.eslintrc.json

{
    "env": {
        "commonjs": true,
        "es6": true,
        "node": true
    },
    "extends": [
        "standard",
        "eslint:recommended",
        "plugin:jest/all"
    ],
    "plugins": [
        "markdown",
        "jest"
    ],
    "parserOptions": {
        "ecmaVersion": 2018
    },
    "rules": {
        "semi": [1, "always"],
        "no-unused-vars": ["warn", { "vars": "all", "args": "all", "ignoreRestSiblings": false, "caughtErrors": "all" }],
        "no-console": ["error"],
        "require-atomic-updates": ["error"],
        "quotes": ["error", "double", { "allowTemplateLiterals": true }],
        "block-spacing": ["error", "always"],
        "brace-style": ["warn", "1tbs", { "allowSingleLine": true }],
        "space-before-blocks": ["warn", { "functions": "always" }],
        "linebreak-style": ["error", "unix"],
        "lines-between-class-members": ["warn", "always"],
        "max-len": ["error", { "ignoreComments": true, "ignoreStrings": true }],
        "max-depth": ["error", 2],
        "space-before-function-paren": ["error", "never"],
        "prefer-const": ["error", { "destructuring": "all" }]
    },
    "overrides": [
        {
            "files": ["./tests/**/*.js"],
            "rules": {
                "no-unused-vars": ["warn", { "vars": "all", "args": "all", "ignoreRestSiblings": false }],
                "jest/prefer-expect-assertions": ["off"],
                "jest/prefer-called-with": ["off"],
                "jest/require-to-throw-message": ["warn"]
            }
        },
        {
            "files": ["./**/*.md"],
            "rules": {
                "no-undef": ["off"],
                "no-unused-vars": ["off"],
                "no-console": ["off"],
                "padded-blocks": ["off"],
                "max-len": ["off"]
            }
        }
    ]
}