diff --git a/packages/sv/src/addons/better-auth.ts b/packages/sv/src/addons/better-auth.ts
index db0e813fa..406e46130 100644
--- a/packages/sv/src/addons/better-auth.ts
+++ b/packages/sv/src/addons/better-auth.ts
@@ -354,8 +354,8 @@ const addon: Addon<AddonOptions<BetterAuthOptions>, 'better-auth'> = 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 = parseEntry(formData.get('email'));
+							const password = parseEntry(formData.get('password'));
 
 							try {
 								await auth.api.signInEmail({
@@ -376,9 +376,9 @@ const addon: Addon<AddonOptions<BetterAuthOptions>, 'better-auth'> = 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 = parseEntry(formData.get('email'));
+							const password = parseEntry(formData.get('password'));
+							const name = parseEntry(formData.get('name'));
 
 							try {
 								await auth.api.signUpEmail({
@@ -404,8 +404,8 @@ const addon: Addon<AddonOptions<BetterAuthOptions>, 'better-auth'> = 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: {
@@ -430,6 +430,9 @@ const addon: Addon<AddonOptions<BetterAuthOptions>, 'better-auth'> = defineAddon
 					${!d1 ? `import { auth } from '${lib}/server/auth.${language}';` : ''}
 					${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/addons/eslint.ts b/packages/sv/src/addons/eslint.ts
index 7f1b8b0ac..a4db484d4 100644
--- a/packages/sv/src/addons/eslint.ts
+++ b/packages/sv/src/addons/eslint.ts
@@ -56,7 +56,7 @@ 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);
 				}
 
@@ -83,8 +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 ? tsOptions : undefined,
 						globals: globalsObjLiteral
 					},
 					rules: typescript ? rules : undefined
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 babb9e0fe..72696a357 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.ts';
 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')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
+		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')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
-		const name = formData.get('name')?.toString() ?? '';
+		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/eslint.config.js b/packages/sv/src/cli/tests/snapshots/create-with-all-addons/eslint.config.js
index e46c5b535..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
@@ -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: { allowDefaultProject: ['*.js'] } },
+			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
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 babb9e0fe..72696a357 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.ts';
 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')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
+		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')?.toString() ?? '';
-		const password = formData.get('password')?.toString() ?? '';
-		const name = formData.get('name')?.toString() ?? '';
+		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/create/templates/demo/src/routes/sverdle/+page.svelte b/packages/sv/src/create/templates/demo/src/routes/sverdle/+page.svelte
index d38265b24..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
@@ -105,9 +105,9 @@
 	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 });
 		};
 	}}
 >