.eslintrc

{
    "env": {
        "node": true
    },

    "parserOptions": {
        "sourceType": "module"
    },

    "rules": {
        // Possible errors
        "for-direction": "error",
        "getter-return": "error",
        "no-async-promise-executor": "error",
        "no-await-in-loop": "error",
        "no-compare-neg-zero": "error",
        "no-cond-assign": "error",
        "no-console": "off",
        "no-constant-condition": "off",
        "no-control-regex": "error",
        "no-debugger": "error",
        "no-dupe-args": "error",
        "no-dupe-keys": "error",
        "no-duplicate-case": "error",
        "no-empty": "error",
        "no-empty-character-class": "error",
        "no-ex-assign": "error",
        "no-extra-boolean-cast": "error",
        "no-extra-parens": "off",
        "no-extra-semi": "error",
        "no-func-assign": "error",
        "no-inner-declarations": ["error", "functions"],
        "no-invalid-regexp": "error",
        "no-irregular-whitespace": "error",
        "no-misleading-character-class": "error",
        "no-obj-calls": "error",
        "no-prototype-builtins": "error",
        "no-regex-spaces": "error",
        "no-sparse-arrays": "error",
        "no-template-curly-in-string": "error",
        "no-unexpected-multiline": "error",
        "no-unreachable": "error",
        "no-unsafe-finally": "error",
        "no-unsafe-negation": "error",
        "require-atomic-updates": "error",
        "use-isnan": "error",
        "valid-typeof": "error",

        // Best practices
        "accessor-pairs": "error",
        "array-callback-return": "error",
        "block-scoped-var": "off",
        "class-methods-use-this": "error",
        "complexity": "off", // TODO: enable
        "consistent-return": "error",
        "curly": ["error", "all"],
        "default-case": "error",
        "dot-location": ["error", "property"],
        "dot-notation": "error",
        "eqeqeq": ["error", "smart"],
        "guard-for-in": "error",
        "max-classes-per-file": "off",
        "no-alert": "error",
        "no-caller": "error",
        "no-case-declarations": "error",
        "no-div-regex": "error",
        "no-else-return": "off",
        "no-empty-function": "error",
        "no-empty-pattern": "error",
        "no-eq-null": "error",
        "no-eval": "error",
        "no-extend-native": "error",
        "no-extra-bind": "error",
        "no-extra-label": "error",
        "no-fallthrough": "off", // disabled due to bug in ESLint
        "no-floating-decimal": "error",
        "no-global-assign": "error",
        "no-implicit-coercion": "error",
        "no-implicit-globals": "error",
        "no-implied-eval": "error",
        "no-invalid-this": "error",
        "no-iterator": "error",
        "no-labels": "error",
        "no-lone-blocks": "error",
        "no-loop-func": "error",
        "no-magic-numbers": "off", // TODO: enable?
        "no-multi-spaces": "error",
        "no-multi-str": "error",
        "no-new": "error",
        "no-new-func": "error",
        "no-new-wrappers": "error",
        "no-octal": "error",
        "no-octal-escape": "error",
        "no-param-reassign": "off",
        "no-proto": "error",
        "no-redeclare": "error",
        "no-restricted-properties": "off",
        "no-return-assign": "error",
        "no-return-await": "error",
        "no-script-url": "error",
        "no-self-assign": "error",
        "no-self-compare": "error",
        "no-sequences": "error",
        "no-throw-literal": "error",
        "no-unmodified-loop-condition": "error",
        "no-unused-expressions": "error",
        "no-unused-labels": "error",
        "no-useless-call": "error",
        "no-useless-concat": "error",
        "no-useless-escape": "error",
        "no-useless-return": "error",
        "no-void": "error",
        "no-warning-comments": "off",
        "no-with": "error",
        "prefer-promise-reject-errors": "error",
        "radix": "error",
        "require-await": "error",
        "require-unicode-regexp": "off",
        "vars-on-top": "off", // TODO: enable
        "wrap-iife": ["error", "inside"],
        "yoda": "error",

        // Strict mode
        // "strict": ["error", "global"],

        // Variables
        "init-declarations": "off",
        "no-delete-var": "error",
        "no-label-var": "error",
        "no-restricted-globals": ["error", "app", "env"],
        "no-shadow": "error",
        "no-shadow-restricted-names": "error",
        "no-undef": "error",
        "no-undef-init": "error",
        "no-undefined": "off",
        "no-unused-vars": "error",
        "no-use-before-define": "error",

        // Node.js and CommonJS
        "callback-return": "off",
        "global-require": "off", // TODO: enable
        "handle-callback-err": "error",
        "no-buffer-constructor": "error",
        "no-mixed-requires": "error",
        "no-new-require": "error",
        "no-path-concat": "error",
        "no-process-env": "error",
        "no-process-exit": "error",
        "no-restricted-modules": "off",
        "no-sync": "off",

