feat: stateless variants

[jpudysz]

Summary

This is another attempt to simplify styles and useVariants implementation. This should address multiple issues like:

• TextInput width applied by a variant will shrink after input is received #458 -> Variants will be stateless
• [v3] explicitly need to use styles for a variant to be detected #456 -> Variants can be used with any prefix (object)
• [v3] - Improvement for babel plugin detection #436 -> part of this task
• HMR - WeakSet key must be an object while exporting HostObject from file expo/expo#33670 -> Expo CLI issue

Also this should work now:

console.log(styles) // styles without variants

styles.useVariants({...})

console.log(styles) // styles with variants

And other issues with variants reported by the community.

Edit, this PR also addresses:

• [v3] Multiple style arrays can no longer be passed to already styled children #450 - restore passing nested arrays as styles
• [v3] Add fallback mechanism for Unistyles not bound! error #438 - no more Unistyles not bound! error
• [v3] - Expo Link with asChild breaks Unistyles C++ state #432 - Unistyle will be able to accept any RN style in any shape
• [V3] ios crash, when using StyleSheet from unistyles. moving back to react-native fixes it. #466 - unmounting some nodes manually
• [v3] Importing StyleSheet from custom library #480 - add option to register own imports that will trigger babel plugin

Most likely it will also unblock: #368

Todo:

• - POC
• - Remove HostObject, use plain JS object
• - Pass variants to ShadowRegistry
• - Support withUnistyles
• - Align web
• - Tests

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Name	Status	Preview	Comments	Updated (UTC)
react-native-unistyles-2.0	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2025 11:20am
react-native-unistyles-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2025 11:20am