From 2eb7c3bdc949eaaa1c31efbe211ca21175da780b Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 00:23:37 +0800
Subject: [PATCH 01/20] add setting

---
 packages/sv/src/addons/eslint.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/sv/src/addons/eslint.ts b/packages/sv/src/addons/eslint.ts
index 05b667676..df6ab9311 100644
--- a/packages/sv/src/addons/eslint.ts
+++ b/packages/sv/src/addons/eslint.ts
@@ -55,7 +55,7 @@ export default defineAddon({
 				eslintConfigs.push(jsConfig);
 
 				if (typescript) {
-					const tsConfig = js.common.parseExpression('ts.configs.recommended');
+					const tsConfig = js.common.parseExpression('ts.configs.recommendedTypeChecked');
 					eslintConfigs.push(tsConfig);
 				}
 
@@ -84,6 +84,7 @@ export default defineAddon({
 
 				const globalsConfig = js.object.create({
 					languageOptions: {
+						parserOptions: typescript ? { projectService: true } : undefined,
 						globals: globalsObjLiteral
 					},
 					rules: typescript ? rules : undefined

From 15112160f178bfce794adbe0d541de85d68ce3e9 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 00:23:42 +0800
Subject: [PATCH 02/20] snapshot

---
 .../snapshots/create-with-all-addons/eslint.config.js      | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
index e46c5b535..d2294e1a0 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
@@ -11,12 +11,15 @@ const gitignorePath = path.resolve(import.meta.dirname, '.gitignore');
 export default defineConfig(
 	includeIgnoreFile(gitignorePath),
 	js.configs.recommended,
-	ts.configs.recommended,
+	ts.configs.recommendedTypeChecked,
 	svelte.configs.recommended,
 	prettier,
 	svelte.configs.prettier,
 	{
-		languageOptions: { globals: { ...globals.browser, ...globals.node } },
+		languageOptions: {
+			parserOptions: { projectService: true },
+			globals: { ...globals.browser, ...globals.node }
+		},
 		rules: {
 			// typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
 			// see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors

From 2f482e7f1a2308a81776a7584fa7602a96035094 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 04:55:40 +0800
Subject: [PATCH 03/20] changes

---
 packages/sv/src/addons/better-auth.ts                  | 10 +++++-----
 packages/sv/src/addons/drizzle.ts                      |  2 +-
 packages/sv/src/addons/eslint.ts                       |  4 +++-
 packages/sv/src/addons/vitest-addon.ts                 |  4 ++--
 .../sv/src/create/shared/+typescript/tsconfig.json     |  3 ++-
 .../create/templates/demo/src/routes/+layout.svelte    |  3 ++-
 .../templates/demo/src/routes/sverdle/+page.server.ts  |  4 ++--
 .../templates/demo/src/routes/sverdle/+page.svelte     |  4 ++--
 8 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/packages/sv/src/addons/better-auth.ts b/packages/sv/src/addons/better-auth.ts
index ea1910e24..674469268 100644
--- a/packages/sv/src/addons/better-auth.ts
+++ b/packages/sv/src/addons/better-auth.ts
@@ -342,8 +342,8 @@ export default defineAddon({
 						? `
 						signInEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = formData.get('email')?.toString() ?? '';
-							const password = formData.get('password')?.toString() ?? '';
+							const email = (formData.get('email') as string) ?? '';
+							const password = (formData.get('password') as string) ?? '';
 
 							try {
 								await auth.api.signInEmail({
@@ -364,9 +364,9 @@ export default defineAddon({
 						},
 						signUpEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = formData.get('email')?.toString() ?? '';
-							const password = formData.get('password')?.toString() ?? '';
-							const name = formData.get('name')?.toString() ?? '';
+							const email = (formData.get('email') as string) ?? '';
+							const password = (formData.get('password') as string) ?? '';
+							const name = (formData.get('name') as string) ?? '';
 
 							try {
 								await auth.api.signUpEmail({
diff --git a/packages/sv/src/addons/drizzle.ts b/packages/sv/src/addons/drizzle.ts
index f064b0bac..3b77c0756 100644
--- a/packages/sv/src/addons/drizzle.ts
+++ b/packages/sv/src/addons/drizzle.ts
@@ -322,7 +322,7 @@ export default defineAddon({
 				override({
 					typescript: {
 						config: js.common.parseExpression(
-							`(config) => { config.include.push('../drizzle.config.${language}')}`
+							`(config) => { (config.include as string[]).push('../drizzle.config.${language}')}`
 						)
 					}
 				});
diff --git a/packages/sv/src/addons/eslint.ts b/packages/sv/src/addons/eslint.ts
index df6ab9311..728bb1352 100644
--- a/packages/sv/src/addons/eslint.ts
+++ b/packages/sv/src/addons/eslint.ts
@@ -84,7 +84,9 @@ export default defineAddon({
 
 				const globalsConfig = js.object.create({
 					languageOptions: {
-						parserOptions: typescript ? { projectService: true } : undefined,
+						parserOptions: typescript
+							? { projectService: { allowDefaultProject: ['*.js'] } }
+							: undefined,
 						globals: globalsObjLiteral
 					},
 					rules: typescript ? rules : undefined
diff --git a/packages/sv/src/addons/vitest-addon.ts b/packages/sv/src/addons/vitest-addon.ts
index 9252d72a7..31620fb86 100644
--- a/packages/sv/src/addons/vitest-addon.ts
+++ b/packages/sv/src/addons/vitest-addon.ts
@@ -94,10 +94,10 @@ export default defineAddon({
 					if (content) return false;
 
 					return dedent`
-						<script>
+						<script${ts(' lang="ts"')}>
 							import { greet } from './greet';
 
-							let { host = 'SvelteKit', guest = 'Vitest' } = $props();
+							let { host = 'SvelteKit', guest = 'Vitest' }${ts(': { host: string; guest: string }')} = $props();
 						</script>
 
