EAS build fails when using hermes (android) in a project with Expo-Router

[seyaobey-dev]

I'm not sure if this is bug or something wrong on my hand. That's why I'm reporting it as a discussion hoping to find some help.

EAS build fails when hermes is enabled in my app (using Expo Router). But it does not fail when I'm using the version of my app without expo-router (classic react-navigation).

[stderr] /home/expo/workingdir/build/android/app/build/generated/assets/react/release/index.android.bundle:182810:9: error: Invalid regular expression: Quantifier has nothing to repeat
[stderr]     N = /^((?<protocol>http[s]?):\/\/)?(?<host>localhost)(:(?<port>\d+))?$/;

There is an related issue in facebook hermes repo. It looks like hermes has issues with regex see here.

But then why the same project is building just fine in the version without expo-router?
(I'm willing to share the link to the repo or the eas build logs/account for further investigations. I hope this discussion find some visibility)

[EvanBacon]

Expo Router uses a lot of regex as I am a regex-absolutist. But I imagine this is a Hermes issue. If I were to guess, it's a lack of support for the named groups ?<host> which aren't directly used in Expo Router but perhaps some dependency(?)

[seyaobey-dev]

@EvanBacon Thanks for the reply. FWIW, I seem to have fixed the issue by upgrading metro and metro-source-map dependencies to 0.73.6.