.eslintrc.json

{
    "env": {
        "browser": true,
        "es6": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "sourceType": "module"
    },
    "rules": {
        "camelcase": "error",
        "eol-last": "error",
        "eqeqeq": "error",
        "indent":
            [2, 4, {"SwitchCase": 1}],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "no-console": "off",
        "no-trailing-spaces": "error",
        "quotes": [
            "error",
            "single"
        ],
        "semi": [
            "error",
            "always"
        ]
    },
    "overrides": [{
        "files": ["tests/unit/**/*.js"],
        "parserOptions": {
            "ecmaVersion": 8,
            "sourceType": "module"
        },
        "env": {
            "mocha": true
        },
        "rules": {
            "camelcase": "error",
            "eol-last": "error",
            "eqeqeq": "error",
            "indent": ["error", 2],
            "linebreak-style": [
                "error",
                "unix"
            ],
            "no-console": "off",
            "no-trailing-spaces": "error",
            "quotes": [
                "error",
                "backtick"
            ],
            "semi": [
                "error",
                "always"
            ]
        }
    }]
}