Migrate ESLint to v 9.x

This bumps needed dependencies and migrates previously used ESLint configs to the new flat config schema.

.eslintignore

@@ -1,8 +0,0 @@
-# Ignore programatically generated API slices
-imageBuilderApi.ts
-contentSourcesApi.ts
-rhsmApi.ts
-provisioningApi.ts
-edgeApi.ts
-complianceApi.ts
-composerCloudApi.ts

.eslintrc.yml

@@ -1,65 +0,0 @@
-extends: [
-    "plugin:jsx-a11y/recommended",
-    "@redhat-cloud-services/eslint-config-redhat-cloud-services",
-    "plugin:react/recommended",
-    "plugin:react-hooks/recommended",
-    "plugin:@typescript-eslint/recommended",
-    "plugin:react-redux/recommended"
-  ]
-globals:
-  insights: 'readonly'
-  shallow: readonly
-  render: 'readonly'
-  mount: 'readonly'
-parser: "@typescript-eslint/parser"
-parserOptions:
-  project: ["tsconfig.json"]
-plugins:
-  - import
-  - disable-autofix
-rules:
-  import/order:
-    - error
-    - groups:
-      - builtin
-      - external
-      - internal
-      - sibling
-      - parent
-      - index
-      alphabetize:
-        order: asc
-        caseInsensitive: true
-      newlines-between: always
-      pathGroups: # ensures the import of React is always on top
-      - pattern: react
-        group: builtin
-        position: before
-      pathGroupsExcludedImportTypes:
-      - react
-  prefer-const:
-    - error
-    - destructuring: any
-  no-console: error
-  eqeqeq: error
-  array-callback-return: warn
-  "@typescript-eslint/ban-ts-comment":
-    - error
-    - ts-expect-error: "allow-with-description"
-      ts-ignore: "allow-with-description"
-      ts-nocheck: true
-      ts-check: true
-      minimumDescriptionLength: 5
-  "@typescript-eslint/ban-types": off
-  disable-autofix/@typescript-eslint/no-unnecessary-condition: warn
-  # Temporarily disabled
-  jsx-a11y/no-autofocus: off
-  rulesdir/forbid-pf-relative-imports: off
-overrides:
-  - files: ["src/tests/**/*.ts"]
-    extends: "plugin:testing-library/react"
-  - files: ["playwright/**/*.ts"]
-    extends: "plugin:playwright/recommended"
-    rules:
-      playwright/no-conditional-in-test: off
-      playwright/no-conditional-expect: off

README.md

@@ -185,10 +185,13 @@ npx @rtk-query/codegen-openapi ./api/config/foobar.ts &
 ```
 
 
-6. Update the `.eslintignore` file by adding a new line for the generated code:
+6. Update the `eslint.config.js` file by adding the generated code path to the ignores array:
 
 ```
-foobarApi.ts
+ignores: [
+   <other ignored files>,
+  '**/foobarApi.ts',
+]
 ```
 
 7. run api generation
@@ -250,8 +253,19 @@ we're planning on using.
 
 ## Style Guidelines
 
-This project uses eslint's recommended styling guidelines. These rules can be found here:
-https://eslint.org/docs/rules/
+This project uses recommended rule sets rom several plugins:
+- `@eslint/js`
+- `typescript-eslint`
+- `eslint-plugin-react`
+- `eslint-plugin-react-hooks`
+- `eslint-plugin-react-redux`
+- `eslint-plugin-import`
+- `eslint-plugin-jsx-a11y`
+- `eslint-plugin-disable-autofix`
+- `eslint-plugin-jest-dom`
+- `eslint-plugin-testing-library`
+- `eslint-plugin-playwright`
+- `@redhat-cloud-services/eslint-config-redhat-cloud-services`
 
 To run the linter, use:
 ```bash
@@ -260,16 +274,10 @@ npm run lint
 
 Any errors that can be fixed automatically, can be corrected by running:
 ```bash
-npm run lint --fix
+npm run lint:js:fix
 ```
 
-All the linting rules and configuration of eslint can be found in [`.eslintrc.yml`](https://github.com/RedHatInsights/image-builder-frontend/blob/main/.eslintrc.yml).
-
-### Additional eslint rules
-There are also additional rules added to enforce code style. Those being:
-- `import/order` -> enforces the order in import statements and separates them into groups based on their type
-- `prefer-const` -> enforces use of `const` declaration for variables that are never reassigned
-- `no-console` -> throws an error for any calls of `console` methods leftover after debugging
+All the linting rules and configuration of ESLint can be found in [`eslint.config.js`](https://github.com/RedHatInsights/image-builder-frontend/blob/main/eslint.config.js).
 
