Nextjs-Vite: Add Next.js 15 support

code/frameworks/experimental-nextjs-vite/package.json

@@ -99,16 +99,16 @@
     "@storybook/react": "workspace:*",
     "@storybook/test": "workspace:*",
     "styled-jsx": "5.1.6",
-    "vite-plugin-storybook-nextjs": "^1.0.11"
+    "vite-plugin-storybook-nextjs": "^1.1.0"
   },
   "devDependencies": {
     "@types/node": "^18.0.0",
-    "next": "^14.2.5",
+    "next": "^15.0.3",
     "typescript": "^5.3.2"
   },
   "peerDependencies": {
     "@storybook/test": "workspace:*",
-    "next": "^14.1.0",
+    "next": "^14.1.0 || ^15.0.0",
     "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0-beta",
     "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0-beta",
     "storybook": "workspace:^",
@@ -141,7 +141,8 @@
       "./src/images/decorator.tsx"
     ],
     "externals": [
-      "sb-original/image-context"
+      "sb-original/image-context",
+      "sb-original/default-loader"
     ],
     "platform": "node"
   },

code/frameworks/experimental-nextjs-vite/src/export-mocks/compatibility/draft-mode.compat.ts

@@ -0,0 +1,2 @@
+// @ts-expect-error Compatibility for Next 14
+export { draftMode } from 'next/dist/client/components/headers';

code/frameworks/experimental-nextjs-vite/src/export-mocks/headers/index.ts

@@ -1,14 +1,15 @@
 import { fn } from '@storybook/test';
 
-import * as originalHeaders from 'next/dist/client/components/headers';
+import { draftMode as originalDraftMode } from 'next/dist/server/request/draft-mode';
+import * as headers from 'next/dist/server/request/headers';
 
 // re-exports of the actual module
-export * from 'next/dist/client/components/headers';
+export * from 'next/dist/server/request/headers';
 
 // mock utilities/overrides (as of Next v14.2.0)
 export { headers } from './headers';
 export { cookies } from './cookies';
 
 // passthrough mocks - keep original implementation but allow for spying
-const draftMode = fn(originalHeaders.draftMode).mockName('draftMode');
+const draftMode = fn(originalDraftMode ?? (headers as any).draftMode).mockName('draftMode');
 export { draftMode };

code/frameworks/experimental-nextjs-vite/src/routing/app-router-provider.tsx

@@ -18,11 +18,14 @@ import {
   PathnameContext,
   SearchParamsContext,
 } from 'next/dist/shared/lib/hooks-client-context.shared-runtime';
-import { type Params } from 'next/dist/shared/lib/router/utils/route-matcher';
 import { PAGE_SEGMENT_KEY } from 'next/dist/shared/lib/segment';
 
 import type { RouteParams } from './types';
 
+// Using an inline type so we can support Next 14 and lower
+// from https://github.com/vercel/next.js/blob/v15.0.3/packages/next/src/server/request/params.ts#L25
+type Params = Record<string, string | Array<string> | undefined>;
+
 type AppRouterProviderProps = {
   routeParams: RouteParams;
 };

code/frameworks/experimental-nextjs-vite/template/stories/Head.stories.tsx

@@ -33,8 +33,8 @@ export const Default: Story = {
   play: async () => {
     await waitFor(() => expect(document.title).toEqual('Next.js Head Title'));
     await expect(document.querySelectorAll('meta[property="og:title"]')).toHaveLength(1);
-    await expect((document.querySelector('meta[property="og:title"]') as any).content).toEqual(
-      'My new title'
-    );
+    await expect(
+      (document.querySelector('meta[property="og:title"]') as HTMLMetaElement)?.content
+    ).toEqual('My new title');
   },
 };

code/frameworks/experimental-nextjs-vite/template/stories/ImageLegacy.stories.tsx

@@ -1,5 +1,7 @@
 import React from 'react';
 
+import type { Meta, StoryObj } from '@storybook/react';
+
 import Image from 'next/legacy/image';
 
 import Accessibility from '../../assets/accessibility.svg';
@@ -10,17 +12,19 @@ export default {
     src: Accessibility,
     alt: 'Accessibility',
   },
-};
+} as Meta<typeof Image>;
+
+type Story = StoryObj<typeof Image>;
 
-export const Default = {};
+export const Default: Story = {};
 
-export const BlurredPlaceholder = {
+export const BlurredPlaceholder: Story = {
   args: {
     placeholder: 'blur',
   },
 };
 
-export const BlurredAbsolutePlaceholder = {
+export const BlurredAbsolutePlaceholder: Story = {
   args: {
     src: 'https://storybook.js.org/images/placeholders/50x50.png',
     width: 50,

code/frameworks/experimental-nextjs-vite/template/stories/Link.stories.tsx

@@ -76,9 +76,11 @@ export default {
   component: Component,
 } as Meta<typeof Component>;
 
