.eslintrc.json

{
    "env": {
        "node": true,
        "es6": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "ecmaVersion": 2018,
        "sourceType": "module",
        "project": ["tsconfig.json", "test/tsconfig.json"]
    },
    "parser": "@typescript-eslint/parser",
    "plugins": ["@typescript-eslint"],
    "overrides": [
        {
            "files": "*.ts",
            "extends": [
                "plugin:@typescript-eslint/eslint-recommended",
                "plugin:@typescript-eslint/recommended-requiring-type-checking",
                "plugin:@typescript-eslint/recommended"
            ],
            "rules": {
                "@typescript-eslint/explicit-function-return-type": "off",
                "@typescript-eslint/no-floating-promises": "error",
                "@typescript-eslint/prefer-optional-chain": "error"
            }
        }
    ],
    "rules": {
        "array-callback-return": "error",
        "arrow-parens": ["error", "as-needed"],
        "comma-dangle": ["error", "always-multiline"],
        "curly": ["error", "all"],
        "dot-location": ["error", "property"],
        "dot-notation": "error",
        "eol-last": ["error", "always"],
        "eqeqeq": ["error", "always"],
        "for-direction": "error",
        "indent": ["error", 4, { "SwitchCase": 1 }],
        "linebreak-style": ["error", "unix"],
        "no-async-promise-executor": "error",
        "no-await-in-loop": "error",
        "no-console": "error",
        "no-dupe-else-if": "error",
        "no-else-return": "error",
        "no-extra-parens": ["error", "all"],
        "no-lonely-if": "error",
        "no-var": "error",
        "prefer-arrow-callback": "error",
        "prefer-const": ["warn", { "destructuring": "all" }],
        "quotes": ["error", "backtick"],
        "semi": ["error", "always"]
    }
}