 ## Test Guidelines
 

eslint.config.js

@@ -0,0 +1,144 @@
+const js = require('@eslint/js');
+const tseslint = require('typescript-eslint');
+const pluginReact = require('eslint-plugin-react');
+const pluginReactHooks = require('eslint-plugin-react-hooks');
+const pluginReactRedux = require('eslint-plugin-react-redux');
+const pluginImport = require('eslint-plugin-import');
+const fecConfig = require('@redhat-cloud-services/eslint-config-redhat-cloud-services');
+const pluginJsxA11y = require('eslint-plugin-jsx-a11y');
+const disableAutofix = require('eslint-plugin-disable-autofix');
+const jestDom = require('eslint-plugin-jest-dom');
+const pluginTestingLibrary = require('eslint-plugin-testing-library');
+const pluginPlaywright = require('eslint-plugin-playwright');
+const { defineConfig } = require('eslint/config');
+const globals = require('globals');
+
+module.exports = defineConfig([
+  { // Ignore programatically generated files
+    ignores: [
+      '**/mockServiceWorker.js',
+      '**/imageBuilderApi.ts',
+      '**/contentSourcesApi.ts',
+      '**/rhsmApi.ts',
+      '**/provisioningApi.ts',
+      '**/edgeApi.ts',
+      '**/complianceApi.ts',
+      '**/composerCloudApi.ts'
+    ]
+  },
+
+  { // Base config for js/ts files
+    files: ['**/*.{js,ts,jsx,tsx}'],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        project: './tsconfig.json'
+      },
+      globals: {
+        ...globals.browser,
+        // node
+        'JSX': 'readonly',
+        'process': 'readonly',
+        '__dirname': 'readonly',
+        'require': 'readonly',
+        // vitest
+        'describe': 'readonly',
+        'it': 'readonly',
+        'test': 'readonly',
+        'expect': 'readonly',
+        'vi': 'readonly',
+        'beforeAll': 'readonly',
+        'beforeEach': 'readonly',
+        'afterAll': 'readonly',
+        'afterEach': 'readonly'
+      },
+    },
+    plugins: {
+      js,
+      '@typescript-eslint': tseslint.plugin,
+      react: pluginReact,
+      'react-hooks': pluginReactHooks,
+      'react-redux': pluginReactRedux,
+      import: pluginImport,
+      jsxA11y: pluginJsxA11y,
+      'disable-autofix': disableAutofix,
+    },
+    rules: {
+      ...js.configs.recommended.rules,
+      ...tseslint.configs.recommended.rules,
+      ...pluginReact.configs.flat.recommended.rules,
+      ...pluginReactHooks.configs.recommended.rules,
+      ...pluginReactRedux.configs.recommended.rules,
+      ...fecConfig.rules,
+      'import/order': ['error', {
+        groups: ['builtin', 'external', 'internal', 'sibling', 'parent', 'index'],
+        alphabetize: {
+          order: 'asc',
+          caseInsensitive: true
+        },
+        'newlines-between': 'always',
+        pathGroups: [ // ensures the import of React is always on top
+          {
+            pattern: 'react',
+            group: 'builtin',
+            position: 'before'
+          }
+        ],
+        pathGroupsExcludedImportTypes: ['react']
+      }],
+      'prefer-const': ['error', {
+        destructuring: 'any',
+      }],
+      'no-console': 'error',
+      'eqeqeq': 'error',
+      'array-callback-return': 'warn',
+      '@typescript-eslint/ban-ts-comment': ['error', {
+        'ts-expect-error': 'allow-with-description',
+        'ts-ignore': 'allow-with-description',
+        'ts-nocheck': true,
+        'ts-check': true,
+        minimumDescriptionLength: 5,
+      }],
+      '@typescript-eslint/ban-types': 'off',
+      '@typescript-eslint/no-explicit-any': 'error',
+      '@typescript-eslint/no-unsafe-function-type': 'error',
+      '@typescript-eslint/no-require-imports': 'error',
+      'disable-autofix/@typescript-eslint/no-unnecessary-condition': 'warn',
+      'no-unused-vars': 'off', // disable js rule in favor of @typescript-eslint's rule
+      '@typescript-eslint/no-unused-vars': 'warn',
+      'jsx-a11y/no-autofocus': 'off',
+    },
+    settings: {
+      react: {
+        version: 'detect', // Automatically detect React version
+      },
+    },
+  },
+
+  { // Override for test files
+    files: ['src/test/**/*.{ts,tsx}'],
+    plugins: {
+      'jest-dom': jestDom,
+      'testing-library': pluginTestingLibrary,
+    },
+    rules: {
+      ...jestDom.configs.recommended.rules,
+      ...pluginTestingLibrary.configs.react.rules,
+      'react/display-name': 'off',
+      'react/prop-types': 'off',
+      'testing-library/no-debugging-utils': 'error'
+    },
+  },
+
+  { // Override for Playwright tests
+    files: ['playwright/**/*.ts'],
+    plugins: {
+      playwright: pluginPlaywright,
+    },
+    rules: {
+      ...pluginPlaywright.configs.recommended.rules,
+      'playwright/no-conditional-in-test': 'off',
+      'playwright/no-conditional-expect': 'off',
+    },
+  },
+]);