-export const Default: StoryObj<typeof Component> = {};
+type Story = StoryObj<typeof Component>;
 
-export const InAppDir: StoryObj<typeof Component> = {
+export const Default: Story = {};
+
+export const InAppDir: Story = {
   parameters: {
     nextjs: {
       appDirectory: true,

code/frameworks/experimental-nextjs-vite/template/stories/Navigation.stories.tsx

@@ -109,7 +109,7 @@ export default {
   },
 } as Meta<typeof Component>;
 
-export const Default: StoryObj<typeof Component> = {
+export const Default: Story = {
   play: async ({ canvasElement, step }) => {
     const canvas = within(canvasElement);
     const routerMock = getRouter();

code/frameworks/experimental-nextjs-vite/template/stories/NextHeader.stories.tsx

@@ -8,7 +8,11 @@ import NextHeader from './NextHeader';
 
 export default {
   component: NextHeader,
-  parameters: { react: { rsc: true } },
+  parameters: {
+    react: {
+      rsc: true,
+    },
+  },
 } as Meta<typeof NextHeader>;
 
 type Story = StoryObj<typeof NextHeader>;

code/frameworks/experimental-nextjs-vite/template/stories/NextHeader.tsx

@@ -5,25 +5,23 @@ import { cookies, headers } from 'next/headers';
 export default async function Component() {
   async function handleClick() {
     'use server';
-    cookies().set('user-id', 'encrypted-id');
+    (await cookies()).set('user-id', 'encrypted-id');
   }
 
   return (
     <>
       <h3>Cookies:</h3>
-      {cookies()
-        .getAll()
-        .map(({ name, value }) => {
-          return (
-            <p key={name} style={{ display: 'flex', flexDirection: 'row', gap: 8 }}>
-              <strong>Name:</strong> <span>{name}</span>
-              <strong>Value:</strong> <span>{value}</span>
-            </p>
-          );
-        })}
+      {(await cookies()).getAll().map(({ name, value }) => {
+        return (
+          <p key={name} style={{ display: 'flex', flexDirection: 'row', gap: 8 }}>
+            <strong>Name:</strong> <span>{name}</span>
+            <strong>Value:</strong> <span>{value}</span>
+          </p>
+        );
+      })}
 
       <h3>Headers:</h3>
-      {Array.from(headers().entries()).map(([name, value]: [string, string]) => {
+      {Array.from((await headers()).entries()).map(([name, value]: [string, string]) => {
         return (
           <p key={name} style={{ display: 'flex', flexDirection: 'row', gap: 8 }}>
             <strong>Name:</strong> <span>{name}</span>

code/frameworks/experimental-nextjs-vite/template/stories/RSC.stories.jsx → code/frameworks/experimental-nextjs-vite/template/stories/RSC.stories.tsx

@@ -1,5 +1,8 @@
+/* eslint-disable local-rules/no-uncategorized-errors */
 import React from 'react';
 
+import type { Meta, StoryObj } from '@storybook/react';
+
 import { Nested, RSC } from './RSC';
 
 export default {
@@ -10,19 +13,21 @@ export default {
       rsc: true,
     },
   },
-};
+} as Meta<typeof RSC>;
+
+type Story = StoryObj<typeof RSC>;
 
-export const Default = {};
+export const Default: Story = {};
 
-export const DisableRSC = {
+export const DisableRSC: Story = {
   tags: ['!test'],
   parameters: {
     chromatic: { disable: true },
     nextjs: { rsc: false },
   },
 };
 
-export const Error = {
+export const Errored: Story = {
   tags: ['!test', '!vitest'],
   parameters: {
     chromatic: { disable: true },
@@ -32,7 +37,7 @@ export const Error = {
   },
 };
 
-export const NestedRSC = {
+export const NestedRSC: Story = {
   render: (args) => (
     <Nested>
       <RSC {...args} />

code/frameworks/experimental-nextjs-vite/template/stories/RSC.tsx

@@ -0,0 +1,7 @@
+import React from 'react';
+
+import 'server-only';
+
+export const RSC = async ({ label }: { label: string }) => <>RSC {label}</>;
+
+export const Nested = async ({ children }: any) => <>Nested {children}</>;

code/frameworks/experimental-nextjs-vite/template/stories/ServerActions.stories.tsx

@@ -59,7 +59,9 @@ export default {
   },
 } as Meta<typeof Component>;
 
-export const ProtectedWhileLoggedOut: StoryObj<typeof Component> = {
+type Story = StoryObj<typeof Component>;
+
+export const ProtectedWhileLoggedOut: Story = {
   play: async ({ canvasElement }) => {
     const canvas = within(canvasElement);
     await userEvent.click(canvas.getByText('Access protected route'));
@@ -71,7 +73,7 @@ export const ProtectedWhileLoggedOut: StoryObj<typeof Component> = {
   },
 };
 
