.eslintrc.json

{
    "extends": [
        "eslint:all",
        "eslint:recommended"
    ],
    "env": {
        "es6": true,
        "browser": false,
        "serviceworker": false
    },
    "parserOptions": {
        "ecmaVersion": 8,
        "ecmaFeatures": {},
        "sourceType": "script"
    },
    "rules": {
        // Possible Errors
        "for-direction": "warn",
        "getter-return": "warn",
        "no-extra-parens": ["warn", "all", { "nestedBinaryExpressions": false }],
        "no-unreachable": "error",
        "valid-jsdoc": ["warn", {"requireParamDescription": false, "requireReturnDescription": false }],
        // Best Practices
        "array-callback-return": "warn",
        "block-scoped-var": "warn",
        "complexity": "warn",
        "consistent-return": "warn",
        "curly": "warn",
        "default-case": "warn",
        "dot-location": "warn",
        "eqeqeq": "warn",
        "guard-for-in": "warn",
        "no-alert": "error",
        "no-caller": "warn",
        "no-div-regex": "warn",
        "no-else-return": "warn",
        "no-empty-function": "warn",
        "no-eq-null": "warn",
        "no-eval": "error",
        "no-extend-native": "warn",
        "no-extra-bind": "warn",
        "no-extra-label": "warn",
        "no-fallthrough": "warn",
        "no-floating-decimal": "warn",
        "no-implicit-coercion": "warn",
        "no-implied-eval": "error",
        "no-invalid-this": "warn",
        "no-iterator": "warn",
        "no-labels": "warn",
        "no-lone-blocks": "warn",
        "no-loop-func": "warn",
        "no-magic-numbers": ["warn", { "ignoreArrayIndexes": true }],
        "no-multi-spaces": "warn",
        "no-multi-str": "warn",
        "no-new": "warn",
        "no-new-func": "warn",
        "no-new-wrappers": "warn",
        "no-octal-escape": "warn",
        "no-proto": "warn",
        "no-redeclare": "error",
        "no-return-assign": "warn",
        "no-return-await": "warn",
        "no-script-url": "warn",
        "no-self-compare": "warn",
        "no-sequences": "warn",
        "no-throw-literal": "warn",
        "no-unmodified-loop-condition": "warn",
        "no-unused-expressions": "warn",
        "no-useless-call": "warn",
        "no-useless-concat": "warn",
        "no-useless-return": "warn",
        "no-void": "warn",
        "no-warning-comments": "warn",
        "no-with": "warn",
        "prefer-promise-reject-errors": "warn",
        "radix": "warn",
        "require-await": "warn",
        "wrap-iife": "warn",
        "yoda": "warn",
        // Strict Mode
        "strict": ["warn", "global"],
        // Variables
        "no-undef": "error",
        "no-unused-vars": "error",
        // Stylistic Issues
        "no-mixed-spaces-and-tabs": ["warn", "smart-tabs"],
        "semi": "warn",
        // ECMAScript 6
        "constructor-super": "error",
        "no-const-assign": "warn",
        "no-this-before-super": "warn"
    }
}