Tap gesture example crashes in Expo Go

[henrymoulton]

Description

Simulator.Screen.Recording.-.iPhone.14.-.2023-11-03.at.03.07.54.mp4

Steps to reproduce

1. Copy in code from https://docs.swmansion.com/react-native-gesture-handler/docs/gestures/tap-gesture#example
2. npx create-expo-app --template
3. npx expo install react-native-reanimated react-native-gesture-handler
4. paste in code
5. tap on view
6. watch it crash

Snack or a link to a repository

https://gist.github.com/henrymoulton/3f86a2a781f7bb1c814e2ff8b8c0400a
https://snack.expo.dev/@henry12345678/courageous-green-truffles?platform=ios

Gesture Handler version

"2.12.1"

React Native version

0.72.6

Platforms

iOS

JavaScript runtime

Hermes

Workflow

Expo managed workflow

Architecture

Paper (Old Architecture)

Build type

Debug mode

Device

iOS simulator

Device model

No response

Acknowledgements

Yes

[henrymoulton]

Updated with Snack https://snack.expo.dev/@henry12345678/courageous-green-truffles?platform=ios

[m-bert]

Hi @henrymoulton! I've tested that and I have not noticed any crash. I've done it by doing the following steps:

1. npx create-expo-app --template
   1.1. blank (TypeScript)
2. npx expo install react-native-gesture-handler
3. npx expo start
   3.1. press i to run iOS simulator

I'm using simulator iPhone 15 Pro with iOS 17.0. I've also checked that on physical device with android.

Notice that I didn't use react-native-reanimated - there were some problems with babel plugin. Please check that and if there's still problem with gesture handler prepare a repo with reproduction.

[henrymoulton]

Hey @m-bert thanks for the reply and attempt to recreate :). Hmm weird, I've got a reproduction of the crash using Snack, can you verify that it crashes in the Snack provided for you?

lol.mov

[m-bert]

It does crash on snack, however we had many cases where something doesn't work on snack but works on other devices (physical, emulators/simulators) - that's why we double-check everything outside of snack.

[m-bert]

Okay, I've just got rid of that babel error. The app indeed crashed. Moreover it will crash outside of Expo Go.

This is due to Alert.alert. Our callback are workletized and there's no access to Alert on UI thread. To make this work, you would have to add .runOnJS(true) - then app won't crash. We will change it in our documentation soon.