.eslintrc

{
    "root": true,
    "parserOptions": {
        "ecmaVersion": 2017
    },
    "plugins": ["prettier"],
    "extends": [
        "eslint:recommended",
        "prettier"
    ],
    "rules": {
        "prettier/prettier": ["error"]
    },
    "env": {
        "node": true
    },
    "overrides": [
        {
            "files": ["*.ts"],
            "parser": "@typescript-eslint/parser",
            "plugins": ["@typescript-eslint"],
            "extends": [
                "plugin:@typescript-eslint/eslint-recommended",
                "plugin:@typescript-eslint/recommended",
                "prettier"
            ],
            "rules": {
                "@typescript-eslint/no-empty-interface": ["warn"]
            }
        },
        {
            "files": ["tests/**/*.js"],
            "env": {
                "mocha": true
            }
        }
    ]
}