Expose structuredClone and DOMException globally - #58736
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Summary: Install `DOMException` and `structuredClone` lazily during React Native environment setup so they are available without imports, matching their Web API placement. Add Flow and TypeScript global declarations, including the `DOMException` constants exposed by the implementation. Changelog: [General][Added] - Expose `structuredClone` and `DOMException` as global Web APIs Differential Revision: D122331156
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Summary: Install `DOMException` and `structuredClone` lazily during React Native environment setup so they are available without imports, matching their Web API placement. Add Flow and TypeScript global declarations, including the `DOMException` constants exposed by the implementation. Changelog: [General][Added] - Expose `structuredClone` and `DOMException` as global Web APIs Differential Revision: D122331156
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Summary: Compare React Native structuredClone behavior with ungap/structured-clone and port the applicable upstream coverage. Add support for ArrayBuffer, DataView, typed arrays, boxed BigInt values, Error subclasses, deeply cloned causes, and safe __proto__ data properties. Serialization-only and JSON/lossy tests remain out of scope because React Native exposes a single-step cloning API. The comparison dependency and benchmark cases were used only to collect the results below and are not shipped with React Native. Before — React Native implementation before this change: ### structuredClone (mode 🚀) ### | (index) | Task name | Latency avg (ns) | Latency med (ns) | Throughput avg (ops/s) | Throughput med (ops/s) | Samples | | ------- | ------------------------ | ----------------- | ---------------- | ---------------------- | ---------------------- | ------- | | 0 | 'clone a string' | '338.62 ± 0.05%' | '330.00 ± 9.00' | '3014547 ± 0.05%' | '3030303 ± 84962' | 2953184 | | 1 | 'clone a basic array' | '1587.6 ± 10.36%' | '1353.0 ± 19.00' | '734465 ± 0.42%' | '739098 ± 10235' | 638616 | | 2 | 'clone a basic object' | '1344.2 ± 8.81%' | '1172.0 ± 20.00' | '828917 ± 0.33%' | '853242 ± 14813' | 743963 | | 3 | 'clone a complex object' | '3370.6 ± 0.60%' | '3255.0 ± 40.00' | '304183 ± 0.02%' | '307220 ± 3822' | 296680 | After — React Native compared with ungap/structured-clone: ### structuredClone (mode 🚀) ### | (index) | Task name | Latency avg (ns) | Latency med (ns) | Throughput avg (ops/s) | Throughput med (ops/s) | Samples | | ------- | -------------------------------------- | ----------------- | ----------------- | ---------------------- | ---------------------- | ------- | | 0 | 'React Native: clone a string' | '348.44 ± 0.08%' | '331.00 ± 1.00' | '2927181 ± 0.04%' | '3021148 ± 9155' | 2869970 | | 1 | 'ungap: clone a string' | '2037.4 ± 11.17%' | '1592.0 ± 50.00' | '617833 ± 0.09%' | '628141 ± 19947' | 490832 | | 2 | 'React Native: clone a basic array' | '1460.2 ± 8.39%' | '1282.0 ± 20.00' | '775137 ± 0.42%' | '780031 ± 12362' | 684824 | | 3 | 'ungap: clone a basic array' | '5112.8 ± 0.81%' | '4718.0 ± 111.00' | '205586 ± 0.08%' | '211954 ± 5107' | 195589 | | 4 | 'React Native: clone a basic object' | '1373.8 ± 8.58%' | '1152.0 ± 20.00' | '842837 ± 0.46%' | '868056 ± 15337' | 727910 | | 5 | 'ungap: clone a basic object' | '8853.2 ± 0.76%' | '8253.0 ± 141.00' | '117562 ± 0.05%' | '121168 ± 2106' | 112954 | | 6 | 'React Native: clone a complex object' | '3539.4 ± 0.55%' | '3456.0 ± 50.00' | '288368 ± 0.02%' | '289352 ± 4248' | 282537 | | 7 | 'ungap: clone a complex object' | '21498 ± 0.72%' | '20080 ± 301.00' | '48208 ± 0.09%' | '49801 ± 755' | 46516 | The benchmark shows no material regression in the existing implementation and React Native remains faster than ungap/structured-clone across all scenarios. Changelog: [General][Added] - Add ArrayBuffer, DataView, typed array, boxed BigInt, and Error subclass support to structuredClone Differential Revision: D122156629
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Summary: Install `DOMException` and `structuredClone` lazily during React Native environment setup so they are available without imports, matching their Web API placement. Add Flow and TypeScript global declarations, including the `DOMException` constants exposed by the implementation. Changelog: [General][Added] - Expose `structuredClone` and `DOMException` as global Web APIs Reviewed By: javache Differential Revision: D122331156
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Summary:
Install
DOMExceptionandstructuredClonelazily during React Native environment setup so they are available without imports, matching their Web API placement. Add Flow and TypeScript global declarations, including theDOMExceptionconstants exposed by the implementation.Changelog:
[General][Added] - Expose
structuredCloneandDOMExceptionas global Web APIsReviewed By: javache
Differential Revision: D122331156