        // Stylistic issues
        "array-bracket-newline": "off",
        "array-bracket-spacing": ["error", "never"],
        "array-element-newline": "off",
        "block-spacing": ["error", "always"], "off", // TODO: enable with "stroustrup" (or "1tbsp" + lots of cleanup)
        "brace-style": ["error", "1tbs"],
        "camelcase": "error",
        "capitalized-comments": "off",
        "comma-dangle": "error",
        "comma-spacing": ["error", {
            "before": false,
            "after": true
        }],
        "comma-style": ["error", "last"],
        "computed-property-spacing": ["error", "never"],
        "consistent-this": ["error", "self"],
        "eol-last": "error",
        "func-call-spacing": ["error", "never"],
        "func-name-matching": ["error", "always"],
        "func-names": "off",
        "func-style": "off",
        "function-paren-newline": "off",
        "id-blacklist": "off",
        "id-length": "off",
        "id-match": "off",
        "implicit-arrow-linebreak": "off",
        "indent": ["error", 4, {
            "SwitchCase": 1
        }],
        "jsx-quotes": ["error", "prefer-double"],
        "key-spacing": ["error", {
            "beforeColon": false,
            "afterColon": true
        }],
        "keyword-spacing": ["error", {
            "before": true,
            "after": true
        }],
        "line-comment-position": "off",
        "linebreak-style": "off",
        "lines-around-comment": "off",
        "lines-between-class-members": "off",
        "max-depth": "off", // TODO: enable
        "max-len": "off", // TODO: enable
        "max-lines": "off",
        "max-lines-per-function": "off",
        "max-nested-callbacks": "off",
        "max-params": "off", // TODO: enable
        "max-statements": "off",
        "max-statements-per-line": "off",
        "multiline-comment-style": "off",
        "multiline-ternary": "off",
        "new-cap": "error",
        "new-parens": "error",
        "newline-per-chained-call": "off", // TODO: enable
        "no-array-constructor": "error",
        "no-bitwise": "error",
        "no-continue": "off",
        "no-inline-comments": "off",
        "no-lonely-if": "error",
        "no-mixed-operators": "error",
        "no-mixed-spaces-and-tabs": "error",
        "no-multi-assign": "off",
        "no-multiple-empty-lines": ["error", {
            "max": 2
        }],
        "no-negated-condition": "off",
        "no-nested-ternary": "error",
        "no-new-object": "error",
        "no-plusplus": "off",
        "no-restricted-syntax": "off",
        // "no-tabs": "error",
        "no-tabs": "off",
        "no-ternary": "off",
        "no-trailing-spaces": "error",
        "no-underscore-dangle": "off",
        "no-unneeded-ternary": "error",
        "no-whitespace-before-property": "error",
        "nonblock-statement-body-position": "off",
        "object-curly-newline": "off",
        "object-curly-spacing": "off",
        "object-property-newline": "error",
        "one-var": "off",
        "one-var-declaration-per-line": "error",
        "operator-assignment": "off",
        "operator-linebreak": ["error", "after"],
        "padded-blocks": ["error", "never"],
        "padding-line-between-statements": ["error", {
            "blankLine": "always",
            "prev": "*",
            "next": "return"
        }, {
            "blankLine": "always",
            "prev": ["const", "let", "var"],
            "next": "*"
        }, {
            "blankLine": "any",
            "prev": ["const", "let", "var"],
            "next": ["const", "let", "var"]
        }],
        "prefer-object-spread": "off",
        "quote-props": "off",
        "quotes": ["error", "single", "avoid-escape"],
        "semi": ["error", "always"],
        "semi-spacing": "error",
        "semi-style": ["error", "last"],
        "sort-keys": "off",
        "sort-vars": "off", // TODO: enable?
        "space-before-blocks": ["error", "always"],
        "space-before-function-paren": ["error", "never"],
        "space-in-parens": "off", // TODO: enable?
        "space-infix-ops": "error",
        "space-unary-ops": "error",
        "spaced-comment": ["error", "always"],
        "switch-colon-spacing": ["error", {
            "after": true,
            "before": false
        }],
        "template-tag-spacing": ["error", "never"],
        "unicode-bom": ["error", "never"],
        "wrap-regex": "off",

        // ECMAScript 2015
        "arrow-body-style": ["error", "as-needed"],
        "arrow-parens": "off",
        "arrow-spacing": ["error", {
            "before": true,
            "after": true
        }],
        "constructor-super": "error",
        "generator-star-spacing": ["error", {
            "before": true,
            "after": false
        }],
        "no-class-assign": "error",
        "no-confusing-arrow": "error",
        "no-const-assign": "error",
        "no-dupe-class-members": "error",
        "no-duplicate-imports": ["error", {
            "includeExports": true
        }],
        "no-new-symbol": "error",
        "no-restricted-imports": "off",
        "no-this-before-super": "error",
        "no-useless-computed-key": "error",
        "no-useless-constructor": "off",
        "no-useless-rename": "error",
        "no-var": "off",
        "object-shorthand": "off",
        "prefer-arrow-callback": "off",
        "prefer-const": "off",
        "prefer-destructuring": "off",
        "prefer-numeric-literals": "off",
        "prefer-rest-params": "off",
        "prefer-spread": "off",
        "prefer-template": "off",
        "require-yield": "error",
        "rest-spread-spacing": ["error", "never"],
        "sort-imports": "error",
        "symbol-description": "error",
        "template-curly-spacing": ["error", "never"],
        "yield-star-spacing": ["error", "before"]
    }
}