fix(router-ssr): ensure charset meta is placed before dehydration script

e2e/react-start/encoding/.gitignore

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+node_modules
+package-lock.json
+yarn.lock
+
+.DS_Store
+.cache
+.env
+.vercel
+.output
+
+/build/
+/api/
+/server/build
+/public/build
+# Sentry Config File
+.env.sentry-build-plugin
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/

e2e/react-start/encoding/.prettierignore

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+**/build
+**/public
+pnpm-lock.yaml
+routeTree.gen.ts

e2e/react-start/encoding/package.json

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+{
+  "name": "tanstack-react-start-e2e-encoding",
+  "private": true,
+  "sideEffects": false,
+  "type": "module",
+  "scripts": {
+    "dev": "vite dev --port 3000",
+    "dev:e2e": "vite dev",
+    "build": "vite build && tsc --noEmit",
+    "start": "node .output/server/index.mjs",
+    "test:e2e": "rm -rf port*.txt; playwright test --project=chromium"
+  },
+  "dependencies": {
+    "@tanstack/react-router": "workspace:^",
+    "@tanstack/react-router-devtools": "workspace:^",
+    "@tanstack/react-start": "workspace:^",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "redaxios": "^0.5.1",
+    "tailwind-merge": "^2.6.0",
+    "vite": "6.3.5",
+    "zod": "^3.24.2"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.50.1",
+    "@tanstack/router-e2e-utils": "workspace:^",
+    "@types/node": "^22.10.2",
+    "@types/react": "^19.0.8",
+    "@types/react-dom": "^19.0.3",
+    "@vitejs/plugin-react": "^4.3.4",
+    "autoprefixer": "^10.4.20",
+    "combinate": "^1.1.11",
+    "postcss": "^8.5.1",
+    "tailwindcss": "^3.4.17",
+    "typescript": "^5.7.2",
+    "vite-tsconfig-paths": "^5.1.4"
+  }
+}

e2e/react-start/encoding/playwright.config.ts

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+import { defineConfig, devices } from '@playwright/test'
+import {
+  getDummyServerPort,
+  getTestServerPort,
+} from '@tanstack/router-e2e-utils'
+import packageJson from './package.json' with { type: 'json' }
+
+const PORT = await getTestServerPort(packageJson.name)
+const EXTERNAL_PORT = await getDummyServerPort(packageJson.name)
+const baseURL = `http://localhost:${PORT}`
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+export default defineConfig({
+  testDir: './tests',
+  workers: 1,
+
+  reporter: [['line']],
+
+  globalSetup: './tests/setup/global.setup.ts',
+  globalTeardown: './tests/setup/global.teardown.ts',
+
+  use: {
+    /* Base URL to use in actions like `await page.goto('/')`. */
+    baseURL,
+  },
+
+  webServer: {
+    command: `VITE_NODE_ENV="test" VITE_EXTERNAL_PORT=${EXTERNAL_PORT} pnpm build && VITE_NODE_ENV="test" VITE_EXTERNAL_PORT=${EXTERNAL_PORT} VITE_SERVER_PORT=${PORT} PORT=${PORT} pnpm start`,
+    url: baseURL,
+    reuseExistingServer: !process.env.CI,
+    stdout: 'pipe',
+  },
+
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+})

e2e/react-start/encoding/postcss.config.mjs

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+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}

e2e/react-start/encoding/src/client.tsx

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+// DO NOT DELETE THIS FILE!!!
+// This file is a good smoke test to make sure the custom client entry is working
+import { StrictMode, startTransition } from 'react'
+import { hydrateRoot } from 'react-dom/client'
+import { StartClient } from '@tanstack/react-start'
+import { createRouter } from './router'
+
+console.log("[client-entry]: using custom client entry in 'src/client.tsx'")
+
+const router = createRouter()
+
+startTransition(() => {
+  hydrateRoot(
+    document,
+    <StrictMode>
+      <StartClient router={router} />
+    </StrictMode>,
+  )
+})

