ["error", 2],
    "react/jsx-indent-props": ["error", 2],
    "react/jsx-no-comment-textnodes": "error",
    "react/jsx-no-duplicate-props": "error",
    "react/jsx-no-target-blank": "error",
    "react/jsx-no-undef": "error",
    "react/jsx-pascal-case": "error",
    "react/jsx-tag-spacing": "error",
    "react/jsx-uses-react": "error",
    "react/jsx-uses-vars": "error",
    "react/jsx-wrap-multilines": "error",
    "react/no-children-prop": "error",
    "react/no-deprecated": "error",
    "react/no-did-mount-set-state": "error",
    "react/no-did-update-set-state": "error",
    "react/no-direct-mutation-state": "error",
    "react/no-find-dom-node": "error",
    "react/no-is-mounted": "error",
    "react/no-redundant-should-component-update": "error",
    "react/no-render-return-value": "error",
    "react/no-string-refs": "error",
    "react/no-will-update-set-state": "error",
    "react/prop-types": "error",
    "react/react-in-jsx-scope": "error",
    "react/require-render-return": "error",
    "react/self-closing-comp": "error",
    "react/sort-comp": "error",
    "react/style-prop-object": "error",
    "react/void-dom-elements-no-children": "error",

    "react/jsx-key": "warn",
    "react/no-array-index-key": "warn",
    "react/prefer-stateless-function": "warn"
  }
}