The best eslint configuration

.eslintrc

{
  "env": {
    "shared-node-browser": true,
    "es6": true,
    "mocha": true
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 7,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true,
      "modules": true,
      "blockBindings": true,
      "defaultParams": true,
      "forOf": true,
      "generators": true,
      "objectLiteralComputedProperties": true,
      "objectLiteralDuplicateProperties": false,
      "objectLiteralShorthandMethods": true,
      "objectLiteralShorthandProperties": true,
      "templateStrings": true,
      "experimentalObjectRestSpead": true
    }
  },
  "rules": {
    "quotes": [2, "single"],
    "strict": [2, "never"],
    "semi": [2, "never"],
    "brace-style": [2, "1tbs", {
      "allowSingleLine": true
    }],
    "comma-style": ["error", "first"],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-dangle": [2, "never"],
    "object-property-newline": ["error", { "allowMultiplePropertiesPerLine": true }],
    "object-curly-spacing": ["error", "always"],
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true, "mode": "strict" }],
    "rest-spread-spacing": ["error", "never"],
    "array-bracket-spacing": ["error", "always"],
    "no-dupe-keys": 2,
    "no-ex-assign": 2,
    "no-extra-semi": 2,
    "valid-typeof": 2,
    "generator-star-spacing": [2, {"before": false, "after": true}],
    "react/jsx-uses-react": 2,
    "react/jsx-uses-vars": 2,
    "react/react-in-jsx-scope": 2
  },
  "plugins": ["react"]
}