eslint.config.mjs

import { dirname } from "path";
import { FlatCompat } from "@eslint/eslintrc";
import * as path from "node:path";
import { fileURLToPath } from "node:url";
import { includeIgnoreFile } from "@eslint/compat";
import eslint from "@eslint/js";
import importPlugin from "eslint-plugin-import";
import unusedImportsPlugin from "eslint-plugin-unused-imports";
import tseslint from "typescript-eslint";

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const compat = new FlatCompat({
  baseDirectory: __dirname,
});

const nextConfig = [...compat.extends("next/core-web-vitals", "next/typescript")];

const baseConfig = tseslint.config(
  includeIgnoreFile(path.resolve(path.dirname(fileURLToPath(import.meta.url)), "./.gitignore")),
  { ignores: ["**/*.config.*"] },
  {
    files: ["**/*.js", "**/*.ts", "**/*.tsx"],
    plugins: {
      import: importPlugin,
      "unused-imports": unusedImportsPlugin,
    },
    extends: [
      eslint.configs.recommended,
      ...tseslint.configs.recommended,
      ...tseslint.configs.recommendedTypeChecked,
      ...tseslint.configs.stylisticTypeChecked,
    ],
    rules: {
      "@typescript-eslint/no-unused-vars": "off",
      "@typescript-eslint/consistent-type-imports": [
        "warn",
        { prefer: "type-imports", fixStyle: "separate-type-imports" },
      ],
      "@typescript-eslint/no-misused-promises": [2, { checksVoidReturn: { attributes: false } }],
      "@typescript-eslint/no-unnecessary-condition": [
        "error",
        {
          allowConstantLoopConditions: true,
        },
      ],
      "@typescript-eslint/no-non-null-assertion": "error",
      "import/consistent-type-specifier-style": ["error", "prefer-top-level"],
      "import/order": [
        "error",
        {
          alphabetize: {
            caseInsensitive: true,
            order: "asc",
          },
          pathGroups: [
            {
              pattern: "@/**",
              group: "internal",
              position: "before",
            },
          ],
          groups: [
            ["builtin", "external"],
            "internal",
            "parent",
            "sibling",
            "index",
            "object",
            "type",
          ],
          "newlines-between": "always",
          warnOnUnassignedImports: true,
          pathGroupsExcludedImportTypes: ["type"],
        },
      ],
      "unused-imports/no-unused-imports": "error",
      "unused-imports/no-unused-vars": [
        "warn",
        {
          vars: "all",
          varsIgnorePattern: "^_",
          args: "after-used",
          argsIgnorePattern: "^_",
        },
      ],
    },
  },
  {
    linterOptions: { reportUnusedDisableDirectives: true },
    languageOptions: { parserOptions: { projectService: true } },
  },
);

export default [...baseConfig, ...nextConfig];