chore: upgrade eslint to version 9

eslint.config.mjs

@@ -0,0 +1,116 @@
+import eslint from "@eslint/js"
+import tsParser from "@typescript-eslint/parser"
+import formatjs from "eslint-plugin-formatjs"
+import playwright from "eslint-plugin-playwright"
+import pluginPromise from "eslint-plugin-promise"
+import react from "eslint-plugin-react"
+import reactHooks from "eslint-plugin-react-hooks"
+import storybook from "eslint-plugin-storybook"
+import tsdoc from "eslint-plugin-tsdoc"
+import globals from "globals"
+import tseslint from "typescript-eslint"
+
+const config = tseslint.config([
+  {
+    ignores: [
+      "**/assets/*.js",
+      "!.storybook",
+      "**/dist/**",
+      "**/storybook-static/**",
+      "babel.config.js",
+      "eslint.config.mjs",
+      "examples/nextjs-spa/**", // This project is not maintained
+    ],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
+  {
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  pluginPromise.configs["flat/recommended"],
+  storybook.configs["flat/recommended"],
+  {
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          args: "all",
+          argsIgnorePattern: "^_",
+          caughtErrors: "all",
+          caughtErrorsIgnorePattern: "^_",
+          destructuredArrayIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          ignoreRestSiblings: true,
+        },
+      ],
+    },
+  },
+  {
+    files: ["**/*.{js,jsx,mjs,cjs,ts,tsx}"],
+    plugins: {
+      react,
+      "react-hooks": reactHooks,
+      tsdoc,
+      formatjs,
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+
+      parser: tsParser,
+      ecmaVersion: 2021,
+      sourceType: "module",
+
+      parserOptions: {
+        tsconfigRootDir: "./",
+
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+    },
+
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      "tsdoc/syntax": "warn",
+      "formatjs/no-offset": "error",
+      "@typescript-eslint/no-floating-promises": "error",
+      // The legacy elements is written with lots of any types
+      "no-unused-vars": "off",
+      "no-undef": "off",
+      "@typescript-eslint/consistent-type-definitions": "off",
+      "react/prop-types": "off",
+      "@typescript-eslint/no-unsafe-assignment": "off",
+      "@typescript-eslint/no-unsafe-member-access": "off",
+
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          argsIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          caughtErrorsIgnorePattern: "^_",
+        },
+      ],
+
+      "no-extra-semi": "off",
+    },
+  },
+  {
+    files: ["src/**/*.spec.ts"],
+    ...playwright.configs["flat/recommended"],
+    rules: {
+      ...playwright.configs["flat/recommended"].rules,
+      "no-empty-pattern": "off",
+    },
+  },
+])
+
+export default config

examples/nextjs-spa/package.json

@@ -6,12 +6,11 @@
     "dev": "NODE_OPTIONS='--inspect' next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint",
     "debug": "playwright test --ui"
   },
   "dependencies": {
     "@next/font": "13.4.13",
-    "next": "14.2.10",
+    "next": "15.0.3",
     "react": "18.3.1",
     "react-dom": "18.3.1"
   },
@@ -22,7 +21,7 @@
     "@types/node": "18.16.19",
     "@types/react": "18.3.3",
     "@types/react-dom": "18.3.0",
-    "eslint-config-next": "13.1.5",
+    "eslint-config-next": "15.0.3",
     "typescript": "5.2.2",
     "vite": "5.4.10"
   }