chore: update backend eslint to v9

Author: TCMeldrum

apps/backend/.eslintignore

@@ -0,0 +1,118 @@
+import eslint from '@eslint/js';
+import tsParser from '@typescript-eslint/parser';
+import { defineConfig } from 'eslint/config';
+import importPlugin from 'eslint-plugin-import';
+import jest from 'eslint-plugin-jest';
+import prettier from 'eslint-plugin-prettier';
+import unusedImports from 'eslint-plugin-unused-imports';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default defineConfig(
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+  importPlugin.flatConfigs.recommended,
+  importPlugin.flatConfigs.typescript,
+  {
+    files: ['**/*.{ts,js}'],
+    ignores: [
+      'build/*',
+      'coverage/*',
+      '**/*.d.ts', // data definition files
+      'src/public/', //3rd party libs
+      'src/types/', 
+      'openapi.yaml', //# auto-generated REST client for the STFC UserOfficeWebService
+      'generated/',
+      // node_modules is ignored by default
+    ],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        ecmaVersion: 'es2018',
+        sourceType: 'module',
+      },
+      globals: { ...globals.node },
+    },
+    // settings: {
+    //   node: {
+    //     extensions: ['.js', '.ts'],
+    //   }
+    // },
+    plugins: {
+      'unused-imports': unusedImports,
+      prettier,
+      jest
+    },
+    rules: {
+      semi: ['error', 'always'],
+      quotes: ['error', 'single'],
+      'no-console': 'error', // prefer `duo-logger` over console
+
+      'import/order': [
+        'error',
+        {
+          groups: [
+            'builtin',
+            'external',
+            'internal',
+            ['parent', 'sibling'],
+            'index',
+          ],
+          // distinctGroup: true,
+          pathGroups: [
+            {
+              pattern: '@src/**',
+              group: 'internal',
+              position: 'after',
+            },
+          ],
+          pathGroupsExcludedImportTypes: ['builtin'],
+          'newlines-between': 'always',
+          alphabetize: {
+            order: 'asc',
+            caseInsensitive: true,
+          },
+        },
+      ],
+
+      // TypeScript rules
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/naming-convention': [
+        'error',
+        {
+          selector: 'variable',
+          format: ['camelCase', 'PascalCase', 'UPPER_CASE'],
+          leadingUnderscore: 'allow',
+          trailingUnderscore: 'allow',
+        },
+        {
+          selector: 'function',
+          format: ['PascalCase', 'camelCase'],
+        },
+      ],
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/no-inferrable-types': [
+        'warn',
+        {
+          ignoreParameters: true,
+        },
+      ],
+      '@typescript-eslint/no-unused-vars': 'warn',
+      '@typescript-eslint/ban-ts-comment': 'warn',
+
+      // Other style rules
+      'padding-line-between-statements': [
+        'error',
+        { blankLine: 'always', prev: '*', next: 'return' },
+      ],
+
+      // Handle unused imports
+      'unused-imports/no-unused-imports': 'error',
+      //TS already handles undef variables
+      'no-undef': 'off',
+      'no-unused-vars': 'off',
+      'no-prototype-builtins': 'off',
+
+    },
+  },
+);

apps/backend/.eslintrc

@@ -108,23 +108,25 @@
     "@types/simple-oauth2": "^4.1.1",
     "@types/sinon": "^9.0.11",
     "@types/yup": "^0.29.13",
-    "@typescript-eslint/eslint-plugin": "^7.7.0",
-    "@typescript-eslint/parser": "^7.7.0",
+    "@typescript-eslint/parser": "^8.46.2",
     "@user-office-software/uows_client_generator": "^3.1.0",
-    "eslint": "^8.57.0",
+    "eslint": "^9.0.0",
     "eslint-config-prettier": "^9.1.0",
-    "eslint-plugin-import": "^2.26.0",
-    "eslint-plugin-jest": "^28.2.0",
+    "eslint-plugin-import": "^2.32.0",
+    "eslint-plugin-jest": "^29.0.1",
     "eslint-plugin-prettier": "^5.1.3",
-    "eslint-plugin-unused-imports": "^3.1.0",
+    "eslint-plugin-unused-imports": "^4.3.0",
+    "globals": "^16.5.0",
     "jest": "^29.7.0",
     "prettier": "3.2.4",
     "sinon": "^17.0.1",
     "ts-jest": "^29.1.1",
     "ts-node-dev": "^2.0.0",
     "tsconfig-paths": "^4.2.0",
-    "typescript": "^5.3.3"
+    "typescript": "^5.3.3",
+    "typescript-eslint": "^8.46.3"
   },
+  "type": "module",
   "engines": {
     "npm": ">=10.9.2",
     "node": ">=22.0.0"