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Add unstable ReferenceStateWrapper API #50921

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NickGerleman
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Summary:
This adds the ability to represent Fabric State sent to Java View managers as a raw JNI reference. This is used by Facsimile to tell a component to mount a layout, previously generated during measurement.

This API is consciously well hidden (in comparison to MapBuffer which is fairly public). To use it:

  1. The concrete state data representation must implement a method named getJNIReference() that returns an fbjni ref
  2. The Java view manager must cast the StateWrapper to an internal ReferenceStateWrapper type, not exposed outside of React Native internals

Changelog: [Internal]

Reviewed By: alanleedev

Differential Revision: D73159146

Summary:
We construct this from JNI, which doesn't care about visibility, and then only want to expose `StateWrapper` as the public interface.

Changelog:
[Android][Removed] - Make StateWrapperImpl Internal

Reviewed By: Abbondanzo

Differential Revision: D73161592
Summary:
This adds the ability to represent Fabric State sent to Java View managers as a raw JNI reference. This is used by Facsimile to tell a component to mount a layout, previously generated during measurement.

This API is consciously well hidden (in comparison to MapBuffer which is fairly public). To use it:
1. The concrete state data representation must implement a method named `getJNIReference()` that returns an fbjni ref
2. The Java view manager must cast the `StateWrapper` to an internal `ReferenceStateWrapper` type, not exposed outside of React Native internals


Changelog: [Internal]

Reviewed By: alanleedev

Differential Revision: D73159146
@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. p: Facebook Partner: Facebook Partner labels Apr 24, 2025
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This pull request was exported from Phabricator. Differential Revision: D73159146

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This pull request has been merged in 75a01c3.

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