.eslintrc.json

{
    "extends": "eslint:recommended",
    "env": {
        "browser": true,
        "node": true,
        "es6": true,
        "mocha": true
    },
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module"
    },
    "rules": {
        "semi": [2, "always"],
        "object-curly-spacing": [2, "always"],
        "max-len": ["error", 120],
        "quotes": ["error", "double", { "allowTemplateLiterals": true }],
        "keyword-spacing": ["error", {"before": true, "after": true}],
        "indent": ["error", 4, {"SwitchCase": 1}],
        "comma-spacing": ["error", { "before": false, "after": true }],
        "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
        "no-trailing-spaces": ["error", { "skipBlankLines": true }],
        "arrow-spacing": "error",
        "no-duplicate-imports": "error",
        "prefer-const": "error"
    }
}