 						<h1>{greet(host)}</h1>
diff --git a/packages/sv/src/create/shared/+typescript/tsconfig.json b/packages/sv/src/create/shared/+typescript/tsconfig.json
index 2c2ed3c4d..709cb8322 100644
--- a/packages/sv/src/create/shared/+typescript/tsconfig.json
+++ b/packages/sv/src/create/shared/+typescript/tsconfig.json
@@ -10,7 +10,8 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"types": ["node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
diff --git a/packages/sv/src/create/templates/demo/src/routes/+layout.svelte b/packages/sv/src/create/templates/demo/src/routes/+layout.svelte
index 02ac943b0..a345e20db 100644
--- a/packages/sv/src/create/templates/demo/src/routes/+layout.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/+layout.svelte
@@ -1,9 +1,10 @@
 <script lang="ts">
 	import Header from './Header.svelte';
 	import './layout.css';
+	import type { LayoutProps } from './$types';
 
 	/** @type {{children: import('svelte').Snippet}} */
-	let { children } = $props();
+	let { children }: LayoutProps = $props();
 </script>
 
 <div class="app">
diff --git a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.server.ts b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.server.ts
index f20d00ca8..36f7d0ca5 100644
--- a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.server.ts
+++ b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.server.ts
@@ -35,7 +35,7 @@ export const actions = {
 		const game = new Game(cookies.get('sverdle'));
 
 		const data = await request.formData();
-		const key = data.get('key');
+		const key = (data.get('key') as string) ?? '';
 
 		const i = game.answers.length;
 
@@ -65,7 +65,7 @@ export const actions = {
 		cookies.set('sverdle', game.toString(), { path: '/' });
 	},
 
-	restart: async ({ cookies }) => {
+	restart: ({ cookies }) => {
 		cookies.delete('sverdle', { path: '/' });
 	}
 } satisfies Actions;
diff --git a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
index 8b2800fdd..9c89b0593 100644
--- a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
@@ -106,9 +106,9 @@
 	action="?/enter"
 	use:enhance={() => {
 		// prevent default callback from resetting the form
-		return ({ result, update }) => {
+		return async ({ result, update }) => {
 			shake = result.type === 'failure';
-			update({ reset: false });
+			await update({ reset: false });
 		};
 	}}
 >

From 35a21d1e54c3467d67fbfae9f5d91d1a940d73ab Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 04:57:48 +0800
Subject: [PATCH 04/20] snapshots

---
 .../src/routes/demo/better-auth/login/+page.server.ts  | 10 +++++-----
 .../tests/snapshots/create-experimental/tsconfig.json  |  1 +
 .../tests/snapshots/create-experimental/vite.config.ts |  2 +-
 .../src/cli/tests/snapshots/create-only/tsconfig.json  |  3 ++-
 .../snapshots/create-with-all-addons/eslint.config.js  |  2 +-
 .../src/lib/vitest-examples/Welcome.svelte             |  4 ++--
 .../src/routes/demo/better-auth/login/+page.server.ts  | 10 +++++-----
 .../snapshots/create-with-all-addons/tsconfig.json     |  3 ++-
 .../snapshots/create-with-all-addons/vite.config.ts    |  2 +-
 9 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts b/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts
index d97509ba9..7643c11b3 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts
@@ -14,8 +14,8 @@ export const load: PageServerLoad = (event) => {
 export const actions: Actions = {
 	signInEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = formData.get('email')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
+		const email = (formData.get('email') as string) ?? '';
+		const password = (formData.get('password') as string) ?? '';
 
 		try {
 			await auth.api.signInEmail({
@@ -36,9 +36,9 @@ export const actions: Actions = {
 	},
 	signUpEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = formData.get('email')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
-		const name = formData.get('name')?.toString() ?? '';
+		const email = (formData.get('email') as string) ?? '';
+		const password = (formData.get('password') as string) ?? '';
+		const name = (formData.get('name') as string) ?? '';
 
 		try {
 			await auth.api.signUpEmail({
diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
index 333f76845..0642ae6fe 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
@@ -12,6 +12,7 @@
 		"strict": true,
 		"moduleResolution": "bundler",
 		"types": [
+			"node",
 			"./worker-configuration.d.ts"
 		]
 	}
diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/vite.config.ts b/packages/sv/src/cli/tests/snapshots/create-experimental/vite.config.ts
index 2b5f79213..660efa77e 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/vite.config.ts
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/vite.config.ts
@@ -13,7 +13,7 @@ export default defineConfig({
 			experimental: { explicitEnvironmentVariables: true },
 			typescript: {
 				config: (config) => {
-					config.include.push('../drizzle.config.ts');
+					(config.include as string[]).push('../drizzle.config.ts');
 				}
 			}
 		})
diff --git a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
index 2c2ed3c4d..709cb8322 100644
--- a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
@@ -10,7 +10,8 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"types": ["node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
index d2294e1a0..6cd9d5f90 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
@@ -17,7 +17,7 @@ export default defineConfig(
 	svelte.configs.prettier,
 	{
 		languageOptions: {
-			parserOptions: { projectService: true },
+			parserOptions: { projectService: { allowDefaultProject: ['*.js'] } },
 			globals: { ...globals.browser, ...globals.node }
 		},
 		rules: {
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/lib/vitest-examples/Welcome.svelte b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/lib/vitest-examples/Welcome.svelte
index c7b846031..e8f7c31c5 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/lib/vitest-examples/Welcome.svelte
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/lib/vitest-examples/Welcome.svelte
@@ -1,7 +1,7 @@
-<script>
+<script lang="ts">
 	import { greet } from './greet';
 
-	let { host = 'SvelteKit', guest = 'Vitest' } = $props();
+	let { host = 'SvelteKit', guest = 'Vitest' }: { host: string; guest: string } = $props();
 </script>
 
 <h1>{greet(host)}</h1>
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts
index d97509ba9..7643c11b3 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts
@@ -14,8 +14,8 @@ export const load: PageServerLoad = (event) => {
 export const actions: Actions = {
 	signInEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = formData.get('email')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
+		const email = (formData.get('email') as string) ?? '';
+		const password = (formData.get('password') as string) ?? '';
 
 		try {
 			await auth.api.signInEmail({
@@ -36,9 +36,9 @@ export const actions: Actions = {
 	},
 	signUpEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = formData.get('email')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
-		const name = formData.get('name')?.toString() ?? '';
+		const email = (formData.get('email') as string) ?? '';
+		const password = (formData.get('password') as string) ?? '';
+		const name = (formData.get('name') as string) ?? '';
 
 		try {
 			await auth.api.signUpEmail({
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
index 2c2ed3c4d..709cb8322 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
@@ -10,7 +10,8 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"types": ["node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/vite.config.ts b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/vite.config.ts
index 192c372b3..877f9b329 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/vite.config.ts
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/vite.config.ts
@@ -19,7 +19,7 @@ export default defineConfig({
 			extensions: ['.svelte', '.svx', '.md'],
 			typescript: {
 				config: (config) => {
-					config.include.push('../drizzle.config.ts');
+					(config.include as string[]).push('../drizzle.config.ts');
 				}
 			}
 		}),

