.eslintrc.json

{

    "parserOptions": { "ecmaVersion": 8 },
    "env": { "es6": true },

    "rules": {

        "eqeqeq": "error",
        "no-use-before-define": ["error", {
            "functions": false,
            "variables": false
        }],
        "no-caller": "error",
        "no-undef": "error",
        "no-unused-vars": "warn",
        "no-constant-condition": ["error", { "checkLoops": false }],
        "no-const-assign": "error",
        "no-case-declarations": "error",
        "no-redeclare": "error",
        "no-cond-assign": "error",
        "no-dupe-args": "error",
        "no-dupe-keys": "error",
        "no-dupe-class-members": "error",
        "no-func-assign": "error",
        "no-inner-declarations": "error",
        "no-obj-calls": "error",
        "no-unreachable": "error",
        "valid-typeof": "error",
        "constructor-super": "error",
        "no-class-assign": "error",
        "no-new-symbol": "error",
        "no-this-before-super": "error",
        "prefer-spread": "warn",

        "curly": ["warn", "multi"],
        "camelcase": ["warn"],
        "wrap-iife": ["warn", "inside"],
        "quotes": ["warn", "single"],
        "semi": ["warn", "always"],
        "indent": ["warn", 4, { "SwitchCase": 1 }],
        "linebreak-style": ["warn", "unix"],
        "space-before-function-paren": ["warn", {
            "anonymous": "always",
            "named": "never",
            "asyncArrow": "always"
        }],
        "space-before-blocks": ["warn", "always"],
        "space-in-parens": ["warn", "never"],
        "key-spacing": ["warn", {
            "beforeColon": false,
            "afterColon": true,
            "mode": "minimum"
        }],
        "comma-spacing": ["warn", { "before": false, "after": true }],
        "semi-spacing": ["warn", { "before": false, "after": true }],
        "arrow-spacing": ["warn", { "before": true, "after": true }],
        "generator-star-spacing": ["warn", { "before": false, "after": true }],
        "func-call-spacing": ["warn", "never"],
        "keyword-spacing": "warn",
        "space-infix-ops": "warn",
        "no-multi-spaces": "warn",
        "no-whitespace-before-property": "warn",
        "comma-style": ["warn", "last"],
        "brace-style": ["warn", "stroustrup", { "allowSingleLine": true }],
        "comma-dangle": ["warn", {
            "arrays": "ignore",
            "objects": "never",
            "imports": "never",
            "exports": "never",
            "functions": "never"
        }],
        "array-bracket-spacing": ["warn", "never"],
        "object-curly-spacing": ["warn", "always"],
        "no-extra-semi": "warn",
        "no-delete-var": "warn",
        "computed-property-spacing": ["warn", "never"],
        "no-tabs": "warn"

    }

}