structuredClone loses own __proto__ data properties

[OskarEichler]

Description

The React Native structuredClone polyfill copies enumerable properties with ordinary assignment. For an own __proto__ data property on an object or array, assignment invokes the inherited prototype setter: the clone's prototype is replaced and no own property is created.

Expected behavior

__proto__ should be cloned as an ordinary own enumerable/writable/configurable data property with a deeply cloned value, while the clone keeps its normal Object or Array prototype. Native structuredClone follows this behavior.

React Native Version

0.87.1 and current main

Affected Platforms

JavaScript runtime - All

[react-native-bot]

Warning

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[react-native-bot]

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