From 5f300f9731718fe8acb0646a49dbc57ee8faa70c Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 05:11:04 +0800
Subject: [PATCH 05/20] fix

---
 packages/sv/src/addons/drizzle.ts                       | 2 +-
 packages/sv/src/create/shared/+typescript/tsconfig.json | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/sv/src/addons/drizzle.ts b/packages/sv/src/addons/drizzle.ts
index 3b77c0756..578da2b76 100644
--- a/packages/sv/src/addons/drizzle.ts
+++ b/packages/sv/src/addons/drizzle.ts
@@ -322,7 +322,7 @@ export default defineAddon({
 				override({
 					typescript: {
 						config: js.common.parseExpression(
-							`(config) => { (config.include as string[]).push('../drizzle.config.${language}')}`
+							`(config) => { (config.include${ts(' as string[]')}).push('../drizzle.config.${language}')}`
 						)
 					}
 				});
diff --git a/packages/sv/src/create/shared/+typescript/tsconfig.json b/packages/sv/src/create/shared/+typescript/tsconfig.json
index 709cb8322..82310a5e5 100644
--- a/packages/sv/src/create/shared/+typescript/tsconfig.json
+++ b/packages/sv/src/create/shared/+typescript/tsconfig.json
@@ -11,7 +11,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["node"]
+		"types": ["$app/types", "node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files

From 44fa5097f1d3b36b3046a4dea6253ab17aadeba1 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 05:15:22 +0800
Subject: [PATCH 06/20] snapshots

---
 .../src/cli/tests/snapshots/create-experimental/tsconfig.json   | 1 +
 packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json   | 2 +-
 .../cli/tests/snapshots/create-with-all-addons/tsconfig.json    | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
index 0642ae6fe..d6763e2a6 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
@@ -12,6 +12,7 @@
 		"strict": true,
 		"moduleResolution": "bundler",
 		"types": [
+			"$app/types",
 			"node",
 			"./worker-configuration.d.ts"
 		]
diff --git a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
index 709cb8322..82310a5e5 100644
--- a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
@@ -11,7 +11,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["node"]
+		"types": ["$app/types", "node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
index 709cb8322..82310a5e5 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
@@ -11,7 +11,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["node"]
+		"types": ["$app/types", "node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files

From ee385e8d64c696287658c94f143fedaa2ca1b581 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 05:39:45 +0800
Subject: [PATCH 07/20] fix

---
 packages/sv/src/addons/better-auth.ts                  | 10 +++++-----
 .../tests/snapshots/create-experimental/tsconfig.json  |  1 -
 .../src/cli/tests/snapshots/create-only/tsconfig.json  |  2 +-
 .../snapshots/create-with-all-addons/tsconfig.json     |  2 +-
 .../sv/src/create/shared/+typescript/tsconfig.json     |  2 +-
 5 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/packages/sv/src/addons/better-auth.ts b/packages/sv/src/addons/better-auth.ts
index 674469268..3d55fcfdf 100644
--- a/packages/sv/src/addons/better-auth.ts
+++ b/packages/sv/src/addons/better-auth.ts
@@ -342,8 +342,8 @@ export default defineAddon({
 						? `
 						signInEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = (formData.get('email') as string) ?? '';
-							const password = (formData.get('password') as string) ?? '';
+							const email = formData.get('email')${ts(' as string')} ?? '';
+							const password = formData.get('password')${ts(' as string')} ?? '';
 
 							try {
 								await auth.api.signInEmail({
@@ -364,9 +364,9 @@ export default defineAddon({
 						},
 						signUpEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = (formData.get('email') as string) ?? '';
-							const password = (formData.get('password') as string) ?? '';
-							const name = (formData.get('name') as string) ?? '';
+							const email = formData.get('email')${ts(' as string')} ?? '';
+							const password = formData.get('password')${ts(' as string')} ?? '';
+							const name = formData.get('name')${ts(' as string')} ?? '';
 
 							try {
 								await auth.api.signUpEmail({
diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
index d6763e2a6..0642ae6fe 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/tsconfig.json
@@ -12,7 +12,6 @@
 		"strict": true,
 		"moduleResolution": "bundler",
 		"types": [
-			"$app/types",
 			"node",
 			"./worker-configuration.d.ts"
 		]
diff --git a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
index 82310a5e5..709cb8322 100644
--- a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
@@ -11,7 +11,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["$app/types", "node"]
+		"types": ["node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
index 82310a5e5..709cb8322 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
@@ -11,7 +11,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["$app/types", "node"]
+		"types": ["node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
diff --git a/packages/sv/src/create/shared/+typescript/tsconfig.json b/packages/sv/src/create/shared/+typescript/tsconfig.json
index 82310a5e5..709cb8322 100644
--- a/packages/sv/src/create/shared/+typescript/tsconfig.json
+++ b/packages/sv/src/create/shared/+typescript/tsconfig.json
@@ -11,7 +11,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"moduleResolution": "bundler",
-		"types": ["$app/types", "node"]
+		"types": ["node"]
 	}
 	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
 	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files

From f9d34afcfc8f4a4a7b8a824c1dfd16ff30cb687d Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 05:55:44 +0800
Subject: [PATCH 08/20] fix better-auth

