.eslintrc.json

{
    "parser": "babel-eslint",
    "env": {
        "browser": true,
        "node": true,
        "jest": true,
        "es6": true
    },
    "extends": ["eslint:recommended", "plugin:react/recommended"],
    "globals": {
        "Atomics": "readonly",
        "SharedArrayBuffer": "readonly"
    },
    "parserOptions": {
        "ecmaVersion": 6,
        "impliedStrict": true,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "plugins": ["react"],
    "settings": {
        "react": {
            "version": "detect"
        }
    },
    "rules": {
        "comma-dangle": "off",
        "comma-spacing": [
            "error",
            {
                "after": true,
                "before": false
            }
        ],
        "comma-style": ["error", "last"],
        "semi": "error",
        "indent": [
            "error",
            4,
            {
                "flatTernaryExpressions": true,
                "SwitchCase": 1
            }
        ],
        "jsx-quotes": ["error", "prefer-double"],
        "no-mixed-spaces-and-tabs": "error",
        "strict": "error",
        "max-len": ["error", 100],
        "prefer-const": "error",
        "no-console": "error",
        "no-const-assign": "error",
        "no-empty": [
            "error",
            {
                "allowEmptyCatch": true
            }
        ],
        "no-undef": "error",
        "no-unused-vars": "off",
        "no-var": "error",
        "no-extend-native": "error"
    }
}