Realm JavaScript v10.20.0-beta.1

[kraenhansen]

Breaking change

• Removed all code related to the legacy Chrome Debugger. Please use Flipper as debugger.

Enhancements

• Realm.writeCopyTo() now supports creating snapshots of synced Realms, thus allowing apps to be shipped with partially-populated synced databases. (#3782
• Added beta support for flexible sync (#4220).
• Adding support for passing the arrayFilters parameter when updating documents using the remote MongoDB client. (#4248)

Fixed

• Fixed "JSCRuntime destroyed with a dangling API object" assertion when reloading an app in debug mode while running with Hermes engine disabled. (#4115, since 10.20.0-alpha.0)

Compatibility

• MongoDB Realm Cloud.
• Realm Studio v11.0.0.
• APIs are backwards compatible with all previous releases of Realm JavaScript in the 10.5.x series.
• File format: generates Realms with format v22 (reads and upgrades file format v5 or later for non-synced Realm, upgrades file format v10 or later for synced Realms).

Internal

• Remove the previous implementation to the JavaScriptCore engine (in src/jsc).

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This discussion was created from the release Realm JavaScript v10.20.0-beta.1.

[ykravv]

Hey guys, thanks for the release 👏

I got lost between the issue and Hermes closed PR. Do you have insight into when it's planned to release a stable version with Hermes support or is there a roadmap for this?

[aleminkirali]

@kraenhansen Any update when we can expect stable release with Hermes? It's weird that you have v10.20.0-beta.1 then skip this and bring out stable version of v10.13.

[leecommamichael]

How is that weird?

[ianpward]

Hey @aleminkirali - Product for Realm here, while there are not too many user-facing changes in this release, to support Hermes there was a significant amount of code refactored under the hood to support this and so we plan to run a long-running beta to gather user feedback and confidence with the implementation. This will likely last several months. Of course, it's really your call if you'd like to use a beta library in your production app - and already some users do - but only you, as the app developer, can make the call on whether the performance and stability work for your app.

[leecommamichael]

This will likely last several months.

Ouch. Thanks for clarifying that timeline. This is such an awkward time as everyone migrates away from JSC.

[Acetyld]

Any idea about this release? React native is pushing hard to merging to hermes default https://reactnative.dev/blog/2022/03/15/an-update-on-the-new-architecture-rollout

[HSReact]

Not using Hermes in RN forces us to make too many compromises e.g. not being able to use reanimated 2 etc.

I hope the Realm team can deliver a stable release soon.