chore: 🤖 upgrade to eslint v9 (#705)

upgrade to eslint v9 with flat config

Author: chimurai

.eslintignore

@@ -0,0 +1,49 @@
+import { defineConfig, globalIgnores } from 'eslint/config';
+import angular from 'angular-eslint';
+
+export default defineConfig([
+  globalIgnores([
+    'projects/spectator/test/**/*.ts',
+    'projects/spectator/jest/test/**/*.ts',
+    'projects/spectator/vitest/test/**/*.ts',
+    'projects/spectator/schematics/**/*.*',
+  ]),
+  {
+    files: ['**/*.ts'],
+    processor: angular.processInlineTemplates,
+    extends: [angular.configs.tsRecommended],
+    languageOptions: {
+      ecmaVersion: 5,
+      sourceType: 'script',
+
+      parserOptions: {
+        project: ['tsconfig.json', 'e2e/tsconfig.json'],
+        createDefaultProgram: true,
+      },
+    },
+    rules: {
+      'no-console': ['error'],
+      '@angular-eslint/component-selector': [
+        'error',
+        {
+          prefix: 'lib',
+          style: 'kebab-case',
+          type: 'element',
+        },
+      ],
+      '@angular-eslint/directive-selector': [
+        'error',
+        {
+          prefix: 'lib',
+          style: 'camelCase',
+          type: 'attribute',
+        },
+      ],
+    },
+  },
+  {
+    files: ['**/*.html'],
+    extends: [angular.configs.templateRecommended],
+    rules: {},
+  },
+]);

.eslintrc.json

@@ -36,11 +36,6 @@
     "@angular-builders/jest": "^18.0.0",
     "@angular-devkit/build-angular": "^19.0.1",
     "@angular-devkit/schematics": "^19.0.1",
-    "@angular-eslint/builder": "18.4.2",
-    "@angular-eslint/eslint-plugin": "18.4.2",
-    "@angular-eslint/eslint-plugin-template": "18.4.2",
-    "@angular-eslint/schematics": "18.4.2",
-    "@angular-eslint/template-parser": "18.4.2",
     "@angular/animations": "^19.0.0",
     "@angular/build": "^19.0.0",
     "@angular/cdk": "^19.0.0",
@@ -60,13 +55,14 @@
     "@types/jasmine": "5.1.4",
     "@types/jest": "29.5.11",
     "@types/node": "20.10.4",
-    "@typescript-eslint/eslint-plugin": "^7.2.0",
-    "@typescript-eslint/parser": "^7.2.0",
+    "@typescript-eslint/eslint-plugin": "^8.33.1",
+    "@typescript-eslint/parser": "^8.33.1",
     "all-contributors-cli": "^6.19.0",
+    "angular-eslint": "^19.8.0",
     "core-js": "^3.9.1",
     "cross-env": "^5.1.4",
     "cz-conventional-changelog": "^3.3.0",
-    "eslint": "^8.57.0",
+    "eslint": "^9.28.0",
     "git-cz": "^4.7.6",
     "helpful-decorators": "^2.1.0",
     "husky": "^8.0.2",
@@ -88,6 +84,7 @@
     "ts-node": "10.1.0",
     "tslib": "^2.6.2",
     "typescript": "5.6.3",
+    "typescript-eslint": "^8.33.1",
     "vite-tsconfig-paths": "^5.0.1",
     "vitest": "2.1.8",
     "zone.js": "0.15.0"

eslint.config.mjs

@@ -3,6 +3,7 @@ import { Component, NgModule } from '@angular/core';
 @Component({
   selector: 'lib-ngneat-host-component',
   template: '',
+  // eslint-disable-next-line @angular-eslint/prefer-standalone
   standalone: false,
 })
 export class HostComponent {}