@tanstack/react-start v1.134.7 causes import error with use-sync-external-store

Which project does this relate to?

Start

Describe the bug

When I upgrade to to v1.134.7 of @tanstack/react-start, I get a runtime error if I view a react component that imports tanstack-store. I personally triggered this by using tanstack-form which uses store underneath.

tanstack-store uses use-sync-external-store which is only published as cjs.

I was able to replicate this by cloning the start-basic template and adding tanstack forms.

The issue goes away when I switch to "@tanstack/react-start": "1.134.6",

Specifically this commit

Your Example Website or App

https://github.com/EthanShoeDev/import-bug-repro-tanstack-start

Steps to Reproduce the Bug or Issue

Clone the start-basic template
Add tanstack-forms
Add any form to any route and view that route.

Expected behavior

The module loads correctly

Screenshots or Videos

Platform

Router / Start Version: [e.g. 1.121.0]
OS: [e.g. macOS, Windows, Linux]
Browser: [e.g. Chrome, Safari, Firefox]
Browser Version: [e.g. 91.1]
Bundler: [e.g. vite]
Bundler Version: [e.g. 7.0.0]

Additional context

Browser console logs:

hook.js:608 SyntaxError: The requested module '/node_modules/.pnpm/use-sync-external-store@1.6.0_react@19.2.0/node_modules/use-sync-external-store/shim/with-selector.js?v=d9f62913' does not provide an export named 'useSyncExternalStoreWithSelector' (at index.js?v=d9f62913:1:10)

The above error occurred in the <Lazy> component.

React will try to recreate this component tree from scratch using the error boundary you provided, CatchBoundaryImpl.

same

Thanks for writing this up, affecting me too

I facing this problem too thanks.

Also getting this same error when importing TanStack Form in a TanStack start project:

import { useForm } from '@tanstack/react-form'

Using latest versions:

@tanstack/react-start 1.134.7
@tanstack/react-router 1.134.4
@tanstack/react-form 1.23.8

Rolling back "@tanstack/react-start" from 1.134.7 --> 1.134.6 fixes the issue for me.

Same here!

I was still facing this error in my environment.
I suspect it might be related to pnpm workspace, though I'm not entirely sure about the root cause.
As a quick workaround, I manually ran pnpm install use-sync-external-store and added import "use-sync-external-store" somewhere in my code. This resolved the error for me on the latest version.

I have the same issue when using clerk

I have the same issue when using clerk

Same. The other day Clerk was working though I don't remember seeing the error. Now it's not (SignInButton/SignUpButton do nothing on click). Is yours still working?

@flyingduck92

@flyingduck92 @dominictobias Are you still having issues with the Clerk TanStack SDK? Here's a temporary solution if you're still having issues with use-sync-external-store.

SignInButton/SignUpButton do nothing on click

@dominictobias Are you seeing any console errors? I'm guessing you don't have a sign in and sign up page configured

@wobsoriano

@wobsoriano I fixed it by not following the official docs, but the github quick start project at https://github.com/clerk/clerk-tanstack-react-start-quickstart/
the vite.config setup should be mentioned on the official docs and the github project starter, but there is no mention on official docs about vite.config setup

@wobsoriano I fixed it by not following the official docs, but the github quick start project at https://github.com/clerk/clerk-tanstack-react-start-quickstart/ the vite.config setup should be mentioned on the official docs and the github project starter, but there is no mention on official docs about vite.config setup

Thanks, this fixed it for me!

@ConanMcN

@ConanMcN Glad It helps. Happy coding sir

Also getting this same error when importing TanStack Form in a TanStack start project:

import { useForm } from '@tanstack/react-form'

Using latest versions:
* @tanstack/react-start 1.134.7

* @tanstack/react-router 1.134.4

* @tanstack/react-form 1.23.8
Rolling back "@tanstack/react-start" from 1.134.7 --> 1.134.6 fixes the issue for me.

I'm experiencing this issue as well on:

    "@tanstack/react-form-start": "^1.28.3",
    "@tanstack/react-router": "^1.163.2",
    "@tanstack/react-start": "^1.163.2",

I got it working by adding the following to vite.config.ts. This is based on the changes introduced in #5726.

 optimizeDeps: {
    include: ["@tanstack/react-form-start"],
  },

@flyingduck92

FYI @flyingduck92 @ConanMcN @dominictobias we released Clerk Core 3 which includes the migration from swr to @tanstack/react-query meaning this error is gone.

Also getting this same error when importing TanStack Form in a TanStack start project:
import { useForm } from '@tanstack/react-form'
Using latest versions:
* @tanstack/react-start 1.134.7

* @tanstack/react-router 1.134.4

* @tanstack/react-form 1.23.8
Rolling back "@tanstack/react-start" from 1.134.7 --> 1.134.6 fixes the issue for me.
I'm experiencing this issue as well on:
    "@tanstack/react-form-start": "^1.28.3",
    "@tanstack/react-router": "^1.163.2",
    "@tanstack/react-start": "^1.163.2",
I got it working by adding the following to vite.config.ts. This is based on the changes introduced in #5726.

optimizeDeps: {
include: ["@tanstack/react-form-start"],
},

This works for me.

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@tanstack/react-start v1.134.7 causes import error with use-sync-external-store #5717

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@tanstack/react-start v1.134.7 causes import error with use-sync-external-store #5717

Description

Which project does this relate to?

Describe the bug

Your Example Website or App

Steps to Reproduce the Bug or Issue

Expected behavior

Screenshots or Videos

Platform

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bitpickle commented on Nov 2, 2025

inaridiy commented on Nov 28, 2025

inaridiy commented on Nov 28, 2025

flyingduck92 commented on Jan 17, 2026

dominictobias commented on Jan 28, 2026

wobsoriano commented on Jan 28, 2026

flyingduck92 commented on Jan 29, 2026

ConanMcN commented on Mar 2, 2026

flyingduck92 commented on Mar 3, 2026

sleeyax commented on Mar 4, 2026

wobsoriano commented on Mar 4, 2026

sithu-khant commented on Jun 25, 2026

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