ESLint JSON File

.eslintrc.json

{
    "extends": [
		"eslint:recommended",
		"plugin:react/recommended"
	],
    "rules": {
        // enable additional rules
        "indent": ["error", 4, {"SwitchCase": 1}],
        "linebreak-style": ["error", "unix"],
        "quotes": ["warn", "single"],
        "semi": ["error", "always"],

        // override default options for rules from base configurations
        "comma-dangle": ["off", "always"],
        "no-cond-assign": ["error", "always"],

        // disable rules from base configurations
        "no-console": "off",
        "no-control-regex": "warn"
    },
    "parser":  "babel-eslint",
    "parserOptions": {
        "ecmaVersion": 7,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "env": {
        "browser": true,
        "node": true,
        "jest": true,
        "es6": true
    },
    "settings": {
        "react": {
            "pragma": "React",
            "version": "16.6.0"
        }
    }
}

You may need to run one or more of the following:

yarn global add eslint
yarn global add babel-eslint

npm -g install eslint
npm -g install babel-eslint

Test with

eslint .