Will reanimated 2 have v8 support?

[shamilovtim]

Just wondering if you plan to support the v8 engine? AFAIK it's gaining popularity due to outperforming Hermes on Android.

[andreialecu]

There's another discussion about v8 here: #1913

[mrousavy]

Krzysztof's cooking something up in #1960 🔥

[jzxchiang1]

Bump. react-native-v8 is now compatible with reanimated v2 (I tested it myself with the help of @Kudo).

Can we please get official support from reanimated as soon as possible? Thank you!

#1960 (comment)

[shamilovtim]

Bump. Is there a v8 cut in the works?

[jzxchiang1]

I hope so! v8 already fixed the blocking issue on their side.

[jzxchiang1]

For those waiting on official support, you can run

yarn add react-native-reanimated@npm:react-native-reanimated-v8@2.2.2

to get a version of reanimated that's compatible with v8. I've been using it and it works beautifully. The only issue is that it doesn't work with other libraries with native dependencies on reanimated, for example react-native-vision-camera by @mrousavy. That's because it depends on a properly configured / named reanimated AAR for v8.

I do hope reanimated can officially support v8 soon though, since all the pieces are there. The work has in fact already been done by @Kudo here; it's mostly modifying some build scripts.

Would make a big difference for v8 users, thanks!

[DrRefactor]

Are there any plans to integrate @Kudo's work regarding v8 support to reanimated repo?
@Kudo maybe you could create PR from your fork?

[shamilovtim]

Bump

[jzxchiang1]

Bump! AFAIK v8 outperforms JSC (which is outdated anyways) on almost all major benchmarks on Android. JIT v8 + reanimated v2 seems like a formula for great UXs.

[mrousavy]

Why are you comparing against JSC? Hermes is the runtime you should be comparing against, that's what RN's future is.

[jzxchiang1]

Because Hermes has even fewer ECMAScript features that I need, most notably BigInt and WebAssembly.

[jzxchiang1]

Sorry to bother, but do you guys have any plans to officially support react-native-v8?

All of the foundations are there—all you have to do is take the last two commits here and port them over into this codebase.

It would mean a lot to v8 users, which are plenty on Android. 🙏

[Kudo]

@jzxchiang1 as the latest reanimated support to build from source, it would be a fair approach to support v8 from reanimated. i'll create a pr when a get a chance.

[jzxchiang1]

Awesome! I thought reanimated always supported building from source from a developer's machine. Didn't know something had changed.

[jzxchiang1]

Let me know if you need any help!

[jzxchiang1]

@piaskowyk

[Kudo]

finally to get the integration working. open a pr at #3132. this requires react-native-v8>=1.1.0 and react-native>=0.66.0

[jzxchiang1]

Very much appreciated, thank you! It seems like you tested it on 0.67 but not 0.66 though.