.eslintrc.json

{
	"env": {
		"commonjs": true,
		"es6": true,
        "node": true,
        "jest/globals": true
    },
    "plugins": 
        ["gettext",
        "prettier",
        "jest"],
    "extends": [
        "eslint:recommended",
        "plugin:prettier/recommended"
    ],
	"globals": {
		"Atomics": "readonly",
		"SharedArrayBuffer": "readonly"
    },
	"parserOptions": {
        "ecmaVersion": 2018
	},
	"settings": {
		"polyfills": ["promises"]
	},
	"rules": {
        "prettier/prettier": "error",
		"no-console": "off",
		"no-sync": "off",
		"no-loops/no-loops": "off",
		"array-callback-return": "error",
        "comma-spacing": [
            "error",
            {
                "before": false,
                "after": true
            }
        ],
        "comma-style": ["error", "last"],
        "complexity": ["warn", 10],
        "curly": "error",
        "dot-notation": "error",
        "eqeqeq": "error",
        "gettext/no-variable-string": "error",
        "gettext/required-positional-markers-for-multiple-variables": "error",
        "handle-callback-err": "error",
        "linebreak-style": ["error", "unix"],
        "max-params": ["error", 5],
        "no-alert": "error",
        "no-array-constructor": "error",
        "no-caller": "error",
        "no-catch-shadow": "error",
        "no-confusing-arrow": "error",
        "no-duplicate-imports": "error",
        "no-eval": "error",
        "no-extend-native": "error",
        "no-extra-bind": "error",
        "no-floating-decimal": "error",
        "no-implicit-globals": "error",
        "no-implied-eval": "error",
        "no-inner-declarations": "error",
        "no-labels": "error",
        "no-loop-func": "error",
        "no-native-reassign": "error",
        "no-nested-ternary": "error",
        "no-new-func": "error",
        "no-new-object": "error",
        "no-new-wrappers": "error",
        "no-octal-escape": "error",
        "no-path-concat": "error",
        "no-proto": "warn",
        "no-return-assign": "error",
        "no-script-url": "error",
        "no-self-compare": "error",
        "no-sequences": "error",
        "no-shadow": "error",
        "no-shadow-restricted-names": "error",
        "no-throw-literal": "warn",
        "no-undef-init": "error",
        "no-unmodified-loop-condition": "error",
        "no-unneeded-ternary": "error",
        "no-unused-expressions": "error",
        "no-unused-vars": "error",
        "no-use-before-define": "error",
        "no-useless-call": "error",
        "no-useless-concat": "error",
        "no-with": "error",
        "quotes": ["error", "single", "avoid-escape"],
        "semi": ["error", "always"],
        "semi-spacing": [
            "error",
            {
                "before": false,
                "after": true
            }
		],
		"brace-style": ["error", "1tbs"],
        "block-spacing": "error",
        "camelcase": "error",
        "dot-location": ["error", "property"],
        "eol-last": ["error", "always"],
		"indent": [
			"error",
			4,
			{
				"SwitchCase": 1
			}
		],
        "key-spacing": [
            "error",
            {
                "beforeColon": false,
                "afterColon": true
            }
        ],
        "keyword-spacing": "error",
        "new-parens": "error",
        "newline-before-return": "error",
        "newline-per-chained-call": "error",
        "no-implicit-coercion": [
            "error",
            {
                "allow": ["!!"]
            }
        ],
        "no-lone-blocks": "error",
        "no-multi-spaces": "error",
        "no-multi-str": "error",
        "no-multiple-empty-lines": ["error", { "max": 2, "maxEOF": 0, "maxBOF": 0 }],
        "no-spaced-func": "error",
        "no-trailing-spaces": "error",
        "no-whitespace-before-property": "error",
        "object-curly-spacing": ["error", "always"],
        "one-var-declaration-per-line": "error",
        "operator-linebreak": [
            "error",
            "after",
            {
                "overrides": { "?": "before", ":": "before" }
            }
        ],
        "padded-blocks": ["error", { "blocks": "never", "classes": "never", "switches": "never" }],
        "space-in-parens": ["error", "never"],
        "space-infix-ops": "error",
        "space-unary-ops": "error",
        "yoda": ["error", "never"]
	}
}