-export const ProtectedWhileLoggedIn: StoryObj<typeof Component> = {
+export const ProtectedWhileLoggedIn: Story = {
   beforeEach() {
     cookies().set('user', 'storybookjs');
   },
@@ -87,7 +89,7 @@ export const ProtectedWhileLoggedIn: StoryObj<typeof Component> = {
   },
 };
 
-export const Logout: StoryObj<typeof Component> = {
+export const Logout: Story = {
   beforeEach() {
     cookies().set('user', 'storybookjs');
   },
@@ -103,7 +105,7 @@ export const Logout: StoryObj<typeof Component> = {
   },
 };
 
-export const Login: StoryObj<typeof Component> = {
+export const Login: Story = {
   play: async ({ canvasElement }) => {
     const canvas = within(canvasElement);
     await userEvent.click(canvas.getByText('Login'));

code/frameworks/experimental-nextjs-vite/template/stories/ServerActions.tsx

@@ -5,7 +5,7 @@ import { cookies } from 'next/headers';
 import { redirect } from 'next/navigation';
 
 export async function accessRoute() {
-  const user = cookies().get('user');
+  const user = (await cookies()).get('user');
 
   if (!user) {
     redirect('/');
@@ -16,13 +16,13 @@ export async function accessRoute() {
 }
 
 export async function logout() {
-  cookies().delete('user');
+  (await cookies()).delete('user');
   revalidatePath('/');
   redirect('/');
 }
 
 export async function login() {
-  cookies().set('user', 'storybookjs');
+  (await cookies()).set('user', 'storybookjs');
   revalidatePath('/');
   redirect('/');
 }

code/frameworks/experimental-nextjs-vite/template/stories/StyledJsx.stories.jsx → code/frameworks/experimental-nextjs-vite/template/stories/StyledJsx.stories.tsx

@@ -1,5 +1,7 @@
 import React from 'react';
 
+import type { Meta, StoryObj } from '@storybook/react';
+
 const Component = () => (
   <div>
     <style jsx>{`
@@ -15,6 +17,6 @@ const Component = () => (
 
 export default {
   component: Component,
-};
+} as Meta<typeof Component>;
 
-export const Default = {};
+export const Default: StoryObj<typeof Component> = {};

code/frameworks/nextjs/src/compatibility/draft-mode.compat.ts

@@ -1,2 +1,2 @@
-// Compatibility for Next 14
+// @ts-expect-error Compatibility for Next 14
 export { draftMode } from 'next/dist/client/components/headers';

code/frameworks/nextjs/src/export-mocks/headers/index.ts

@@ -1,6 +1,5 @@
 import { fn } from '@storybook/test';
 
-// This export won't exist in Next.js 14 but it's safe because we ignore it in Webpack when applicable
 import { draftMode as originalDraftMode } from 'next/dist/server/request/draft-mode';
 import * as headers from 'next/dist/server/request/headers';
 

code/frameworks/nextjs/template/stories/RSC.stories.tsx

@@ -28,7 +28,7 @@ export const DisableRSC: Story = {
 };
 
 export const Errored: Story = {
-  tags: ['!test'],
+  tags: ['!test', '!vitest'],
   parameters: {
     chromatic: { disable: true },
   },

code/lib/cli-storybook/src/sandbox-templates.ts

@@ -208,7 +208,7 @@ const baseTemplates = {
     },
     skipTasks: ['e2e-tests-dev', 'bench', 'vitest-integration'],
   },
-  'experimental-nextjs-vite/default-ts': {
+  'experimental-nextjs-vite/14-ts': {
     name: 'Next.js Latest (Vite | TypeScript)',
     script:
       'npx create-next-app@^14 {{beforeDir}} --eslint --tailwind --app --import-alias="@/*" --src-dir',
@@ -229,6 +229,30 @@ const baseTemplates = {
         'prop-types',
       ],
     },
+    inDevelopment: true,
+    skipTasks: ['e2e-tests-dev', 'bench'],
+  },
+  'experimental-nextjs-vite/default-ts': {
+    name: 'Next.js Latest (Vite | TypeScript)',
+    script:
+      'npx create-next-app {{beforeDir}} --eslint --tailwind --app --import-alias="@/*" --src-dir',
+    expected: {
+      framework: '@storybook/experimental-nextjs-vite',
+      renderer: '@storybook/react',
+      builder: '@storybook/builder-vite',
+    },
+    modifications: {
+      mainConfig: {
+        framework: '@storybook/experimental-nextjs-vite',
+        features: { experimentalRSC: true },
+      },
+      extraDependencies: [
+        'server-only',
+        '@storybook/experimental-nextjs-vite',
+        'vite',
+        'prop-types',
+      ],
+    },
     skipTasks: ['e2e-tests-dev', 'bench'],
   },
   'react-vite/default-js': {