eslint.config.js

// @ts-check
import { FlatCompat } from "@eslint/eslintrc";
import eslint from "@eslint/js";
import mochaPlugin from "eslint-plugin-mocha";
import prettierRecommended from "eslint-plugin-prettier/recommended";
import reactJsxRuntime from "eslint-plugin-react/configs/jsx-runtime.js";
import reactRecommended from "eslint-plugin-react/configs/recommended.js";
import tseslint from "typescript-eslint";

const compat = new FlatCompat({
  baseDirectory: import.meta.dirname,
});

export default tseslint.config(
  {
    ignores: [
      "**/dist/",
      "**/lib/",
      "**/target/",
      "./apps/keycloak-server/server/",
      // Keycloak JS follows a completely different and outdated style, so we'll exclude it for now.
      "./libs/keycloak-js/",
    ],
  },
  eslint.configs.recommended,
  ...tseslint.configs.strictTypeChecked,
  ...tseslint.configs.stylisticTypeChecked,
  reactRecommended,
  reactJsxRuntime,
  ...compat.extends("plugin:react-hooks/recommended"),
  prettierRecommended,
  ...compat.plugins("lodash"),
  {
    languageOptions: {
      parserOptions: {
        project: "./tsconfig.eslint.json",
        tsconfigRootDir: import.meta.dirname,
      },
    },
    settings: {
      react: {
        version: "18",
      },
    },
    rules: {
      // ## Rules overwriting config, disabled for now, but will have to be evaluated. ##
      "no-undef": "off",
      "no-unused-private-class-members": "off",
      "@typescript-eslint/array-type": "off",
      "@typescript-eslint/ban-ts-comment": "off",
      "@typescript-eslint/ban-tslint-comment": "off",
      "@typescript-eslint/ban-types": "off",
      "@typescript-eslint/consistent-indexed-object-style": "off",
      "@typescript-eslint/consistent-type-definitions": "off",
      "@typescript-eslint/dot-notation": "off",
      "@typescript-eslint/no-base-to-string": "off",
      "@typescript-eslint/no-confusing-non-null-assertion": "off",
      "@typescript-eslint/no-confusing-void-expression": "off",
      "@typescript-eslint/no-duplicate-type-constituents": "off",
      "@typescript-eslint/no-dynamic-delete": "off",
      "@typescript-eslint/no-explicit-any": "off",
      "@typescript-eslint/no-extraneous-class": "off",
      "@typescript-eslint/no-floating-promises": "off",
      "@typescript-eslint/no-inferrable-types": "off",
      "@typescript-eslint/no-invalid-void-type": "off",
      "@typescript-eslint/no-misused-promises": "off",
      "@typescript-eslint/no-non-null-asserted-optional-chain": "off",
      "@typescript-eslint/no-non-null-assertion": "off",
      "@typescript-eslint/no-redundant-type-constituents": "off",
      "@typescript-eslint/no-unnecessary-boolean-literal-compare": "off",
      "@typescript-eslint/no-unnecessary-condition": "off",
      "@typescript-eslint/no-unnecessary-type-arguments": "off",
      "@typescript-eslint/no-unnecessary-type-assertion": "off",
      "@typescript-eslint/no-unsafe-argument": "off",
      "@typescript-eslint/no-unsafe-assignment": "off",
      "@typescript-eslint/no-unsafe-call": "off",
      "@typescript-eslint/no-unsafe-enum-comparison": "off",
      "@typescript-eslint/no-unsafe-member-access": "off",
      "@typescript-eslint/no-unsafe-return": "off",
      "@typescript-eslint/no-useless-constructor": "off",
      "@typescript-eslint/no-useless-template-literals": "off",
      "@typescript-eslint/non-nullable-type-assertion-style": "off",
      "@typescript-eslint/only-throw-error": "off",
      "@typescript-eslint/prefer-for-of": "off",
      "@typescript-eslint/prefer-nullish-coalescing": "off",
      "@typescript-eslint/prefer-promise-reject-errors": "off",
      "@typescript-eslint/prefer-reduce-type-parameter": "off",
      "@typescript-eslint/prefer-ts-expect-error": "off",
      "@typescript-eslint/require-await": "off",
      "@typescript-eslint/restrict-plus-operands": "off",
      "@typescript-eslint/restrict-template-expressions": "off",
      "@typescript-eslint/unbound-method": "off",
      "@typescript-eslint/use-unknown-in-catch-callback-variable": "off",
      // ## Rules that are customized because of team preferences or other issues ##
      // Prevent default imports from React, named imports should be used instead.
      // This is a team preference, but also helps us enforce consistent imports.
      "no-restricted-imports": [
        "error",
        {
          paths: [
            {
              name: "react",
              importNames: ["default"],
            },
          ],
        },
      ],
      // Prefer using the `#private` syntax for private class members, we want to keep this consistent and use the same syntax.
      "no-restricted-syntax": [
        "error",
        {
          selector:
            ':matches(PropertyDefinition, MethodDefinition)[accessibility="private"]',
          message: "Use #private instead",
        },
      ],
      // Require using arrow functions for callbacks, the team prefers this style over inconsistent function declarations.
      "prefer-arrow-callback": "error",
      // `react/prop-types` cannot handle generic props, so we need to disable it.
      // https://github.com/yannickcr/eslint-plugin-react/issues/2777#issuecomment-814968432
      "react/prop-types": "off",
      // Prevent fragments from being added that have only a single child.
      "react/jsx-no-useless-fragment": "error",
      // Ban nesting components, as this will cause unintended re-mounting of components.
      // See: https://react.dev/learn/your-first-component#nesting-and-organizing-components
      "react/no-unstable-nested-components": ["error", { allowAsProps: true }],
      // Prefer a specific import scope (e.g. `lodash/map` vs `lodash`).
      // Allows for more efficient tree-shaking and better code splitting.
      "lodash/import-scope": ["error", "member"],
    },
  },
  ...[
    ...compat.extends("plugin:cypress/recommended"),
    mochaPlugin.configs.flat.recommended,
  ].map((config) => ({
    ...config,
    files: ["**/cypress/**/*"],
  })),
  {
    files: ["**/cypress/**/*"],
    // TODO: Set these rules to "error" when issues have been resolved.
    rules: {
      "cypress/no-unnecessary-waiting": "warn",
      "cypress/unsafe-to-chain-command": "warn",
      "mocha/max-top-level-suites": "off",
      "mocha/no-exclusive-tests": "error",
      "mocha/no-identical-title": "off",
      "mocha/no-mocha-arrows": "off",
      "mocha/no-setup-in-describe": "off",
    },
  },
);