Upgrade eslint

.github/dependabot.yml

@@ -25,6 +25,3 @@ updates:
           - 'patch'
     ignore:
       - dependency-name: '@playwright/test'
-      - dependency-name: 'eslint'
-        update-types:
-          - 'version-update:semver-major'

eslint.config.js

@@ -0,0 +1,62 @@
+/* eslint-disable import/no-named-as-default-member */
+
+import js from '@eslint/js';
+import prettier from 'eslint-config-prettier';
+import importPlugin from 'eslint-plugin-import';
+import simpleImportSort from 'eslint-plugin-simple-import-sort';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default [
+  {
+    ignores: [
+      '.git/*',
+      '.vscode/*',
+      'coverage/*',
+      'dist/*',
+      'node_modules/*',
+      'playwright-report/*',
+    ],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  ...tseslint.configs.stylistic,
+  importPlugin.flatConfigs.recommended,
+  importPlugin.flatConfigs.typescript,
+  prettier,
+  {
+    files: ['**/*.{js,mjs,cjs,ts,cts,mts}'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.es2021,
+      },
+    },
+    plugins: { 'simple-import-sort': simpleImportSort },
+    settings: {
+      'import/resolver': {
+        typescript: {
+          project: 'tsconfig.json',
+        },
+      },
+    },
+    rules: {
+      'no-warning-comments': ['warn', { terms: ['todo', 'fixme', '@@@'] }],
+      'simple-import-sort/imports': 'warn',
+      'simple-import-sort/exports': 'warn',
+      'import/first': 'warn',
+      'import/newline-after-import': 'warn',
+      'import/no-duplicates': ['error', { 'prefer-inline': true }],
+      'import/order': 'off',
+    },
+  },
+  {
+    files: ['src/**/*.{js,mjs,cjs,ts,cts,mts}'],
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.es2021,
+      },
+    },
+  },
+];

package.json

@@ -86,22 +86,23 @@
     "prepack": "npm run build"
   },
   "devDependencies": {
+    "@eslint/js": "^9.12.0",
     "@playwright/test": "1.33.0",
+    "@types/eslint__js": "^8.42.3",
+    "@types/eslint-config-prettier": "^6.11.3",
     "@types/node": "*",
-    "@typescript-eslint/eslint-plugin": "^8.8.0",
-    "@typescript-eslint/parser": "^8.8.0",
     "esbuild": "^0.24.0",
-    "eslint": "^8.57.1",
+    "eslint": "^9.12.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-import-resolver-typescript": "^3.6.3",
-    "eslint-plugin-import": "^2.30.0",
+    "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-simple-import-sort": "^12.1.1",
     "husky": "^9.1.6",
     "lint-staged": "^15.2.10",
     "npm-run-all": "^4.1.5",
     "prettier": "3.3.3",
-    "ts-node": "^10.9.2",
-    "typescript": "^5.6.2"
+    "typescript": "^5.6.2",
+    "typescript-eslint": "^8.8.1"
   },
   "lint-staged": {
     "*.{js,ts}": [

src/popover-helpers.ts

@@ -84,7 +84,6 @@ function topMostAutoPopover(document: Document): HTMLElement | null {
   const documentPopovers = autoPopoverList.get(document);
   for (const popover of documentPopovers || []) {
     if (!popover.isConnected) {
-      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
       documentPopovers!.delete(popover);
     } else {
       return popover;
@@ -285,14 +284,12 @@ export function showPopover(element: HTMLElement) {
   if (!topLayerElements.has(document)) {
     topLayerElements.set(document, new Set());
   }
-  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
   topLayerElements.get(document)!.add(element);
   popoverFocusingSteps(element);
   if (element.popover === 'auto') {
     if (!autoPopoverList.has(document)) {
       autoPopoverList.set(document, new Set());
     }
-    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
     autoPopoverList.get(document)!.add(element);
     setInvokerAriaExpanded(popoverInvoker.get(element), true);
   }