TypeError: (0 , __vite_ssr_import_11__.u) is not a function

Which project does this relate to?

Start

Describe the bug

System Info

System:

• OS: Windows 11 10.0.26200
• CPU: (12) x64 12th Gen Intel(R) Core(TM) i5-12450H
• Memory: 4.34 GB / 15.71 GB
• Binaries:
• Node: 24.13.1 - C:\Users\kar\scoop\apps\nodejs-lts\current\node.EXE
• npm: 11.8.0 - C:\Users\kar\scoop\apps\nodejs-lts\current\npm.CMD
• pnpm: 11.1.1 - C:\Users\kar\scoop\shims\pnpm.EXE
• bun: 1.3.9 - C:\Users\kar\scoop\shims\bun.EXE

other info:

• @tanstack/react-router: 1.169.2
• @tanstack/react-start: 1.167.65
• wrangler: 4.92.0
• @cloudflare/vite-plugin: 1.37.1

Description

If I add @cloudflare/vite-plugin in the project's vite.config.ts and running dev server, the start will throw error:

PS E:\readen> pnpm run dev-web
$ pnpm --filter @readest/readest-app dev-web
$ dotenv -e .env.web -- vite dev
(node:27460) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
Using secrets defined in .env

  VITE v8.0.13  ready in 12715 ms

  ➜  Local:   http://localhost:5173/
  ➜  Network: use --host to expose
  ➜  Debug:   http://localhost:5173/__debug
  ➜  press b + enter to list configured Cloudflare bindings
  ➜  press e + enter to open local explorer
  ➜  press t + enter to start tunnel
  ➜  press h + enter to show help

🌼   daisyUI 4.12.24
├─ ✔︎ 24 themes added            https://daisyui.com/docs/themes
╰─ ❤︎ Support daisyUI project:   https://opencollective.com/daisyui

TypeError: (0 , __vite_ssr_import_11__.u) is not a function
    at runInRunnerObject (workers/runner-worker/index.js:107:3)
    ... 5 lines matching cause stack trace ...
    at maybeCaptureError (workers/runner-worker/index.js:51:10) {
  cause: TypeError: (0 , __vite_ssr_import_11__.u) is not a function
      at runInRunnerObject (workers/runner-worker/index.js:107:3)
      at async Promise.all (index 0)
      at loadEntries (E:/readen/node_modules/.pnpm/@tanstack+start-server-core@1.167.30/node_modules/@tanstack/start-server-core/src/createStartHandler.ts:351:53)
      at startRequestResolver (E:/readen/node_modules/.pnpm/@tanstack+start-server-core@1.167.30/node_modules/@tanstack/start-server-core/src/createStartHandler.ts:684:23)
      at Object.fetch (E:/readen/node_modules/.pnpm/@tanstack+react-start@1.167_f6291eabd0fa275f3000be2506700c3c/node_modules/@tanstack/react-start/src/default-entry/server.ts:16:14)
      at Object.fetch (E:/readen/node_modules/.pnpm/@tanstack+react-start@1.167_f6291eabd0fa275f3000be2506700c3c/node_modules/@tanstack/react-start/src/default-entry/server.ts:16:14)
      at maybeCaptureError (workers/runner-worker/index.js:51:10) {
    remote: true
  },
  status: 500,
  statusText: undefined,
  headers: undefined,
  data: undefined,
  body: undefined,
  unhandled: true
}
  ➜  Tunnel closed

The vite.config.ts file:

import path from "node:path";
import { cloudflare } from "@cloudflare/vite-plugin";
import { tanstackStart } from "@tanstack/react-start/plugin/vite";
import viteReact from "@vitejs/plugin-react";
import { defineConfig } from "vite";

export default defineConfig(() => {
	return {
		plugins: [
			cloudflare({
				viteEnvironment: { name: "ssr" },
			}),
			tanstackStart({
				srcDirectory: "./src",
				router: {
					routesDirectory: "app",
					routeFileIgnorePattern:
						"(components|utils|hooks|services|context|store|types|helpers|libs)|ShareLanding.tsx|SharePage.tsx|shareRoute.ts|OpenAnnotationPage.tsx|ReaderContent.tsx|ReaderRoutePage.tsx|readerSearch.ts|not-found.tsx|render.tsx",
					// Bundle all UI components (component, pending, error, notFound) for a
					// route into one chunk separate from the route definition + loader.
					// Reduces the per-route waterfall and shrinks the eager route shell.
					codeSplittingOptions: {
						defaultBehavior: [
							[
								"component",
								"pendingComponent",
								"errorComponent",
								"notFoundComponent",
							],
						],
					},
				},
			}),
			viteReact(),
		],

		resolve: {
			tsconfigPaths: true,
			alias: [
				{
					find: /^@\/components\/ui\/(.*)/,
					replacement: path.resolve("src/components/primitives/$1"),
				},
				{
					find: /^@pdfjs\/(.*)/,
					replacement: path.resolve("public/vendor/pdfjs/$1"),
				},
				{
					find: /^@simplecc\/(.*)/,
					replacement: path.resolve("public/vendor/simplecc/$1"),
				},
				{ find: /^@\/(.*)/, replacement: path.resolve("src/$1") },
				{
					find: "js-mdict",
					replacement: path.resolve("../../packages/js-mdict/src/index.ts"),
				},
			],
		},
		build: {
			sourcemap: true,
			rolldownOptions: {
				platform: "browser",
			},
			rollupOptions: {
				external: ["tauri-plugin-turso", "js-mdict"],
				onwarn(warning, defaultHandler) {
					if (
						warning.message?.includes(
							"Can't resolve original location of error",
						)
					)
						return;
					defaultHandler(warning);
				},
			},
		},
		ssr: {
			noExternal: ["tinycolor2"],
		},
		optimizeDeps: {
			include: ["react", "react-dom", "fflate"],
		},
	};
});

Complete minimal reproducer

https://github.com/0x0501/readen

Steps to Reproduce the Bug

1. clone the repo: https://github.com/0x0501/readen
2. install dependencies:

# might need to rerun this when code is updated
git submodule update --init --recursive
pnpm install
# copy vendors dist libs to public directory
pnpm --filter @readest/readest-app setup-vendors

3. add @cloudflare/vite-plugin to apps/readest-app/vite.config.ts
4. running pnpm run dev-web

Expected behavior

No error occurred when running pnpm run dev-web.

Screenshots or Videos

No response

Platform

System:

• OS: Windows 11 10.0.26200
• CPU: (12) x64 12th Gen Intel(R) Core(TM) i5-12450H
• Memory: 4.34 GB / 15.71 GB
• Binaries:
• Node: 24.13.1 - C:\Users\kar\scoop\apps\nodejs-lts\current\node.EXE
• npm: 11.8.0 - C:\Users\kar\scoop\apps\nodejs-lts\current\npm.CMD
• pnpm: 11.1.1 - C:\Users\kar\scoop\shims\pnpm.EXE
• bun: 1.3.9 - C:\Users\kar\scoop\shims\bun.EXE
• browser: Chrome 148.0.7778.168 (Official Build) (64-bit)

other info:

• @tanstack/react-router: 1.169.2
• @tanstack/react-start: 1.167.65
• wrangler: 4.92.0
• @cloudflare/vite-plugin: 1.37.1

Additional context

No response

Reproduce the failure from the linked minimal repository by following the setup steps and running pnpm run dev-web after adding the plugin in apps/readest-app/vite.config.ts. Start with workers/runner-worker/index.js:107 and the TanStack Start createStartHandler frames shown in the stack trace. Done means the development server starts and handles requests without the TypeError.