.eslintrc.json

{
    "env": {
        "worker": true,
        "es6": true
    },
    "globals": {
        "base": "readonly",
        "input": "readonly",
        "output": "readonly",
        "session": "readonly"
    },
    "extends": ["eslint:recommended"],
    "plugins": ["prefer-let"],
    "parser": "babel-eslint",
    "parserOptions": {
        "sourceType": "script",
        "ecmaVersion": 6
    },
    "rules": {
        "array-callback-return": "error",
        "block-scoped-var": "error",
        "brace-style": "error",
        "camelcase": "error",
        "consistent-return": "error",
        "curly": "error",
        "default-case": "error",
        "eqeqeq": "error",
        "func-style": ["error", "declaration"],
        "guard-for-in": "error",
        "new-cap": "error",
        "new-parens": "error",
        "no-array-constructor": "error",
        "no-caller": "error",
        "no-confusing-arrow": "error",
        "no-empty": "error",
        "no-empty-function": "error",
        "no-eq-null": "error",
        "no-eval": "error",
        "no-extend-native": "error",
        "no-extra-bind": "error",
        "no-extra-label": "error",
        "no-iterator": "error",
        "no-label-var": "error",
        "no-labels": "error",
        "no-lone-blocks": "error",
        "no-loop-func": "error",
        "no-mixed-operators": ["error", {"groups": [["&&", "||"]]}],
        "no-multi-assign": "error",
        "no-nested-ternary": "error",
        "no-new-func": "error",
        "no-new-object": "error",
        "no-new-wrappers": "error",
        "no-proto": "error",
        "no-self-compare": "error",
        "no-sequences": "error",
        "no-shadow": "error",
        "no-template-curly-in-string": "error",
        "no-throw-literal": "error",
        "no-undef-init": "error",
        "no-unmodified-loop-condition": "error",
        "no-unneeded-ternary": "error",
        "no-unused-expressions": "error",
        "no-use-before-define": "error",
        "no-useless-call": "error",
        "no-useless-computed-key": "error",
        "no-useless-concat": "error",
        "no-useless-constructor": "error",
        "no-useless-rename": "error",
        "no-var": "error",
        "no-void": "error",
        "one-var-declaration-per-line": "error",
        "padded-blocks": ["error", "never"],
        "prefer-arrow-callback": "error",
        "prefer-const": "off",
        "prefer-object-spread": "error",
        "prefer-rest-params": "error",
        "prefer-spread": "error",
        "prefer-template": "error",
        "require-await": "error",
        "yoda": "error",

        "prefer-let/prefer-let": "error"
    }
}