---
 packages/sv/src/addons/better-auth.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/sv/src/addons/better-auth.ts b/packages/sv/src/addons/better-auth.ts
index 3d55fcfdf..2adaf003c 100644
--- a/packages/sv/src/addons/better-auth.ts
+++ b/packages/sv/src/addons/better-auth.ts
@@ -342,8 +342,8 @@ export default defineAddon({
 						? `
 						signInEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = formData.get('email')${ts(' as string')} ?? '';
-							const password = formData.get('password')${ts(' as string')} ?? '';
+							const email = (formData.get('email')${ts(' as string')}) ?? '';
+							const password = (formData.get('password')${ts(' as string')}) ?? '';
 
 							try {
 								await auth.api.signInEmail({
@@ -364,9 +364,9 @@ export default defineAddon({
 						},
 						signUpEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = formData.get('email')${ts(' as string')} ?? '';
-							const password = formData.get('password')${ts(' as string')} ?? '';
-							const name = formData.get('name')${ts(' as string')} ?? '';
+							const email = (formData.get('email')${ts(' as string')}) ?? '';
+							const password = (formData.get('password')${ts(' as string')}) ?? '';
+							const name = (formData.get('name')${ts(' as string')}) ?? '';
 
 							try {
 								await auth.api.signUpEmail({

From 722c80c9d97b52672a3c64e44c708d10dc33153d Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 06:20:11 +0800
Subject: [PATCH 09/20] fix layout types

---
 .../sv/src/create/templates/minimal/src/routes/+layout.svelte | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/sv/src/create/templates/minimal/src/routes/+layout.svelte b/packages/sv/src/create/templates/minimal/src/routes/+layout.svelte
index 9cebde545..891a4ef3d 100644
--- a/packages/sv/src/create/templates/minimal/src/routes/+layout.svelte
+++ b/packages/sv/src/create/templates/minimal/src/routes/+layout.svelte
@@ -1,7 +1,9 @@
 <script lang="ts">
 	import favicon from '$lib/assets/favicon.svg';
+	import type { LayoutProps } from './$types';
 
-	let { children } = $props();
+	/** @type {{children: import('svelte').Snippet}} */
+	let { children }: LayoutProps = $props();
 </script>
 
 <svelte:head>

From 9b892e4eaceb3d17312f7bad0014aab1332a468f Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 06:30:47 +0800
Subject: [PATCH 10/20] snapshots

---
 .../snapshots/create-experimental/src/routes/+layout.svelte    | 3 ++-
 .../cli/tests/snapshots/create-only/src/routes/+layout.svelte  | 3 ++-
 .../snapshots/create-with-all-addons/src/routes/+layout.svelte | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/+layout.svelte b/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/+layout.svelte
index 9cebde545..dbf8844ff 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/+layout.svelte
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/+layout.svelte
@@ -1,7 +1,8 @@
 <script lang="ts">
 	import favicon from '$lib/assets/favicon.svg';
+	import type { LayoutProps } from './$types';
 
-	let { children } = $props();
+	let { children }: LayoutProps = $props();
 </script>
 
 <svelte:head>
diff --git a/packages/sv/src/cli/tests/snapshots/create-only/src/routes/+layout.svelte b/packages/sv/src/cli/tests/snapshots/create-only/src/routes/+layout.svelte
index 9cebde545..dbf8844ff 100644
--- a/packages/sv/src/cli/tests/snapshots/create-only/src/routes/+layout.svelte
+++ b/packages/sv/src/cli/tests/snapshots/create-only/src/routes/+layout.svelte
@@ -1,7 +1,8 @@
 <script lang="ts">
 	import favicon from '$lib/assets/favicon.svg';
+	import type { LayoutProps } from './$types';
 
-	let { children } = $props();
+	let { children }: LayoutProps = $props();
 </script>
 
 <svelte:head>
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/+layout.svelte b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/+layout.svelte
index 70b0cbf40..aa061e956 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/+layout.svelte
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/+layout.svelte
@@ -5,8 +5,9 @@
 	import { locales, localizeHref } from '$lib/paraglide/runtime';
 	import './layout.css';
 	import favicon from '$lib/assets/favicon.svg';
+	import type { LayoutProps } from './$types';
 
-	let { children } = $props();
+	let { children }: LayoutProps = $props();
 </script>
 
 <svelte:head><link rel="icon" href={favicon} /></svelte:head>

From 2b2f17ad031745f53e8d32337969c770e1a0e399 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Fri, 31 Jul 2026 10:02:58 +0800
Subject: [PATCH 11/20] fix

---
 CONTRIBUTING.md                                                | 3 +--
 packages/sv/src/addons/experimental.ts                         | 2 ++
 .../sv/src/create/shared/+library+typescript/tsconfig.json     | 3 ++-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 77b7e0786..d6dfcea73 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -112,8 +112,7 @@ Some snapshots are testing the output of `sv` directly from the generated binary
 In one command:
 
 ```sh
-pnpm build && pnpm test:ui --project cli
-# Press `u` when prompted to update snapshots.
+pnpm build && pnpm test --project cli -u all
 ```
 
 ## Style Guide
diff --git a/packages/sv/src/addons/experimental.ts b/packages/sv/src/addons/experimental.ts
index 9cef4ad0e..0ba28148e 100644
--- a/packages/sv/src/addons/experimental.ts
+++ b/packages/sv/src/addons/experimental.ts
@@ -89,6 +89,8 @@ export default defineAddon({
 						data.extends = KIT3_TSCONFIG;
 						data.include ??= [directory.src];
 						for (const [key, value] of Object.entries(data.compilerOptions ?? {})) {
+							if (key === 'types' && Array.isArray(value) && !value.includes('$app/types'))
+								value.push('$app/types');
 							// a differing value is a deliberate override and stays
 							if (KIT3_TSCONFIG_DEFAULT[key] === value) delete data.compilerOptions[key];
 						}
diff --git a/packages/sv/src/create/shared/+library+typescript/tsconfig.json b/packages/sv/src/create/shared/+library+typescript/tsconfig.json
index e7c4a9a69..99a690926 100644
--- a/packages/sv/src/create/shared/+library+typescript/tsconfig.json
+++ b/packages/sv/src/create/shared/+library+typescript/tsconfig.json
@@ -10,6 +10,7 @@
 		"sourceMap": true,
 		"strict": true,
 		"module": "NodeNext",
-		"moduleResolution": "NodeNext"
+		"moduleResolution": "NodeNext",
+		"types": ["node"]
 	}
 }

From d0f2163de79cbc5c4ea4e6f4fe80fd4912dfd518 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sat, 1 Aug 2026 09:24:45 +0800
Subject: [PATCH 12/20] more robust validator