package.json

@@ -35,9 +35,10 @@
     "@babel/preset-react": "7.27.1",
     "@babel/preset-typescript": "7.27.1",
     "@currents/playwright": "1.15.1",
+    "@eslint/js": "9.30.1",
     "@patternfly/react-icons": "6.1.0",
     "@playwright/test": "1.51.1",
-    "@redhat-cloud-services/eslint-config-redhat-cloud-services": "2.0.12",
+    "@redhat-cloud-services/eslint-config-redhat-cloud-services": "3.0.0",
     "@redhat-cloud-services/frontend-components-config": "6.3.8",
     "@redhat-cloud-services/tsc-transform-imports": "1.0.25",
     "@rtk-query/codegen-openapi": "2.0.0",
@@ -60,7 +61,7 @@
     "chartjs-plugin-annotation": "3.1.0",
     "copy-webpack-plugin": "13.0.0",
     "css-loader": "7.1.2",
-    "eslint": "8.57.1",
+    "eslint": "9.30.1",
     "eslint-plugin-disable-autofix": "5.0.1",
     "eslint-plugin-import": "2.32.0",
     "eslint-plugin-jest-dom": "5.5.0",
@@ -71,6 +72,7 @@
     "eslint-plugin-react-redux": "4.2.2",
     "eslint-plugin-testing-library": "7.5.4",
     "git-revision-webpack-plugin": "5.0.0",
+    "globals": "16.3.0",
     "history": "5.3.0",
     "identity-obj-proxy": "3.0.0",
     "jsdom": "26.1.0",
@@ -90,6 +92,7 @@
     "ts-node": "10.9.2",
     "ts-patch": "3.3.0",
     "typescript": "5.8.3",
+    "typescript-eslint": "8.35.1",
     "uuid": "11.1.0",
     "vitest": "3.2.4",
     "vitest-canvas-mock": "0.3.3",

playwright/fixtures/cleanup.ts

@@ -11,7 +11,6 @@ export interface Cleanup {
 }
 
 export const test = oldTest.extend<WithCleanup>({
-  // eslint-disable-next-line no-empty-pattern
   cleanup: async ({}, use) => {
     const cleanupFns: Map<symbol, () => Promise<unknown>> = new Map();
 

playwright/fixtures/popupHandler.ts

@@ -11,7 +11,6 @@ export const test = base.extend<PopupHandlerFixture>({
   popupHandler: [
     async ({ page }, use) => {
       await closePopupsIfExist(page);
-      // eslint-disable-next-line react-hooks/rules-of-hooks
       await use(undefined);
     },
     { auto: true },

src/Components/CreateImageWizard/steps/Packages/Packages.tsx

@@ -814,8 +814,6 @@ const Packages = () => {
         return [];
       }
     }
-
-    return combinedGroupData;
   }, [
     dataDistroGroups,
     dataCustomGroups,

src/Components/sharedComponents/ImageBuilderHeader.tsx

@@ -2,7 +2,6 @@ import React, { useState } from 'react';
 
 import { Button, Popover, Content, Flex } from '@patternfly/react-core';
 import { ExternalLinkAltIcon, HelpIcon } from '@patternfly/react-icons';
-// eslint-disable-next-line rulesdir/disallow-fec-relative-imports
 import {
   OpenSourceBadge,
   PageHeader,

src/test/.eslintrc

@@ -1,18 +0,0 @@
-{
-  "env": {
-    "es6": true
-  },
-  "plugins": [
-    "testing-library",
-    "jest-dom"
-  ],
-  "rules": {
-    "react/display-name": "off",
-    "react/prop-types": "off",
-    "testing-library/no-debugging-utils": "error"
-  },
-  "extends": [
-    "plugin:testing-library/react",
-    "plugin:jest-dom/recommended"
-  ]
-}

src/test/mocks/cockpit/cockpitFile.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/no-unused-vars */
 import path from 'path';
 
 import { mockComposes } from '../../fixtures/composes';