chore: upgrade eslint to v9 (#12098)

eslint.config.js

@@ -0,0 +1,20 @@
+import svelte_config from '@sveltejs/eslint-config';
+
+/** @type {import('eslint').Linter.FlatConfig[]} */
+export default [
+	...svelte_config,
+	{
+		rules: {
+			'no-undef': 'off'
+		}
+	},
+	{
+		ignores: [
+			'**/.svelte-kit',
+			'packages/adapter-static/test/apps/*/build',
+			'packages/adapter-cloudflare/files',
+			'packages/adapter-netlify/files',
+			'packages/adapter-node/files'
+		]
+	}
+];

package.json

@@ -22,14 +22,14 @@
 	},
 	"devDependencies": {
 		"@changesets/cli": "^2.27.1",
-		"@sveltejs/eslint-config": "^6.0.4",
+		"@sveltejs/eslint-config": "^7.0.1",
 		"@svitejs/changesets-changelog-github-compact": "^1.1.0",
-		"@typescript-eslint/eslint-plugin": "^7.0.0",
-		"eslint": "^8.56.0",
+		"eslint": "^9.0.0",
 		"eslint-config-prettier": "^9.1.0",
-		"eslint-plugin-svelte": "^2.35.1",
+		"eslint-plugin-svelte": "^2.36.0",
 		"eslint-plugin-unicorn": "^52.0.0",
-		"playwright": "^1.41.0"
+		"playwright": "^1.41.0",
+		"typescript-eslint": "^7.6.0"
 	},
 	"packageManager": "[email protected]",
 	"engines": {

packages/kit/test/apps/basics/test/client.test.js

@@ -717,10 +717,7 @@ test.describe('data-sveltekit attributes', () => {
 		expect(page).toHaveURL(offline_url);
 	});
 
-	test('data-sveltekit-preload does not abort ongoing navigation', async ({
-		page,
-		browserName
-	}) => {
+	test('data-sveltekit-preload does not abort ongoing navigation', async ({ page }) => {
 		await page.goto('/data-sveltekit/preload-data/offline');
 
 		await page.locator('#slow-navigation').dispatchEvent('click');
@@ -731,10 +728,7 @@ test.describe('data-sveltekit attributes', () => {
 			page.waitForLoadState('networkidle') // wait for preloading to finish
 		]);
 
-		expect(page).toHaveURL(
-			'/data-sveltekit/preload-data/offline/slow-navigation' ||
-				(browserName === 'chromium' && 'chrome-error://chromewebdata/')
-		);
+		expect(page).toHaveURL('/data-sveltekit/preload-data/offline/slow-navigation');
 	});
 
 	test('data-sveltekit-reload', async ({ baseURL, page, clicknav }) => {