---
 packages/sv/src/addons/better-auth.ts           | 17 ++++++++++-------
 .../demo/better-auth/login/+page.server.ts      | 17 ++++++++++-------
 .../demo/better-auth/login/+page.server.ts      | 17 ++++++++++-------
 3 files changed, 30 insertions(+), 21 deletions(-)

diff --git a/packages/sv/src/addons/better-auth.ts b/packages/sv/src/addons/better-auth.ts
index 2adaf003c..d643ae82b 100644
--- a/packages/sv/src/addons/better-auth.ts
+++ b/packages/sv/src/addons/better-auth.ts
@@ -342,8 +342,8 @@ export default defineAddon({
 						? `
 						signInEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = (formData.get('email')${ts(' as string')}) ?? '';
-							const password = (formData.get('password')${ts(' as string')}) ?? '';
+							const email = parseEntry(formData.get('email'));
+							const password = parseEntry(formData.get('password'));
 
 							try {
 								await auth.api.signInEmail({
@@ -364,9 +364,9 @@ export default defineAddon({
 						},
 						signUpEmail: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const email = (formData.get('email')${ts(' as string')}) ?? '';
-							const password = (formData.get('password')${ts(' as string')}) ?? '';
-							const name = (formData.get('name')${ts(' as string')}) ?? '';
+							const email = parseEntry(formData.get('email'));
+							const password = parseEntry(formData.get('password'));
+							const name = parseEntry(formData.get('name'));
 
 							try {
 								await auth.api.signUpEmail({
@@ -392,8 +392,8 @@ export default defineAddon({
 						? `
 						signInSocial: async (event) => {${d1AuthLine}
 							const formData = await event.request.formData();
-							const provider = formData.get('provider')?.toString() ?? 'github';
-							const callbackURL = formData.get('callbackURL')?.toString() ?? '/demo/better-auth';
+							const provider = parseEntry(formData.get('provider')) || 'github';
+							const callbackURL = parseEntry(formData.get('callbackURL')) || '/demo/better-auth';
 
 							const result = await auth.api.signInSocial({
 								body: {
@@ -418,6 +418,9 @@ export default defineAddon({
 					${!d1 ? `import { auth } from '${lib}/server/auth';` : ''}
 					${needsAPIError ? "import { APIError } from 'better-auth/api';" : ''}
 
+					const parseEntry = (input${ts(' : FormDataEntryValue | null')}): string =>
+						input instanceof File ? input.name : (input ?? '');
+
 					export const load${ts(': PageServerLoad')} = (event) => {
 						if (event.locals.user) {
 							return redirect(302, '/demo/better-auth');
diff --git a/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts b/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts
index 7643c11b3..b0bbce4b4 100644
--- a/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts
+++ b/packages/sv/src/cli/tests/snapshots/create-experimental/src/routes/demo/better-auth/login/+page.server.ts
@@ -4,6 +4,9 @@ import type { PageServerLoad } from './$types';
 import { auth } from '$lib/server/auth';
 import { APIError } from 'better-auth/api';
 
+const parseEntry = (input : FormDataEntryValue | null): string =>
+	input instanceof File ? input.name : (input ?? '');
+
 export const load: PageServerLoad = (event) => {
 	if (event.locals.user) {
 		return redirect(302, '/demo/better-auth');
@@ -14,8 +17,8 @@ export const load: PageServerLoad = (event) => {
 export const actions: Actions = {
 	signInEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = (formData.get('email') as string) ?? '';
-		const password = (formData.get('password') as string) ?? '';
+		const email = parseEntry(formData.get('email'));
+		const password = parseEntry(formData.get('password'));
 
 		try {
 			await auth.api.signInEmail({
@@ -36,9 +39,9 @@ export const actions: Actions = {
 	},
 	signUpEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = (formData.get('email') as string) ?? '';
-		const password = (formData.get('password') as string) ?? '';
-		const name = (formData.get('name') as string) ?? '';
+		const email = parseEntry(formData.get('email'));
+		const password = parseEntry(formData.get('password'));
+		const name = parseEntry(formData.get('name'));
 
 		try {
 			await auth.api.signUpEmail({
@@ -60,8 +63,8 @@ export const actions: Actions = {
 	},
 	signInSocial: async (event) => {
 		const formData = await event.request.formData();
-		const provider = formData.get('provider')?.toString() ?? 'github';
-		const callbackURL = formData.get('callbackURL')?.toString() ?? '/demo/better-auth';
+		const provider = parseEntry(formData.get('provider')) || 'github';
+		const callbackURL = parseEntry(formData.get('callbackURL')) || '/demo/better-auth';
 
 		const result = await auth.api.signInSocial({
 			body: {
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts
index 7643c11b3..b0bbce4b4 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/src/routes/demo/better-auth/login/+page.server.ts
@@ -4,6 +4,9 @@ import type { PageServerLoad } from './$types';
 import { auth } from '$lib/server/auth';
 import { APIError } from 'better-auth/api';
 
+const parseEntry = (input : FormDataEntryValue | null): string =>
+	input instanceof File ? input.name : (input ?? '');
+
 export const load: PageServerLoad = (event) => {
 	if (event.locals.user) {
 		return redirect(302, '/demo/better-auth');
@@ -14,8 +17,8 @@ export const load: PageServerLoad = (event) => {
 export const actions: Actions = {
 	signInEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = (formData.get('email') as string) ?? '';
-		const password = (formData.get('password') as string) ?? '';
+		const email = parseEntry(formData.get('email'));
+		const password = parseEntry(formData.get('password'));
 
 		try {
 			await auth.api.signInEmail({
@@ -36,9 +39,9 @@ export const actions: Actions = {
 	},
 	signUpEmail: async (event) => {
 		const formData = await event.request.formData();
-		const email = (formData.get('email') as string) ?? '';
-		const password = (formData.get('password') as string) ?? '';
-		const name = (formData.get('name') as string) ?? '';
+		const email = parseEntry(formData.get('email'));
+		const password = parseEntry(formData.get('password'));
+		const name = parseEntry(formData.get('name'));
 
 		try {
 			await auth.api.signUpEmail({
@@ -60,8 +63,8 @@ export const actions: Actions = {
 	},
 	signInSocial: async (event) => {
 		const formData = await event.request.formData();
-		const provider = formData.get('provider')?.toString() ?? 'github';
-		const callbackURL = formData.get('callbackURL')?.toString() ?? '/demo/better-auth';
+		const provider = parseEntry(formData.get('provider')) || 'github';
+		const callbackURL = parseEntry(formData.get('callbackURL')) || '/demo/better-auth';
 
 		const result = await auth.api.signInSocial({
 			body: {

From 0400071ee2fe4cddd67436d5e099127ca24b42b0 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sat, 1 Aug 2026 13:18:19 +0800
Subject: [PATCH 13/20] void makes more sense

