fix(start): fixed route scripts filtering

e2e/start/basic/app/routeTree.gen.ts

@@ -15,6 +15,7 @@ import { Route as UsersImport } from './routes/users'
 import { Route as StatusImport } from './routes/status'
 import { Route as ServerFnsImport } from './routes/server-fns'
 import { Route as SearchParamsImport } from './routes/search-params'
+import { Route as ScriptsImport } from './routes/scripts'
 import { Route as PostsImport } from './routes/posts'
 import { Route as LinksImport } from './routes/links'
 import { Route as IsomorphicFnsImport } from './routes/isomorphic-fns'
@@ -66,6 +67,12 @@ const SearchParamsRoute = SearchParamsImport.update({
   getParentRoute: () => rootRoute,
 } as any)
 
+const ScriptsRoute = ScriptsImport.update({
+  id: '/scripts',
+  path: '/scripts',
+  getParentRoute: () => rootRoute,
+} as any)
+
 const PostsRoute = PostsImport.update({
   id: '/posts',
   path: '/posts',
@@ -266,6 +273,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof PostsImport
       parentRoute: typeof rootRoute
     }
+    '/scripts': {
+      id: '/scripts'
+      path: '/scripts'
+      fullPath: '/scripts'
+      preLoaderRoute: typeof ScriptsImport
+      parentRoute: typeof rootRoute
+    }
     '/search-params': {
       id: '/search-params'
       path: '/search-params'
@@ -501,6 +515,7 @@ export interface FileRoutesByFullPath {
   '/isomorphic-fns': typeof IsomorphicFnsRoute
   '/links': typeof LinksRoute
   '/posts': typeof PostsRouteWithChildren
+  '/scripts': typeof ScriptsRoute
   '/search-params': typeof SearchParamsRoute
   '/server-fns': typeof ServerFnsRoute
   '/status': typeof StatusRoute
@@ -530,6 +545,7 @@ export interface FileRoutesByTo {
   '/env-only': typeof EnvOnlyRoute
   '/isomorphic-fns': typeof IsomorphicFnsRoute
   '/links': typeof LinksRoute
+  '/scripts': typeof ScriptsRoute
   '/search-params': typeof SearchParamsRoute
   '/server-fns': typeof ServerFnsRoute
   '/status': typeof StatusRoute
@@ -559,6 +575,7 @@ export interface FileRoutesById {
   '/isomorphic-fns': typeof IsomorphicFnsRoute
   '/links': typeof LinksRoute
   '/posts': typeof PostsRouteWithChildren
+  '/scripts': typeof ScriptsRoute
   '/search-params': typeof SearchParamsRoute
   '/server-fns': typeof ServerFnsRoute
   '/status': typeof StatusRoute
@@ -592,6 +609,7 @@ export interface FileRouteTypes {
     | '/isomorphic-fns'
     | '/links'
     | '/posts'
+    | '/scripts'
     | '/search-params'
     | '/server-fns'
     | '/status'
@@ -620,6 +638,7 @@ export interface FileRouteTypes {
     | '/env-only'
     | '/isomorphic-fns'
     | '/links'
+    | '/scripts'
     | '/search-params'
     | '/server-fns'
     | '/status'
@@ -647,6 +666,7 @@ export interface FileRouteTypes {
     | '/isomorphic-fns'
     | '/links'
     | '/posts'
+    | '/scripts'
     | '/search-params'
     | '/server-fns'
     | '/status'
@@ -679,6 +699,7 @@ export interface RootRouteChildren {
   IsomorphicFnsRoute: typeof IsomorphicFnsRoute
   LinksRoute: typeof LinksRoute
   PostsRoute: typeof PostsRouteWithChildren
+  ScriptsRoute: typeof ScriptsRoute
   SearchParamsRoute: typeof SearchParamsRoute
   ServerFnsRoute: typeof ServerFnsRoute
   StatusRoute: typeof StatusRoute
@@ -696,6 +717,7 @@ const rootRouteChildren: RootRouteChildren = {
   IsomorphicFnsRoute: IsomorphicFnsRoute,
   LinksRoute: LinksRoute,
   PostsRoute: PostsRouteWithChildren,
+  ScriptsRoute: ScriptsRoute,
   SearchParamsRoute: SearchParamsRoute,
   ServerFnsRoute: ServerFnsRoute,
   StatusRoute: StatusRoute,
@@ -722,6 +744,7 @@ export const routeTree = rootRoute
         "/isomorphic-fns",
         "/links",
         "/posts",
+        "/scripts",
         "/search-params",
         "/server-fns",
         "/status",
@@ -759,6 +782,9 @@ export const routeTree = rootRoute
         "/posts/"
       ]
     },
+    "/scripts": {
+      "filePath": "scripts.tsx"
+    },
     "/search-params": {
       "filePath": "search-params.tsx"
     },

