Possible performance improvement of useSharedValue?

[todorone]

Either i don't understand something obvious or we can significantly improve useSharedValue performance by using null as initial value on:

react-native-reanimated/src/reanimated2/hook/useSharedValue.ts

Line 11 in b40463c

const ref = useRef<SharedValue<Value>>(makeMutable(init, oneWayReadsOnly));

We assign initial value if it's null on the next lines, so currently we do useless call of makeMutable(init, oneWayReadsOnly)(as we discard the result for every call except first one). makeMutable function seems do pretty heavy stuff which could be easily avoided improving hook performance and memory consumption.

[arasrezaei]

Great topic,
Any benchmarks?

[tomekzaw]

See #3199.