---
 .../src/create/templates/demo/src/routes/sverdle/+page.svelte | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
index 9c89b0593..a911d4a64 100644
--- a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
@@ -106,9 +106,9 @@
 	action="?/enter"
 	use:enhance={() => {
 		// prevent default callback from resetting the form
-		return async ({ result, update }) => {
+		return ({ result, update }) => {
 			shake = result.type === 'failure';
-			await update({ reset: false });
+			void update({ reset: false });
 		};
 	}}
 >

From 380ef58afb8c651c37531eccd51ecc5a76abe3a3 Mon Sep 17 00:00:00 2001
From: Manuel Serret <mserret99@gmail.com>
Date: Fri, 7 Aug 2026 09:50:45 +0200
Subject: [PATCH 14/20] fix

---
 packages/sv/src/core/formatFiles.ts | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/packages/sv/src/core/formatFiles.ts b/packages/sv/src/core/formatFiles.ts
index 80a47aa1d..f9da492ab 100644
--- a/packages/sv/src/core/formatFiles.ts
+++ b/packages/sv/src/core/formatFiles.ts
@@ -97,22 +97,3 @@ async function run(
 		return { error: message || (e instanceof Error ? e.message : 'unknown error') };
 	}
 }
-
-async function run(
-	command: string,
-	args: string[],
-	cwd: string
-): Promise<{ error?: string; notFound?: boolean }> {
-	try {
-		await exec(command, args, { nodeOptions: { cwd, stdio: 'pipe' }, throwOnError: true });
-		return {};
-	} catch (e) {
-		// @ts-expect-error tinyexec rethrows the spawn error as-is
-		if (e?.code === 'ENOENT') return { notFound: true, error: `${command} not found` };
-		// @ts-expect-error `output` is only present on tinyexec's `NonZeroExitError`
-		const output = e?.output as { stderr?: string; stdout?: string } | undefined;
-		// failures can land on either stream, so report both
-		const message = [output?.stderr, output?.stdout].filter(Boolean).join('\n').trim();
-		return { error: message || (e instanceof Error ? e.message : 'unknown error') };
-	}
-}

From 5895579523652943e7195c118cbb18329560e3a6 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sun, 4 Oct 2026 01:10:31 +0800
Subject: [PATCH 15/20] .

---
 packages/sv-utils/CHANGELOG.md                     | 12 ++++++------
 packages/sv-utils/src/index.ts                     |  9 +++++++++
 packages/sv/CHANGELOG.md                           | 14 +++++++-------
 .../shared/+library+typescript/tsconfig.json       |  3 +--
 .../sv/src/create/shared/+typescript/tsconfig.json |  3 +--
 .../templates/demo/src/routes/+layout.svelte       |  1 -
 6 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/packages/sv-utils/CHANGELOG.md b/packages/sv-utils/CHANGELOG.md
index 8f4f1ec88..473278b35 100644
--- a/packages/sv-utils/CHANGELOG.md
+++ b/packages/sv-utils/CHANGELOG.md
@@ -13,7 +13,7 @@
 - feat: allow `js.function.call` to accept AST expression nodes as arguments ([#1232](https://github.com/sveltejs/cli/pull/1232))
 
 - fix(sv-utils): detect pnpm version from the target project, and update `pnpm.allowBuilds` signature. ([#1320](https://github.com/sveltejs/cli/pull/1320))
-
+  
   ```diff
   -pnpm.allowBuilds('sharp')
   +pnpm.allowBuilds({ cwd, packages: ['sharp'] })
@@ -49,7 +49,7 @@
 ### Minor Changes
 
 - fix(sv-utils): detect pnpm version from the target project, and update `pnpm.allowBuilds` signature. ([#1320](https://github.com/sveltejs/cli/pull/1320))
-
+  
   ```diff
   -pnpm.allowBuilds('sharp')
   +pnpm.allowBuilds({ cwd, packages: ['sharp'] })
@@ -181,16 +181,16 @@
 
 
 - feat: decouple sv / sv-utils, explicit public API, deprecation pass ([#1046](https://github.com/sveltejs/cli/pull/1046))
-
+  
   **`@sveltejs/sv-utils`**
-
+  
   - Rename file helpers: `readFile` -> `loadFile`, `writeFile` -> `saveFile`, `getPackageJson` -> `loadPackageJson`
   - Add `pnpm.onlyBuiltDependencies()` transform for `pnpm-workspace.yaml`
   - Export `YamlDocument` type from parsers
   - Remove `commonFilePaths`, `installPackages` (moved internal to `sv`)
-
+  
   **`sv`**
-
+  
   - `create()` signature changed to `create({ cwd, ...options })`. The old `create(cwd, options)` is deprecated and will be removed in the next major release.
   - `sv.pnpmBuildDependency()` is deprecated and will be removed in the next major release. Use `sv.file()` with `pnpm.onlyBuiltDependencies()` from `@sveltejs/sv-utils` instead.
   - `workspace.file.prettierignore`, `.prettierrc`, `.eslintConfig`, `.vscodeSettings`, `.vscodeExtensions` are deprecated and will be removed in the next major release. Use the raw strings directly (e.g. `'.prettierignore'`).
diff --git a/packages/sv-utils/src/index.ts b/packages/sv-utils/src/index.ts
index c673ce654..b372b1249 100644
--- a/packages/sv-utils/src/index.ts
+++ b/packages/sv-utils/src/index.ts
@@ -37,5 +37,14 @@ export { defineDemoPage, type DemoPage } from './demo-page.ts';
 // Env access (abstracts over legacy `$env/dynamic/*` vs declared `$app/env/*` + `src/env.ts`)
 export { defineEnv } from './env.ts';
 
