chore: support rn 0.87

[Francesco-Voto]

RN 0.87 removed rn-get-polyfills.js in favor of @react-native/js-polyfills.

Summary

The idea is to check what polyfill is available and use that one

Test plan

Repack builds correctly on RN 0.87

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[dannyhw]

hey sorry for the delay, does it cause some kind of failure without this that I can use to check before/after?

[Francesco-Voto]

@dannyhw yes in rn 0.87 looks like the polyfill was moved so the code si breaking at build time. You can try to integrate ina project with rn 0.87

[Francesco-Voto]

@dannyhw I added more check based on what I noticed in a RN 0.97 project. I had to insert the alias
'react-native/src/private/featureflags/ReactNativeFeatureFlags': resolve(__dirname, 'node_modules', 'react-native', 'src', 'private', 'featureflags', 'ReactNativeFeatureFlags.js')

but this seems to be an issue with react native

[dannyhw]

thanks, I hope to get to this soon, sorry again for the delay.

[dannyhw]

@Francesco-Voto can you check the test failure?