eslint.config.mjs

import eslint from "@eslint/js";
import tseslint from "typescript-eslint";
import stylistic from "@stylistic/eslint-plugin";

export default tseslint.config({
    files: ["**/*.ts", "**/*.mjs"],
    extends: [
        eslint.configs.recommended,
        tseslint.configs.strictTypeChecked,
        tseslint.configs.stylisticTypeChecked,
        stylistic.configs["recommended-flat"],
    ],
    languageOptions: {
        parserOptions: { projectService: true, project: true },
    },
    rules: {
        "@typescript-eslint/explicit-function-return-type": [
            "error", { allowExpressions: true },
        ],

        // formatting
        "@stylistic/indent": ["warn", 4],
        "@stylistic/member-delimiter-style": ["warn",
            { multiline: { delimiter: "semi", requireLast: true } },
        ],
        "@stylistic/semi": ["warn", "always"],
        "@stylistic/quotes": ["warn", "double", { avoidEscape: true }],
        "@stylistic/brace-style": ["warn", "1tbs"],
        "@stylistic/arrow-parens": ["warn", "as-needed"],
    },
});