feat: (start) add option to load assets from different domain than the app

e2e/react-start/custom-manifest-base/.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/custom-manifest-base/.prettierignore

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

e2e/react-start/custom-manifest-base/express-server.ts

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+import express from 'express'
+import { toNodeHandler } from 'srvx/node'
+import cors from 'cors'
+
+const DEVELOPMENT = process.env.NODE_ENV === 'development'
+const PORT = Number.parseInt(process.env.PORT || '3000')
+
+const app = express()
+
+const cdn = express()
+
+if (DEVELOPMENT) {
+  const viteDevServer = await import('vite').then((vite) =>
+    vite.createServer({
+      server: { middlewareMode: true },
+    }),
+  )
+  app.use(viteDevServer.middlewares)
+  app.use(async (req, res, next) => {
+    try {
+      const { default: serverEntry } =
+        await viteDevServer.ssrLoadModule('./src/server.ts')
+      const handler = toNodeHandler(serverEntry.fetch)
+      await handler(req, res)
+    } catch (error) {
+      if (typeof error === 'object' && error instanceof Error) {
+        viteDevServer.ssrFixStacktrace(error)
+      }
+      next(error)
+    }
+  })
+} else {
+  const { default: handler } = await import('./dist/server/server.js')
+  const nodeHandler = toNodeHandler(handler.fetch)
+  cdn.use(cors())
+  cdn.use('', express.static('dist/client'))
+  app.use(async (req, res, next) => {
+    try {
+      await nodeHandler(req, res)
+    } catch (error) {
+      next(error)
+    }
+  })
+}
+
+cdn.listen(3001, () => {
+  console.log(`CDN is running on http://localhost:3001`)
+})
+app.listen(PORT, () => {
+  console.log(`Server is running on http://localhost:${PORT}`)
+})

e2e/react-start/custom-manifest-base/package.json

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+{
+  "name": "tanstack-react-start-e2e-custom-manifest-base",
+  "private": true,
+  "sideEffects": false,
+  "type": "module",
+  "scripts": {
+    "dev": "cross-env NODE_ENV=development tsx express-server.ts",
+    "build": "vite build && tsc --noEmit",
+    "start": "tsx express-server.ts",
+    "test:e2e": "rm -rf port*.txt; playwright test --project=chromium"
+  },
+  "dependencies": {
+    "@tanstack/react-router": "workspace:^",
+    "@tanstack/react-router-devtools": "workspace:^",
+    "@tanstack/react-start": "workspace:^",
+    "cors": "^2.8.5",
+    "express": "^4.21.2",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "redaxios": "^0.5.1"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.50.1",
+    "@tanstack/router-e2e-utils": "workspace:^",
+    "@types/cors": "^2.8.19",
+    "@types/express": "^5.0.3",
+    "@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",
+    "cross-env": "^10.0.0",
+    "postcss": "^8.5.1",
+    "srvx": "^0.8.6",
+    "tailwindcss": "^3.4.17",
+    "tsx": "^4.20.3",
+    "typescript": "^5.7.2",
+    "vite": "^7.1.7",
+    "vite-tsconfig-paths": "^5.1.4"
+  }
+}

e2e/react-start/custom-manifest-base/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:${PORT}/custom/basepath`
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+export default defineConfig({
+  testDir: './tests',
+  workers: 1,
+
+  reporter: [['line']],
+
+  globalSetup: './tests/setup/global.setup.ts',
+  globalTeardown: './tests/setup/global.teardown.ts',
+
+  use: {
+    /* Base URL to use in actions like `await page.goto('/')`. */
+    baseURL,
+  },
+
+  webServer: {
+    command: `VITE_NODE_ENV="test" VITE_EXTERNAL_PORT=${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/custom-manifest-base/postcss.config.mjs

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

e2e/react-start/custom-manifest-base/public/script.js

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+console.log('SCRIPT_1 loaded')
+window.SCRIPT_1 = true

e2e/react-start/custom-manifest-base/public/script2.js

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+console.log('SCRIPT_2 loaded')
+window.SCRIPT_2 = true

e2e/react-start/custom-manifest-base/public/site.webmanifest

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+{
+  "name": "",
+  "short_name": "",
+  "icons": [
+    {
+      "src": "/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}

e2e/react-start/custom-manifest-base/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/custom-manifest-base/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/custom-manifest-base/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>
+  )
+}