.eslintrc

{
  "extends": ["airbnb", "prettier", "plugin:flowtype/recommended"],
  "rules": {
    "no-underscore-dangle": "off",
    "no-param-reassign": "off",
    "class-methods-use-this": "warn",
    "import/no-unresolved": "off",
    "import/no-extraneous-dependencies": 0,
    "import/prefer-default-export": 0,
    "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }],
    "react/prop-types": 0,
    "react/jsx-wrap-multilines": 0,
    "jsx-a11y/click-events-have-key-events": 0
  },
  "plugins": ["import", "flowtype"],
  "env": {
    "browser": true,
    "node": true,
    "jasmine": true,
    "jest": true
  }
}

.prettierrc

{
  "useTabs": false,
  "printWidth": 100,
  "tabWidth": 2,
  "singleQuote": true,
  "trailingComma": "all",
  "jsxBracketSameLine": false,
  "semi": false
}

package.json

{
  "name": "your-name",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    ...
  },
  "scripts": {
    ...
    "lint": "eslint ./src",
    "format": "prettier --write \"src/**/*.+(js|jsx|json|yml|yaml|css)\""
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    ...
  },
  "devDependencies": {
    ...
  },
  "husky": {
    "hooks": {
      "pre-commit": "npm run lint && npm run format"
    }
  }
}