e2e/react-start/encoding/src/components/CustomMessage.tsx

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+import * as React from 'react'
+
+export function CustomMessage({ message }: { message: string }) {
+  return (
+    <div className="py-2">
+      <div className="italic">This is a custom message:</div>
+      <p>{message}</p>
+    </div>
+  )
+}

e2e/react-start/encoding/src/components/DefaultCatchBoundary.tsx

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+import {
+  ErrorComponent,
+  Link,
+  rootRouteId,
+  useMatch,
+  useRouter,
+} from '@tanstack/react-router'
+import type { ErrorComponentProps } from '@tanstack/react-router'
+
+export function DefaultCatchBoundary({ error }: ErrorComponentProps) {
+  const router = useRouter()
+  const isRoot = useMatch({
+    strict: false,
+    select: (state) => state.id === rootRouteId,
+  })
+
+  console.error(error)
+
+  return (
+    <div className="min-w-0 flex-1 p-4 flex flex-col items-center justify-center gap-6">
+      <ErrorComponent error={error} />
+      <div className="flex gap-2 items-center flex-wrap">
+        <button
+          onClick={() => {
+            router.invalidate()
+          }}
+          className={`px-2 py-1 bg-gray-600 dark:bg-gray-700 rounded text-white uppercase font-extrabold`}
+        >
+          Try Again
+        </button>
+        {isRoot ? (
+          <Link
+            to="/"
+            className={`px-2 py-1 bg-gray-600 dark:bg-gray-700 rounded text-white uppercase font-extrabold`}
+          >
+            Home
+          </Link>
+        ) : (
+          <Link
+            to="/"
+            className={`px-2 py-1 bg-gray-600 dark:bg-gray-700 rounded text-white uppercase font-extrabold`}
+            onClick={(e) => {
+              e.preventDefault()
+              window.history.back()
+            }}
+          >
+            Go Back
+          </Link>
+        )}
+      </div>
+    </div>
+  )
+}

e2e/react-start/encoding/src/components/NotFound.tsx

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+import { Link } from '@tanstack/react-router'
+
+export function NotFound({ children }: { children?: any }) {
+  return (
+    <div className="space-y-2 p-2" data-testid="default-not-found-component">
+      <div className="text-gray-600 dark:text-gray-400">
+        {children || <p>The page you are looking for does not exist.</p>}
+      </div>
+      <p className="flex items-center gap-2 flex-wrap">
+        <button
+          onClick={() => window.history.back()}
+          className="bg-emerald-500 text-white px-2 py-1 rounded uppercase font-black text-sm"
+        >
+          Go back
+        </button>
+        <Link
+          to="/"
+          className="bg-cyan-600 text-white px-2 py-1 rounded uppercase font-black text-sm"
+        >
+          Start Over
+        </Link>
+      </p>
+    </div>
+  )
+}

