Assist_Design/eslint.config.mjs

/* eslint-env node */
import process from "node:process";

import js from "@eslint/js";
import nextPlugin from "@next/eslint-plugin-next";
import reactHooks from "eslint-plugin-react-hooks";
import globals from "globals";
import tseslint from "typescript-eslint";

const TS_FILES = ["**/*.{ts,tsx}"];
const BFF_TS_FILES = ["apps/bff/**/*.ts"];
const PACKAGES_TS_FILES = ["packages/**/*.ts"];
const PORTAL_FILES = ["apps/portal/**/*.{js,jsx,ts,tsx}"];

const withFiles = (configs, files) =>
  configs.map(config => ({
    ...config,
    files,
  }));

export default [
  // =============================================================================
  // Global ignores
  // =============================================================================
  {
    ignores: [
      "**/node_modules/**",
      "**/dist/**",
      "**/.next/**",
      "**/.turbo/**",
      "**/.cache/**",
      "**/.pnpm-store/**",
      "**/.typecheck/**",
      "**/build/**",
      "**/coverage/**",
      "**/next-env.d.ts",
      "**/prisma/**",
    ],
  },

  // =============================================================================
  // Base JS
  // =============================================================================
  js.configs.recommended,

  // =============================================================================
  // TypeScript (fast rules, no type information)
  // =============================================================================
  ...withFiles(tseslint.configs.recommended, TS_FILES),

  // =============================================================================
  // TypeScript (type-aware rules) — only where we want the cost
  // =============================================================================
  ...tseslint.configs.recommendedTypeChecked.map(config => ({
    ...config,
    files: [...BFF_TS_FILES, ...PACKAGES_TS_FILES],
    languageOptions: {
      ...(config.languageOptions || {}),
      parserOptions: {
        ...((config.languageOptions && config.languageOptions.parserOptions) || {}),
        projectService: true,
        tsconfigRootDir: process.cwd(),
      },
    },
  })),

  // =============================================================================
  // Backend + domain packages: sensible defaults
  // =============================================================================
  {
    files: [...BFF_TS_FILES, "packages/domain/**/*.ts"],
    rules: {
      "@typescript-eslint/consistent-type-imports": "error",
      "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_", varsIgnorePattern: "^_" }],
      "no-console": ["warn", { allow: ["warn", "error"] }],
    },
  },

  // =============================================================================
  // Shared packages: stricter safety
  // =============================================================================
  {
    files: PACKAGES_TS_FILES,
    rules: {
      "@typescript-eslint/no-redundant-type-constituents": "error",
      "@typescript-eslint/no-explicit-any": "error",
      "@typescript-eslint/no-unsafe-return": "error",
      "@typescript-eslint/no-unsafe-call": "error",
      "@typescript-eslint/no-unsafe-member-access": "error",
    },
  },

  // =============================================================================
  // Portal (Next.js)
  // =============================================================================
  {
    ...nextPlugin.configs["core-web-vitals"],
    files: PORTAL_FILES,
  },
  {
    files: ["apps/portal/**/*.{jsx,tsx}"],
    plugins: { "react-hooks": reactHooks },
    rules: {
      "react-hooks/rules-of-hooks": "error",
      "react-hooks/exhaustive-deps": "warn",
    },
  },
  {
    files: ["apps/portal/**/*.{ts,tsx}"],
    rules: {
      "@typescript-eslint/no-unused-vars": [
        "error",
        {
          argsIgnorePattern: "^_",
          varsIgnorePattern: "^_",
        },
      ],
      "@next/next/no-html-link-for-pages": "off",
    },
  },

  // =============================================================================
  // Portal navigation guardrails
  // =============================================================================
  {
    files: ["apps/portal/src/app/(authenticated)/**/*.{ts,tsx}"],
    rules: {
      "no-restricted-syntax": [
        "error",
        {
          selector: "MemberExpression[object.name='window'][property.name='location']",
          message: "Use next/link or useRouter for navigation.",
        },
      ],
    },
  },
  {
    files: ["apps/portal/src/app/(authenticated)/layout.tsx"],
    rules: { "no-restricted-imports": "off" },
  },
  {
    files: ["apps/portal/src/app/(authenticated)/billing/invoices/[id]/page.tsx"],
    rules: { "no-restricted-syntax": "off" },
  },

  // =============================================================================
  // Architecture: import boundaries
  // =============================================================================
  {
    files: ["apps/portal/src/**/*.{ts,tsx}", "apps/bff/src/**/*.ts"],
    rules: {
      "no-restricted-imports": [
        "error",
        {
          patterns: [
            {
              group: ["@customer-portal/domain/**/src/**"],
              message: "Import from @customer-portal/domain/<module> instead of internals.",
            },
          ],
        },
      ],
    },
  },

  // =============================================================================
  // BFF: stricter type safety (type-aware)
  // =============================================================================
  {
    files: BFF_TS_FILES,
    rules: {
      "@typescript-eslint/no-explicit-any": "error",
      "@typescript-eslint/no-unsafe-assignment": "error",
      "@typescript-eslint/no-unsafe-member-access": "error",
      "@typescript-eslint/no-unsafe-call": "error",
      "@typescript-eslint/no-unsafe-return": "error",
      "@typescript-eslint/no-unsafe-argument": "error",
      "@typescript-eslint/require-await": "error",
      "@typescript-eslint/no-floating-promises": "error",
    },
  },

  // =============================================================================
  // Node globals for tooling/config files
  // =============================================================================
  {
    files: [
      "*.config.*",
      "apps/portal/next.config.mjs",
      "config/**/*.{js,cjs,mjs}",
      "scripts/**/*.{js,cjs,mjs}",
      "apps/**/scripts/**/*.{js,cjs,mjs}",
    ],
    languageOptions: {
      globals: { ...globals.node },
    },
  },
];