Bug: startTransition is causing TypeError when used directly from react

[raajnadar]

React version: 18.3.1

Steps To Reproduce

Getting this error message

TypeError: Cannot read property 'add' of undefined

1. Run the code example https://snack.expo.dev/@raajnadar/swr-error-in-expo-sdk-52
2. Run android or ios, the web version works without the error
3. Click the "Call the API button" button inside the mobile app
4. Check the logs tab, when switched to axios there is no issue
5. This happens with swr because it uses startTransition internally

Link to code example:

Import like this

export const startTransition: (scope: TransitionFunction) => void =
  IS_REACT_LEGACY
    ? cb => {
        cb()
      }
    : React.startTransition

And use like this

startTransition(() =>
   setState({ data, isMutating: false, error: undefined })
)

Code from this repository https://github.com/vercel/swr/blob/1585a3e37d90ad0df8097b099db38f1afb43c95d/src/mutation/state.ts#L5-L10

The current behavior

Getting this error when startTransition used from React directly

TypeError: Cannot read property 'add' of undefined

On Expo snack the error says

Error: "Cannot read property 'add' of undefined" in TypeError: Cannot read property 'add' of undefined << at requestUpdateLane (/data/user/0/host.exp.exponent/files/.expo-internal/5cb1b0c52b8fcab94364327c83b808ee:18892:43) << at dispatchSetState (/data/user/0/host.exp.exponent/files/.expo-internal/5cb1b0c52b8fcab94364327c83b808ee:16726:33) << at anonymous (swr.mutation:12:14616)

The expected behavior

There is no TypeError,

When I tried using the startTransition from the useTransition hook the problem got solved

[eps1lon]

This looks like it's also using react-native? Does it repro with react-dom instead of react-native?

I'd inline all the relevant code of swr first. Otherwise it isn't clear for use if the issue is with 3rd party libraries or React itself

[raajnadar]

With React native web the issue is not visible, we can use the same snack demo to confirm it.

How can I or someone else figure out the issue? I gave my findings here in the issue ticket.

Some devs in an SWR ticket said this should not be an issue from SWR because the latest release was 6 months ago and the same code & SWR version works on expo SDK 51 without change in SWR itself.

Will the problem arise from the React Native core?

[raajnadar]

I can confirm this issue is not with web apps using react-dom, I will report to react native core

https://stackblitz.com/edit/vitejs-vite-u1tsbe?file=package.json

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[github-actions[bot]]

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