config.json

//.eslintrc
{
    "env": {
        "browser": true,
        "es6": true,
        "node": true,
        "jest": true
    },
    "parser": "babel-eslint",
    "plugins": [
        "react",
        "jest"
    ],
    "extends": [
        "eslint:recommended",
        "plugin:react/recommended",
        "plugin:import/warnings",
        "plugin:jest/recommended",
        "prettier"
    ],
    "rules": {
        "jsx-quotes": ["warn", "prefer-single"],
        "no-console": "error",
        "no-unused-vars": "error",
        "react/display-name": "error",

        "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }],
        "no-useless-escape": "error",
        "eqeqeq": "error",
        "no-eval": "error",
        "radix": "error",
        "no-bitwise": "error",
        "no-nested-ternary": "error",
        "no-var": "error",
        "react/sort-comp": "error",
        "react/sort-prop-types": "error",
        "react/jsx-sort-props": "error"
    },
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "globals": {
        "firebase": false
    }
}

//.prettierrc
{
  "semi": false,
  "singleQuote": true
}

// package.json
{
  "scripts": {
    "format": "prettier --write \"{src,config}/**/*{.js,.jsx}\"",
    "lint": "eslint --ext .jsx --ext .js src config",
    "precommit": "lint-staged",
  },
  "lint-staged": {
    "*.{js,jsx}": [
      "prettier --write",
      "eslint --fix",
      "git add"
    ],
    "*.less": [
      "prettier --write",
      "git add"
    ]
  }
}