+// Kit 3 specifics (version detection, `$lib` -> `#lib`, the generated tsconfig)
+export {
+	KIT3_TSCONFIG,
+	KIT3_TSCONFIG_DEFAULT,
+	isKit3,
+	libSubpathImports,
+	resolveLibPrefix
+} from './kit3.ts';
+
 // Terminal styling
 export { color } from './color.ts';
diff --git a/packages/sv/CHANGELOG.md b/packages/sv/CHANGELOG.md
index dfb7fce3b..7266edb42 100644
--- a/packages/sv/CHANGELOG.md
+++ b/packages/sv/CHANGELOG.md
@@ -456,16 +456,16 @@
 
 
 - feat: decouple sv / sv-utils, explicit public API, deprecation pass ([#1046](https://github.com/sveltejs/cli/pull/1046))
-
+  
   **`@sveltejs/sv-utils`**
-
+  
   - Rename file helpers: `readFile` -> `loadFile`, `writeFile` -> `saveFile`, `getPackageJson` -> `loadPackageJson`
   - Add `pnpm.onlyBuiltDependencies()` transform for `pnpm-workspace.yaml`
   - Export `YamlDocument` type from parsers
   - Remove `commonFilePaths`, `installPackages` (moved internal to `sv`)
-
+  
   **`sv`**
-
+  
   - `create()` signature changed to `create({ cwd, ...options })`. The old `create(cwd, options)` is deprecated and will be removed in the next major release.
   - `sv.pnpmBuildDependency()` is deprecated and will be removed in the next major release. Use `sv.file()` with `pnpm.onlyBuiltDependencies()` from `@sveltejs/sv-utils` instead.
   - `workspace.file.prettierignore`, `.prettierrc`, `.eslintConfig`, `.vscodeSettings`, `.vscodeExtensions` are deprecated and will be removed in the next major release. Use the raw strings directly (e.g. `'.prettierignore'`).
@@ -877,7 +877,7 @@
 
 
 - feat(vitest): update to vitest `4.0` ([#760](https://github.com/sveltejs/cli/pull/760))
-
+  
   - removing `@vitest/browser` in favor of `@vitest/browser-playwright`
   - run browser tests in headless mode
 
@@ -1023,7 +1023,7 @@
 
 
 - feat(cli): rework preconditions: ([#650](https://github.com/sveltejs/cli/pull/650))
-
+  
   - remove `--no-preconditions` option from `sv add`
   - add `--no-git-check` option to `sv add`. With this flag, even if some files are dirty, no prompt will be shown
 
@@ -1046,7 +1046,7 @@
 
 
 - feat: improve minimal template ([#643](https://github.com/sveltejs/cli/pull/643))
-
+  
   - move `favicon.svg` to `src/lib/assets` folder (to show inline/immutable assets)
   - add `static/robots.txt` (to keep static folder)
   - add `routes/+layout.svelte` (to show layout)
diff --git a/packages/sv/src/create/shared/+library+typescript/tsconfig.json b/packages/sv/src/create/shared/+library+typescript/tsconfig.json
index 65077d6d1..62f2df920 100644
--- a/packages/sv/src/create/shared/+library+typescript/tsconfig.json
+++ b/packages/sv/src/create/shared/+library+typescript/tsconfig.json
@@ -1,8 +1,7 @@
 {
 	"extends": "$app/tsconfig",
 	"compilerOptions": {
-		"strict": true,
-		"types": ["node"]
+		"strict": true
 	},
 	"include": ["src", "vite.config.ts"]
 }
diff --git a/packages/sv/src/create/shared/+typescript/tsconfig.json b/packages/sv/src/create/shared/+typescript/tsconfig.json
index 65077d6d1..62f2df920 100644
--- a/packages/sv/src/create/shared/+typescript/tsconfig.json
+++ b/packages/sv/src/create/shared/+typescript/tsconfig.json
@@ -1,8 +1,7 @@
 {
 	"extends": "$app/tsconfig",
 	"compilerOptions": {
-		"strict": true,
-		"types": ["node"]
+		"strict": true
 	},
 	"include": ["src", "vite.config.ts"]
 }
diff --git a/packages/sv/src/create/templates/demo/src/routes/+layout.svelte b/packages/sv/src/create/templates/demo/src/routes/+layout.svelte
index 7ad953de2..228d69e38 100644
--- a/packages/sv/src/create/templates/demo/src/routes/+layout.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/+layout.svelte
@@ -2,7 +2,6 @@
 	import type { LayoutProps } from './$types';
 	import Header from './Header.svelte';
 	import './layout.css';
-	import type { LayoutProps } from './$types';
 
 	/** @type {{children: import('svelte').Snippet}} */
 	let { children }: LayoutProps = $props();

From b4314f099ec175584f08ff876fe434aade298990 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sun, 4 Oct 2026 01:14:05 +0800
Subject: [PATCH 16/20] .

---
 packages/sv/src/addons/eslint.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/packages/sv/src/addons/eslint.ts b/packages/sv/src/addons/eslint.ts
index 87bfe14c5..a4db484d4 100644
--- a/packages/sv/src/addons/eslint.ts
+++ b/packages/sv/src/addons/eslint.ts
@@ -83,11 +83,10 @@ export default defineAddon({
 						' see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors'
 				});
 
+				const tsOptions = { projectService: { allowDefaultProject: ['*.js'] } };
 				const globalsConfig = js.object.create({
 					languageOptions: {
-						parserOptions: typescript
-							? { projectService: { allowDefaultProject: ['*.js'] } }
-							: undefined,
+						parserOptions: typescript ? tsOptions : undefined,
 						globals: globalsObjLiteral
 					},
 					rules: typescript ? rules : undefined

From 9123830821f273a15890e1912f2061e92ade1086 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sun, 4 Oct 2026 01:19:49 +0800
Subject: [PATCH 17/20] .