e2e/start/basic/app/routes/__root.tsx

@@ -112,6 +112,14 @@ function RootDocument({ children }: { children: React.ReactNode }) {
           >
             Layout
           </Link>{' '}
+          <Link
+            to="/scripts"
+            activeProps={{
+              className: 'font-bold',
+            }}
+          >
+            Scripts
+          </Link>{' '}
           <Link
             to="/deferred"
             activeProps={{

e2e/start/basic/app/routes/scripts.tsx

@@ -0,0 +1,33 @@
+import { createFileRoute } from '@tanstack/react-router'
+
+const isProd = import.meta.env.PROD
+
+export const Route = createFileRoute('/scripts')({
+  head: () => ({
+    scripts: [
+      {
+        src: 'script.js',
+        ['data-testid']: 'script',
+      },
+      isProd
+        ? undefined
+        : {
+            src: 'script2.js',
+            ['data-testid']: 'script2',
+          },
+    ],
+  }),
+  component: ScriptsComponent,
+})
+
+function ScriptsComponent() {
+  return (
+    <div className="p-2">
+      <h3>Scripts Test</h3>
+      <p>
+        Both `script.js` and `script2.js` are included in development, but only
+        `script.js` is included in production.
+      </p>
+    </div>
+  )
+}

e2e/start/basic/public/script.js

@@ -0,0 +1,2 @@
+// eslint-disable no-empty-file
+// This empty script file is for testing purposes only

e2e/start/basic/public/script2.js

@@ -0,0 +1,2 @@
+// eslint-disable no-empty-file
+// This empty script file is for testing purposes only

e2e/start/basic/tests/base.spec.ts

@@ -32,6 +32,15 @@ test('Navigating nested layouts', async ({ page }) => {
   await expect(page.locator('body')).toContainText("I'm layout B!")
 })
 
+test('Navigating to route with scripts', async ({ page }) => {
+  await page.goto('/')
+
+  await page.getByRole('link', { name: 'Scripts' }).click()
+
+  await expect(page.getByTestId('script')).toHaveCount(1)
+  await expect(page.getByTestId('script2')).toHaveCount(0)
+})
+
 test('Navigating to a not-found route', async ({ page }) => {
   await page.goto('/')
 
@@ -79,10 +88,12 @@ test('invoking a server function with custom response status code', async ({
       expect(response.status()).toBe(225)
       expect(response.statusText()).toBe('hello')
       expect(response.headers()['content-type']).toBe('application/json')
-      expect(await response.json()).toEqual({
-        result: { hello: 'world' },
-        context: {},
-      })
+      expect(await response.json()).toEqual(
+        expect.objectContaining({
+          result: { hello: 'world' },
+          context: {},
+        }),
+      )
       resolve()
     })
   })
@@ -193,7 +204,7 @@ test('env-only functions can only be called on the server or client respectively
   )
 })
 
-test.only('Server function can return null for GET and POST calls', async ({
+test('Server function can return null for GET and POST calls', async ({
   page,
 }) => {
   await page.goto('/server-fns')

e2e/start/basic/tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "include": ["**/*.ts", "**/*.tsx"],
+  "include": ["**/*.ts", "**/*.tsx", "public/script*.js"],
   "compilerOptions": {
     "strict": true,
     "esModuleInterop": true,

packages/start/src/client/Scripts.tsx

@@ -33,8 +33,8 @@ export const Scripts = () => {
       scripts: (
         state.matches
           .map((match) => match.scripts!)
-          .filter(Boolean)
-          .flat(1) as Array<RouterManagedTag>
+          .flat(1)
+          .filter(Boolean) as Array<RouterManagedTag>
       ).map(({ children, ...script }) => ({
         tag: 'script',
         attrs: {

packages/start/src/client/tests/index.test.tsx

@@ -72,6 +72,55 @@ describe('ssr scripts', () => {
       `<script src="script.js"></script><script src="script2.js"></script><script src="script3.js"></script>`,
     )
   })
+
+  test('excludes `undefined` script values', async () => {
+    const rootRoute = createRootRoute({
+      head: () => {
+        return {
+          scripts: [
+            { src: 'script.js' },
+            undefined, // 'script2.js' opted out by certain conditions, such as `NODE_ENV=production`.
+          ],
+        }
+      },
+      component: () => {
+        return <Scripts />
+      },
+    })
+
+    const indexRoute = createRoute({
+      path: '/',
+      getParentRoute: () => rootRoute,
+      head: () => {
+        return {
+          scripts: [{ src: 'script3.js' }],
+        }
+      },
+    })
+
+    const router = createRouter({
+      history: createMemoryHistory({
+        initialEntries: ['/'],
+      }),
+      routeTree: rootRoute.addChildren([indexRoute]),
+    })
+
+    router.isServer = true
+
+    await router.load()
+
+    expect(router.state.matches.map((d) => d.scripts).flat(1)).toEqual([
+      { src: 'script.js' },
+      undefined,
+      { src: 'script3.js' },
+    ])
+
+    const { container } = render(<RouterProvider router={router} />)
+
+    expect(container.innerHTML).toEqual(
+      `<script src="script.js"></script><script src="script3.js"></script>`,
+    )
+  })
 })
 
 describe('ssr meta', () => {