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 [...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: 2020,
        sourceType: "module",

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

    rules: {
        semi: ["error", "always"],
    },
}, {
    files: ["**/*.svelte"],

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

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