structuredClone accepts boxed Symbols as empty objects
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Description
Description
The React Native structuredClone polyfill correctly rejects primitive Symbols but treats boxed Symbols as arbitrary objects. structuredClone(Object(Symbol())) therefore returns {} instead of throwing, even though boxed Symbols are also not structured-cloneable.
Expected behavior
Boxed Symbols should throw DataCloneError, matching native structuredClone. The error path should not string-coerce the wrapper because Hermes throws a separate TypeError for that coercion.
React Native Version
0.87.1 and current main
Affected Platforms
JavaScript runtime - All
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at React Native's structuredClone polyfill and reproduce the issue with Object(Symbol()). Compare its behavior with native structuredClone and the existing primitive-Symbol path. Done means boxed Symbols throw DataCloneError without string-coercing the wrapper, while existing clone behavior remains unchanged.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react-native
- Domain
- mobile-dev
- Issue type
- Bug
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 72/100