---
 packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json  | 3 +--
 .../cli/tests/snapshots/create-with-all-addons/tsconfig.json   | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
index 65077d6d1..62f2df920 100644
--- a/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-only/tsconfig.json
@@ -1,8 +1,7 @@
 {
 	"extends": "$app/tsconfig",
 	"compilerOptions": {
-		"strict": true,
-		"types": ["node"]
+		"strict": true
 	},
 	"include": ["src", "vite.config.ts"]
 }
diff --git a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
index 2125d37b0..ea3a1cb6a 100644
--- a/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
+++ b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/tsconfig.json
@@ -1,8 +1,7 @@
 {
 	"extends": "$app/tsconfig",
 	"compilerOptions": {
-		"strict": true,
-		"types": ["node"]
+		"strict": true
 	},
 	"include": [
 		"src",

From 167cefe60793419c734dd8faa7be5115a083e055 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sun, 4 Oct 2026 01:57:20 +0800
Subject: [PATCH 18/20]

---
 .../create/templates/demo/src/routes/sverdle/+page.svelte  | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
index 46f3054f0..9ff6ee1d1 100644
--- a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
@@ -2,7 +2,7 @@
 	import { enhance } from '$app/forms';
 	import { resolve } from '$app/paths';
 	import { confetti } from '@neoconfetti/svelte';
-	import { MediaQuery } from 'svelte/reactivity';
+	import { prefersReducedMotion } from 'svelte/motion';
 	import type { PageProps } from './$types';
 
 	/**
@@ -10,9 +10,6 @@
 	 */
 	let { data }: PageProps = $props();
 
-	/** Whether the user prefers reduced motion */
-	const reducedMotion = new MediaQuery('(prefers-reduced-motion: reduce)');
-
 	let shake = $state(false);
 
 	/** Whether or not the user has won */
@@ -197,7 +194,7 @@
 	<div
 		style="position: absolute; left: 50%; top: 30%"
 		use:confetti={{
-			particleCount: reducedMotion.current ? 0 : undefined,
+			particleCount: prefersReducedMotion.current ? 0 : undefined,
 			force: 0.7,
 			stageWidth: window.innerWidth,
 			stageHeight: window.innerHeight,

From 4234f482e18b57da439663fe98235f218b9a42e0 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sun, 4 Oct 2026 01:58:57 +0800
Subject: [PATCH 19/20]

---
 .../src/create/templates/demo/src/routes/sverdle/+page.svelte | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
index 9ff6ee1d1..f883f132c 100644
--- a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
@@ -102,9 +102,9 @@
 	action="?/enter"
 	use:enhance={() => {
 		// prevent default callback from resetting the form
-		return ({ result, update }) => {
+		return async ({ result, update }) => {
 			shake = result.type === 'failure';
-			void update({ reset: false });
+			await update({ reset: false });
 		};
 	}}
 >

From c9141c89799bc9a0e2863d67f42cabc3b02a2ae5 Mon Sep 17 00:00:00 2001
From: Scott Wu <sw@scottwu.ca>
Date: Sun, 4 Oct 2026 03:37:01 +0800
Subject: [PATCH 20/20] removed unrelated code

---
 packages/sv/src/core/formatFiles.ts           | 19 ++++++++-----------
 .../demo/src/routes/sverdle/+page.svelte      |  7 +++++--
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/packages/sv/src/core/formatFiles.ts b/packages/sv/src/core/formatFiles.ts
index cad89299d..e14a56171 100644
--- a/packages/sv/src/core/formatFiles.ts
+++ b/packages/sv/src/core/formatFiles.ts
@@ -4,8 +4,7 @@ import * as p from '@clack/prompts';
 import { type AgentName, loadPackageJson, resolveCommand } from '@sveltejs/sv-utils';
 import * as resolve from 'empathic/resolve';
 import * as walk from 'empathic/walk';
-import { exec, NonZeroExitError } from 'tinyexec';
-import { isNodeError } from './common.js';
+import { exec } from 'tinyexec';
 import { detectPackageManager } from './package-manager.ts';
 import { findWorkspaceRoot } from './workspace.ts';
 
@@ -114,14 +113,12 @@ async function run(
 		await exec(command, args, { nodeOptions: { cwd, stdio: 'pipe' }, throwOnError: true });
 		return {};
 	} catch (e) {
-		if (e instanceof NonZeroExitError) {
-			// failures can land on either stream, so report both
-			const { stdout, stderr } = e.output ?? {};
-			const message = [stderr, stdout].filter(Boolean).join('\n').trim();
-			return { error: message };
-		}
-		if (!isNodeError(e)) return { error: 'unknown error' };
-		if (e.code === 'ENOENT') return { notFound: true, error: `${command} not found` };
-		return { error: e.message };
+		// @ts-expect-error tinyexec rethrows the spawn error as-is
+		if (e?.code === 'ENOENT') return { notFound: true, error: `${command} not found` };
+		// @ts-expect-error `output` is only present on tinyexec's `NonZeroExitError`
+		const output = e?.output as { stderr?: string; stdout?: string } | undefined;
+		// failures can land on either stream, so report both
+		const message = [output?.stderr, output?.stdout].filter(Boolean).join('\n').trim();
+		return { error: message || (e instanceof Error ? e.message : 'unknown error') };
 	}
 }
diff --git a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
index f883f132c..927ffe68a 100644
--- a/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
+++ b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
@@ -2,7 +2,7 @@
 	import { enhance } from '$app/forms';
 	import { resolve } from '$app/paths';
 	import { confetti } from '@neoconfetti/svelte';
-	import { prefersReducedMotion } from 'svelte/motion';
+	import { MediaQuery } from 'svelte/reactivity';
 	import type { PageProps } from './$types';
 
 	/**
@@ -10,6 +10,9 @@
 	 */
 	let { data }: PageProps = $props();
 
+	/** Whether the user prefers reduced motion */
+	const reducedMotion = new MediaQuery('(prefers-reduced-motion: reduce)');
+
 	let shake = $state(false);
 
 	/** Whether or not the user has won */
@@ -194,7 +197,7 @@
 	<div
 		style="position: absolute; left: 50%; top: 30%"
 		use:confetti={{
-			particleCount: prefersReducedMotion.current ? 0 : undefined,
+			particleCount: reducedMotion.current ? 0 : undefined,
 			force: 0.7,
 			stageWidth: window.innerWidth,
 			stageHeight: window.innerHeight,