eslint.config.mjs

import typescriptEslint from "@typescript-eslint/eslint-plugin";
import prettier from "eslint-plugin-prettier";
import tsParser from "@typescript-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",
    "prettier",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
  ),
  {
    files: ["./src/*.{ts,tsx}", "./test/*.{ts,tsx}"],
    plugins: {
      "@typescript-eslint": typescriptEslint,
      prettier,
    },

    languageOptions: {
      globals: {},
      parser: tsParser,
      ecmaVersion: 5,
      sourceType: "script",

      parserOptions: {
        project: "./tsconfig.json",
      },
    },

    rules: {
      "prettier/prettier": "warn",

      "spaced-comment": [
        "error",
        "always",
        {
          markers: ["/"],
        },
      ],

      "no-fallthrough": "error",
      "@typescript-eslint/ban-ts-comment": "warn",

      "@typescript-eslint/consistent-type-imports": [
        "error",
        {
          prefer: "type-imports",
        },
      ],

      "@typescript-eslint/no-inferrable-types": [
        "error",
        {
          ignoreParameters: false,
          ignoreProperties: false,
        },
      ],

      "@typescript-eslint/no-non-null-assertion": "off",
      "@typescript-eslint/no-floating-promises": "error",

      "@typescript-eslint/no-unused-vars": [
        "warn",
        {
          args: "after-used",
          argsIgnorePattern: "^_",
          varsIgnorePattern: "^_",
          ignoreRestSiblings: true,
        },
      ],

      "@typescript-eslint/no-empty-function": ["error"],
      "@typescript-eslint/restrict-template-expressions": "off",
    },
  },
];