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Symbolicate unhandled promise rejections (#40914)
Summary: For a very long time when a promise rejects without an attached catch we get this warning screen without a correct stack trace, only some internal calls to the RN internals. <img src="https://github.com/facebook/react-native/assets/1634213/75aa7615-ee3e-4229-80d6-1744130de6e5" width="200" /> I created [an issue for discussion](react-native-community/discussions-and-proposals#718) in the react-native-community repo and we figured out it was only a matter of symbolication. While it cannot be done on release without external packages and source maps, at least while developing we can provide a symbolicated stack-trace so developers can better debug the source of rejected promise. I got the stack trace symbolicated and the correct code frame. I'm missing some help trying to display it in the warning view but at the very least I can now correctly show the line of the error and log the codeframe to the console. ## Changelog: <!-- Help reviewers and the release process by writing your own changelog entry. Pick one each for the category and type tags: [GENERAL] [FIXED] - Show correct stack frame on unhandled promise rejections on development mode. For more details, see: https://reactnative.dev/contributing/changelogs-in-pull-requests Pull Request resolved: #40914 Test Plan: I simply created a throwing function on a dummy app, and checked the output of the console and the warning view: ```ts import React from 'react'; import {SafeAreaView, Text} from 'react-native'; async function throwme() { throw new Error('UNHANDLED'); } function App(): JSX.Element { throwme(); return ( <SafeAreaView> <Text>Throw test</Text> </SafeAreaView> ); } export default App; ``` Here is the output <img src="https://github.com/facebook/react-native/assets/1634213/2c100e4d-618e-4143-8d64-4095e8370f4f" width="200" /> Edit: I got the warning window working properly: <img src="https://github.com/facebook/react-native/assets/1634213/f02a2568-da3e-4daa-8132-e05cbe591737" width="200" /> Reviewed By: yungsters Differential Revision: D50324344 Pulled By: javache fbshipit-source-id: 66850312d444cf1ae5333b493222ae0868d47056
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