chore: upgrade to eslint v9

common/eslint.config.mjs

@@ -0,0 +1,68 @@
+import eslint from "@eslint/js";
+// @if babel
+import babelParser from "@babel/eslint-parser";
+// @endif
+// @if typescript
+import tseslint from 'typescript-eslint';
+import tsParser from "@typescript-eslint/parser";
+// @endif
+import globals from "globals";
+
+export default [
+  eslint.configs.recommended,
+  // @if typescript
+  ...tseslint.configs.recommended,
+  // @endif
+  {
+    root: true,
+    // @if typescript
+    files: ["**/*.ts"],
+    // @endif
+
+    rules: {
+      "no-unused-vars": 0,
+      // @if typescript
+      "@typescript-eslint/no-unused-vars": 0,
+      "@typescript-eslint/no-explicit-any": 0,
+      // @endif
+      "no-prototype-builtins": 0,
+      "no-console": 0,
+      "getter-return": 0
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.builtin,
+        ...globals.nodeBuiltin,
+        ...globals.browser,
+        ...globals.node,
+        // @if karma
+        ...globals.jasmine,
+        // @endif
+        // @if jest
+        ...globals.jest,
+        // @endif
+      },
+
+      // @if babel
+      parser: babelParser,
+      // @endif
+      // @if typescript
+      parser: tsParser,
+      // @endif
+      ecmaVersion: 2019,
+      sourceType: "module",
+      parserOptions: {
+        // @if babel
+        ecmaFeatures: {
+          legacyDecorators: true
+        },
+        // @endif
+        // @if typescript
+        project: "./tsconfig.json",
+        tsconfigRootDir: ".",
+        // @endif
+      },
+    },
+  }
+];

common/package.json

@@ -14,7 +14,8 @@
   },
   // @endif
   "devDependencies": {
-    "eslint": "^8.43.0",
+    "eslint": "^9.13.0",
+    "globals": "^15.10.0",
     "aurelia-cli": "^3.0.3",
     "aurelia-testing": "^1.1.0",
     "gulp": "^4.0.2",
@@ -28,21 +29,20 @@
     // @endif
 
     // @if babel
-    "@babel/eslint-parser": "^7.25.8",
-    "@babel/plugin-proposal-decorators": "^7.25.7",
+    "@babel/eslint-parser": "^7.25.9",
+    "@babel/plugin-proposal-decorators": "^7.25.9",
     "@babel/plugin-syntax-dynamic-import": "^7.8.3",
-    "@babel/preset-env": "^7.25.8",
+    "@babel/preset-env": "^7.25.9",
     "@babel/core": "^7.25.8",
-    "@babel/register": "^7.25.7",
+    "@babel/register": "^7.25.9",
     "regenerator-runtime": "^0.14.1",
     // @endif
 
     // @if typescript
     "typescript": "^5.6.3",
     "tslib": "^2.8.0",
-    "@types/node": "^22.7.8",
-    "@typescript-eslint/eslint-plugin": "^8.11.0",
-    "@typescript-eslint/parser": "^8.11.0",
+    "@types/node": "^22.7.9",
+    "typescript-eslint": "^8.8.1",
     // @endif
   },
   // @if postcss || babel

jest/package.json

@@ -12,7 +12,7 @@
 
     // @if typescript
     "ts-jest": "^29.2.5",
-    "@types/jest": "^29.5.13",
+    "@types/jest": "^29.5.14",
     // @endif
   },
   "scripts": {

webpack/package.json

@@ -28,15 +28,15 @@
 
     // @if sass
     "sass-loader": "^16.0.2",
-    "sass": "^1.80.3",
+    "sass": "^1.80.4",
     // @endif
 
     // @if stylus
     "stylus-loader": "^8.1.1",
     "stylus": "^0.64.0",
     // @endif
 
-    "html-webpack-plugin": "^5.6.2",
+    "html-webpack-plugin": "^5.6.3",
     "copy-webpack-plugin": "^12.0.2",
     "mini-css-extract-plugin": "^2.9.1",
     "aurelia-webpack-plugin": "^5.0.6",