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Troubleshooting.md

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Troubleshooting

"Property 'Proxy' doesn't exist, js engine: hermes"

android

If Hermes is enabled in your project, you probably will see a red screen with the "Property 'Proxy' doesn't exist, js engine: hermes" message.

Quick fix: disable Hermes (not recommend).

React Native 0.63 includes v0.5.0 of hermes, wich is not compatible with this lib yet. So you could install v0.5.2-rc1 temporarily.

npm install hermes-engine@v0.5.2-rc1

using yarn:

yarn add hermes-engine@v0.5.2-rc1

And React Native React Native <= 0.62.2 includes v0.4.0 of hermes, wich is not compatible either. So you could install v0.4.2-rc1 temporarily. (since Proxy was not inside hermes before)

npm install hermes-engine@v0.4.2-rc1

using yarn:

yarn add hermes-engine@v0.4.2-rc1

https://twitter.com/HermesEngine/status/1245136667414913024

We are actively tracking the changes to Hermes to ensure support.