[Expo] ERROR TypeError: Super expression must either be null or a function, js engine: hermes

[geoffcfchen]

Describe the bug

I am using the Expo managed workflow and EAS build. After following the installation instructions from (https://docs.livekit.io/home/quickstarts/expo/), I encountered an error. Specifically, when I import { registerGlobals } from @livekit/react-native, I receive the following error:

ERROR TypeError: Super expression must either be null or a function, js engine: hermes

Expected behavior

No error after following installation instructions (https://docs.livekit.io/home/quickstarts/expo/)

Screenshots

Device Info:

• Device: iPhone 16
• OS: 18.2

Dependencies Info (please reference your package-lock.json or yarn.lock file):

packapge.json

  "dependencies": {
    "expo": "~50.0.20",
    "@config-plugins/react-native-callkeep": "^7.0.0",
    "@config-plugins/react-native-pdf": "7.0.0",
    "@config-plugins/react-native-webrtc": "^8.0.0",
    "@livekit/react-native": "^2.5.0",
    "@livekit/react-native-expo-plugin": "^1.0.0",
    "@livekit/react-native-webrtc": "^125.0.6",

app.json

 "plugins": [
  "@config-plugins/react-native-webrtc",
  "@config-plugins/react-native-callkeep",

Additional context
Add any other context about the problem here.

[geoffcfchen]

@davidliu thanks for acting on this error. is there any work around for this issue or i can downgrade the version of livekit? Thanks again for the advice.

[davidliu]

Planning to push a fix in a day or two.

If you're not using E2EE, you should be able to just use the previous version of the SDK and @livekit/react-native-webrtc.

[geoffcfchen]

Thank you @davidliu Just use a patch to fix it temporarily! Thank you so much for quickly fixing the problem and submitting the pull request (so I know how to fix it).

[davidliu]

@geoffcfchen can you confirm that it works for you? This didn't seem to error for me so I can't repro it.

[geoffcfchen]

@davidliu Yes.

After modifying this line from

import { Event, EventTarget, defineEventAttribute } from 'event-target-shim';

to

import { Event, EventTarget, defineEventAttribute } from 'event-target-shim/index';

the error is gone.

[davidliu]

Fixed in 2.5.1.