eslint.config.mjs

import globals from "globals";
import path from "node:path";
import { fileURLToPath } from "node:url";
import js from "@eslint/js";
import { FlatCompat } from "@eslint/eslintrc";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const compat = new FlatCompat({
	baseDirectory: __dirname,
	recommendedConfig: js.configs.recommended,
	allConfig: js.configs.all,
});

export default [
	...compat.extends("eslint:recommended"),
	{
		languageOptions: {
			globals: {
				...globals.browser,
				...globals.jquery,
			},

			ecmaVersion: 2022,
			sourceType: "module",
		},

		rules: {
			"accessor-pairs": "off",

			"array-callback-return": "error",

			"arrow-spacing": ["error", {
				before: true,
				after: true,
			}],

			"block-spacing": ["error", "always"],

			"brace-style": ["error", "1tbs", {
				allowSingleLine: true,
			}],

			"comma-dangle": ["error", {
				arrays: "always-multiline",
				objects: "always-multiline",
				imports: "always-multiline",
				exports: "always-multiline",
				functions: "always-multiline",
			}],

			"comma-spacing": ["error", {
				before: false,
				after: true,
			}],

			"comma-style": ["error", "last"],
			"constructor-super": "error",
			curly: ["error", "multi-line"],
			"default-case-last": "error",
			"dot-location": ["error", "property"],

			eqeqeq: ["error", "always", {
				null: "ignore",
			}],

			"func-call-spacing": ["error", "never"],

			"generator-star-spacing": ["error", {
				before: false,
				after: true,
			}],

			"handle-callback-err": ["error", "^(err|error)$"],

			indent: ["error", "tab", {
				SwitchCase: 1,
			}],

			"key-spacing": ["error", {
				beforeColon: false,
				afterColon: true,
			}],

			"keyword-spacing": ["error", {
				before: true,
				after: true,
			}],

			"new-cap": ["error", {
				newIsCap: true,
				capIsNew: false,
			}],

			"new-parens": "error",
			"no-array-constructor": "error",
			"no-caller": "error",
			"no-class-assign": "error",
			"no-compare-neg-zero": "error",
			"no-cond-assign": "error",
			"no-const-assign": "error",

			"no-constant-condition": ["error", {
				checkLoops: false,
			}],

			"no-control-regex": "error",
			"no-debugger": "error",
			"no-delete-var": "error",
			"no-dupe-args": "error",
			"no-dupe-class-members": "error",
			"no-dupe-keys": "error",
			"no-duplicate-case": "error",
			"no-duplicate-imports": "error",
			"no-empty-character-class": "error",
			"no-empty-pattern": "error",
			"no-eval": "error",
			"no-ex-assign": "error",
			"no-extra-bind": "error",
			"no-extra-boolean-cast": "error",
			"no-extra-parens": ["error", "functions"],
			"no-fallthrough": "error",
			"no-floating-decimal": "error",
			"no-func-assign": "error",
			"no-global-assign": "error",
			"no-implied-eval": "error",
			"no-inner-declarations": ["error", "functions"],
			"no-invalid-regexp": "error",
			"no-irregular-whitespace": "error",
			"no-iterator": "error",
			"no-label-var": "error",

			"no-labels": ["error", {
				allowLoop: true,
				allowSwitch: false,
			}],

			"no-lone-blocks": "error",

			"no-mixed-operators": ["error", {
				groups: [
					["==", "!=", "===", "!==", ">", ">=", "<", "<="],
					["&&", "||"],
					["in", "instanceof"],
				],

				allowSamePrecedence: true,
			}],

			"no-mixed-spaces-and-tabs": "error",
			"no-multi-spaces": "error",
			"no-multi-str": "error",

			"no-multiple-empty-lines": ["error", {
				max: 1,
				maxEOF: 0,
			}],

			"no-negated-in-lhs": "error",
			"no-new": "error",
			"no-new-func": "error",
			"no-new-object": "error",
			"no-new-require": "error",
			"no-new-symbol": "error",
			"no-new-wrappers": "error",
			"no-obj-calls": "error",
			"no-octal": "error",
			"no-octal-escape": "error",
			"no-path-concat": "error",
			"no-proto": "error",
			"no-redeclare": "error",
			"no-regex-spaces": "error",
			"no-return-await": "error",
			"no-self-assign": "error",
			"no-self-compare": "error",
			"no-sequences": "error",
			"no-shadow-restricted-names": "error",
			"no-sparse-arrays": "error",
			"no-template-curly-in-string": "error",
			"no-this-before-super": "error",
			"no-throw-literal": "error",
			"no-trailing-spaces": "error",
			"no-undef": "off",
			"no-undef-init": "error",
			"no-unexpected-multiline": "error",
			"no-unmodified-loop-condition": "error",

			"no-unneeded-ternary": ["error", {
				defaultAssignment: false,
			}],

			"no-unreachable": "error",
			"no-unreachable-loop": "error",
			"no-unsafe-finally": "error",
			"no-unsafe-negation": "error",

			"no-unused-expressions": ["error", {
				allowShortCircuit: true,
				allowTernary: true,
				allowTaggedTemplates: true,
			}],

			"no-unused-vars": "off", // Too much legacy code from mothersite we might want later

			"no-use-before-define": ["error", {
				functions: false,
				classes: false,
				variables: false,
			}],

			"no-useless-assignment": "error",
			"no-useless-call": "error",
			"no-useless-computed-key": "error",
			"no-useless-constructor": "error",
			"no-useless-escape": "error",
			"no-useless-rename": "error",
			"no-useless-return": "error",
			"no-var": "error",
			"no-whitespace-before-property": "error",
			"no-with": "error",

			"object-property-newline": ["error", {
				allowMultiplePropertiesPerLine: true,
			}],

			"one-var": ["error", {
				initialized: "never",
			}],

			"operator-linebreak": ["error", "after", {
				overrides: {
					"?": "before",
					":": "before",
					"+": "before",
					"-": "before",
					"*": "before",
					"/": "before",
					"||": "before",
					"&&": "before",
				},
			}],

			"padded-blocks": ["error", {
				blocks: "never",
				switches: "never",
				classes: "never",
			}],
			"prefer-const": "off", // This should be on but no way am I trying to fix that
			"prefer-promise-reject-errors": "error",
			"rest-spread-spacing": ["error", "never"],

			"semi-spacing": ["error", {
				before: false,
				after: true,
			}],

			"space-before-blocks": ["error", "always"],
			"space-before-function-paren": ["error", "always"],
			"space-in-parens": ["error", "never"],
			"space-infix-ops": "error",

			"space-unary-ops": ["error", {
				words: true,
				nonwords: false,
			}],

			"spaced-comment": ["error", "always", {
				line: {
					markers: ["*package", "!", "/", ",", "="],
				},

				block: {
					balanced: true,
					markers: ["*package", "!", ",", ":", "::", "flow-include"],
					exceptions: ["*"],
				},
			}],

			"symbol-description": "error",
			"template-curly-spacing": ["error", "never"],
			"template-tag-spacing": ["error", "never"],
			"unicode-bom": ["error", "never"],
			"use-isnan": "error",

			"valid-typeof": ["error", {
				requireStringLiterals: true,
			}],

			"wrap-iife": ["error", "any", {
				functionPrototypeMethods: true,
			}],

			"yield-star-spacing": ["error", "both"],
			yoda: ["error", "never"],
			"no-prototype-builtins": "off",
			"require-atomic-updates": "off",
			"no-console": "off", // Console messages are good, actually
			"prefer-template": "error",

			quotes: ["error", "double", {
				allowTemplateLiterals: true,
			}],
		},
	},
];