eslint.config.mjs

import typescriptEslint from "@typescript-eslint/eslint-plugin";
import globals from "globals";
import tsParser from "@typescript-eslint/parser";
import parser from "svelte-eslint-parser";
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 [
	{
		ignores: [".svelte-kit/*", "build/*", "coverage/*", "node_modules/*"],
	},
	...compat.extends(
		"eslint:recommended",
		"plugin:@typescript-eslint/recommended",
		"plugin:svelte/recommended",
		"prettier",
	),
	{
		plugins: {
			"@typescript-eslint": typescriptEslint,
		},

		languageOptions: {
			globals: {
				...globals.browser,
				...globals.node,
			},

			parser: tsParser,
			ecmaVersion: "latest",
			sourceType: "module",

			parserOptions: {
				extraFileExtensions: [".svelte"],
			},
		},

		rules: {
			indent: ["error", "tab"],
			"linebreak-style": ["error", "unix"],
			quotes: ["error", "double"],
			semi: ["error", "always"],

			"@typescript-eslint/no-unused-vars": [
				"warn",
				{
					argsIgnorePattern: "^_",
				},
			],
		},
	},
	{
		files: ["**/*.svelte"],

		languageOptions: {
			parser: parser,
			ecmaVersion: 5,
			sourceType: "script",

			parserOptions: {
				parser: "@typescript-eslint/parser",
			},
		},
	},
];