dispose() fails on HybridObject when used as HybridView prop: failed to define internal native state property

[mfazekas]

What happened?

When a HybridObject is passed as a prop to a HybridView, calling dispose() on the HybridObject during useEffect cleanup throws:

Exception in HostFunction: failed to define internal native state property

Reproduceable Code

import type { HybridView, HybridViewMethods, HybridViewProps } from 'react-native-nitro-modules'
import type { Base } from './Base.nitro'

export interface TestViewProps extends HybridViewProps {
  // ... other props
  hybridData?: Base  // HybridObject as prop
}

unction ChildWithHybridView({ hybridData }: { hybridData: Base }) {
  useEffect(() => {
    return () => {
      // THIS FAILS with "failed to define internal native state property"
      hybridData.dispose()
    }
  }, [hybridData])

  return (
    <TestView
      hybridData={hybridData}  // Pass HybridObject as prop
      // ... other props
    />
  )
}

Relevant log output

DISPOSE - calling hybridData.dispose()...
DISPOSE - ERROR: Error: Exception in HostFunction: failed to define internal native state property

Device

iOS Simulator (iPhone 16 Pro, iOS 18.x)

Nitro Modules Version

0.31.10

Nitrogen Version

No response

Can you reproduce this issue in the Nitro Example app here?

Yes, I can reproduce the same issue in the Example app here

Branch:

Steps to reproduce:

1. Apply patch to nitro repo (or checkout branch)
2. Run bun specs in packages/react-native-nitro-test
3. Run cd example && bun ios
4. Navigate to "Dispose" tab
5. Tap "Create Object" → "Hide Child"
6. Observe error in log

nitro-dispose-hybridview-reproduction.patch

Diff:
https://github.com/mrousavy/nitro/compare/main...mfazekas:nitro:bug/dispose-hybridview-issue?expand=1

Additional information

• I am using Expo
• I am using nitrogen
• I have read and followed the Troubleshooting Guide.
• I created a reproduction PR to reproduce this issue here in the nitro repo. (See Contributing for more information)
• I searched for similar issues in this repository and found none.