Hermes branch running JSC on iOS throws Properties can only be defined on Objects from realm/lib/extensions.js

[kraenhansen]

Trying to upgrade to 10.20.0-beta.1 but it won't even let me start the app on iOS (10.20.0-alpha.2 worked fine). Note that I'm not using Hermes on iOS (:hermes_enabled => false) but I am using it on Android.

I'm getting Properties can only be defined on Objects from realm/lib/extensions.js on line 364:

Object.defineProperties(
      realmConstructor.App.Sync.Subscriptions,
      getOwnPropertyDescriptors(subscriptionsMethods.static),
    );

Originally posted by @cristianoccazinsp in https://github.com/realm/realm~~js/issues/3940#issuecomment~~1027264594

[kneth]

Partially fixed by #4298

[cristianoccazinsp]

Any ETA for the next beta release?

[juhasuni]

This bug affects 10.13.0 also, however I only discovered the issue when starting the app using "My Mac" as the target. iOS simulator seems to run fine.

Downgrading to 10.12.0 solved the issue.

[cristianoccazinsp]

Was this resolved with Beta 2 or not yet?

[kraenhansen]

We havn't been able to reproduce this yet.

[cristianoccazinsp]

Odd, I consistently get the error by just upgrading to beta1 from alpha2 and doing no code changes.

[kraenhansen]

@cristianoccazinsp did you clear "the usual suspects"? Derived data, Pods, etc.

[takameyer]

I'll add my obligatory xcode cleanup commands here:

rm -rf ios/Pods
rm ios/Podfile.lock
rm -rf ~/Library/Developer/Xcode/DerivedData
npx pod-install

[cristianoccazinsp]

I did not clear everything, no, just the regular XCode clean.

[cristianoccazinsp]

Looks like after doing a cleanup and installing beta2, the issue went away.

[kraenhansen]

@cristianoccazinsp thats great news!
Thanks for trying it out and submitting your findings - this is a great help for us!