e2e/react-start/encoding/src/routeTree.gen.ts

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+/* eslint-disable */
+
+// @ts-nocheck
+
+// noinspection JSUnusedGlobalSymbols
+
+// This file was automatically generated by TanStack Router.
+// You should NOT make any changes in this file as it will be overwritten.
+// Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
+
+import type { CreateFileRoute, FileRoutesByPath } from '@tanstack/react-router'
+import type {
+  CreateServerFileRoute,
+  ServerFileRoutesByPath,
+} from '@tanstack/react-start/server'
+
+import { Route as rootRouteImport } from './routes/__root'
+import { Route as NoCharsetRouteImport } from './routes/no-charset'
+import { Route as CharsetRouteImport } from './routes/charset'
+import { Route as IndexRouteImport } from './routes/index'
+
+const NoCharsetRoute = NoCharsetRouteImport.update({
+  id: '/no-charset',
+  path: '/no-charset',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const CharsetRoute = CharsetRouteImport.update({
+  id: '/charset',
+  path: '/charset',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const IndexRoute = IndexRouteImport.update({
+  id: '/',
+  path: '/',
+  getParentRoute: () => rootRouteImport,
+} as any)
+
+export interface FileRoutesByFullPath {
+  '/': typeof IndexRoute
+  '/charset': typeof CharsetRoute
+  '/no-charset': typeof NoCharsetRoute
+}
+export interface FileRoutesByTo {
+  '/': typeof IndexRoute
+  '/charset': typeof CharsetRoute
+  '/no-charset': typeof NoCharsetRoute
+}
+export interface FileRoutesById {
+  __root__: typeof rootRouteImport
+  '/': typeof IndexRoute
+  '/charset': typeof CharsetRoute
+  '/no-charset': typeof NoCharsetRoute
+}
+export interface FileRouteTypes {
+  fileRoutesByFullPath: FileRoutesByFullPath
+  fullPaths: '/' | '/charset' | '/no-charset'
+  fileRoutesByTo: FileRoutesByTo
+  to: '/' | '/charset' | '/no-charset'
+  id: '__root__' | '/' | '/charset' | '/no-charset'
+  fileRoutesById: FileRoutesById
+}
+export interface RootRouteChildren {
+  IndexRoute: typeof IndexRoute
+  CharsetRoute: typeof CharsetRoute
+  NoCharsetRoute: typeof NoCharsetRoute
+}
+
+declare module '@tanstack/react-router' {
+  interface FileRoutesByPath {
+    '/': {
+      id: '/'
+      path: '/'
+      fullPath: '/'
+      preLoaderRoute: typeof IndexRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/charset': {
+      id: '/charset'
+      path: '/charset'
+      fullPath: '/charset'
+      preLoaderRoute: typeof CharsetRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/no-charset': {
+      id: '/no-charset'
+      path: '/no-charset'
+      fullPath: '/no-charset'
+      preLoaderRoute: typeof NoCharsetRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+  }
+}
+
+declare module './routes/index' {
+  const createFileRoute: CreateFileRoute<
+    '/',
+    FileRoutesByPath['/']['parentRoute'],
+    FileRoutesByPath['/']['id'],
+    FileRoutesByPath['/']['path'],
+    FileRoutesByPath['/']['fullPath']
+  >
+
+  const createServerFileRoute: CreateServerFileRoute<
+    ServerFileRoutesByPath['/']['parentRoute'],
+    ServerFileRoutesByPath['/']['id'],
+    ServerFileRoutesByPath['/']['path'],
+    ServerFileRoutesByPath['/']['fullPath'],
+    unknown
+  >
+}
+declare module './routes/charset' {
+  const createFileRoute: CreateFileRoute<
+    '/charset',
+    FileRoutesByPath['/charset']['parentRoute'],
+    FileRoutesByPath['/charset']['id'],
+    FileRoutesByPath['/charset']['path'],
+    FileRoutesByPath['/charset']['fullPath']
+  >
+
+  const createServerFileRoute: CreateServerFileRoute<
+    ServerFileRoutesByPath['/charset']['parentRoute'],
+    ServerFileRoutesByPath['/charset']['id'],
+    ServerFileRoutesByPath['/charset']['path'],
+    ServerFileRoutesByPath['/charset']['fullPath'],
+    unknown
+  >
+}
+declare module './routes/no-charset' {
+  const createFileRoute: CreateFileRoute<
+    '/no-charset',
+    FileRoutesByPath['/no-charset']['parentRoute'],
+    FileRoutesByPath['/no-charset']['id'],
+    FileRoutesByPath['/no-charset']['path'],
+    FileRoutesByPath['/no-charset']['fullPath']
+  >
+
+  const createServerFileRoute: CreateServerFileRoute<
+    ServerFileRoutesByPath['/no-charset']['parentRoute'],
+    ServerFileRoutesByPath['/no-charset']['id'],
+    ServerFileRoutesByPath['/no-charset']['path'],
+    ServerFileRoutesByPath['/no-charset']['fullPath'],
+    unknown
+  >
+}
+
+const rootRouteChildren: RootRouteChildren = {
+  IndexRoute: IndexRoute,
+  CharsetRoute: CharsetRoute,
+  NoCharsetRoute: NoCharsetRoute,
+}
+export const routeTree = rootRouteImport
+  ._addFileChildren(rootRouteChildren)
+  ._addFileTypes<FileRouteTypes>()