.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true
  },
  "plugins": [
    "react"
  ],
  "extends": [
    "eslint:recommended",
    "plugin:react/recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true,
      "spread": true
    }
  },
  "settings": {
    "react": {
      "version": "15.6"
    }
  },
  "rules": {
    "indent": [
      "error",
      2, {
        "SwitchCase": 1
      }
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "error",
      "single"
    ],
    "semi": [
      "error",
      "never"
    ],
    "comma-dangle": [
      "error",
      "never"
    ],
    "space-before-function-paren": [
      "error", {
        "anonymous": "always",
        "named": "never"
      }
    ],
    "react/prop-types": [
      "error", {
      "skipUndeclared": true
    }],
    "react/display-name": "off"
  }
}