☂️ Help us Kotlin-ify React Native - Round 3 #50513

mateoguzmana · 2025-04-07T10:07:38Z

☂️ Help us Kotlin-ify React Native - Round 3

Hey all 👋
After the successful second round, we're back with another round of tasks to help us improve Kotlin support in React Native core. In this stage we are looking for help to migrate a few more files to Kotlin.

How to work

If you wish to grab one of the tasks, you should:

Verify that the task is not claimed yet.
Comment here that you claim a task.
Start working on the task. Testing instructions are below.
Send the PR for review. Ping @mateoguzmana, @cortinico or @mdvacca for a review.
You can’t claim more than one task at a time.
If you’re not completing the task within a week, we’ll release it for the next contributor.

Code formatting

Please use KtFmt to format Kotlin classes.
You can use the web UI to reformat directly from the browser.

Migrating files to Kotlin

Please act as follow:

Fork and clone the repo
Verify that RN-Tester, our reference app, runs with yarn && yarn android from the root folder
Migrate the file to Kotlin
Verify that RN-Tester runs again using the same command.

Other important things to take into account:

Avoid using Hungarian notation for the variables when the file is migrated. E.g.: mMyAwesomeProperty should become myAwesomeProperty
You might have to run the project in old architecture as well to ensure nothing breaks there when building. You can easily switch in the RN-Tester by setting newArchEnabled=false in packages/rn-tester/android/app/gradle.properties
Tap around in a few screens after migrating (helps to ensure nothing is breaking at runtime)

List of files to migrate

The text was updated successfully, but these errors were encountered:

cortinico · 2025-04-07T10:23:55Z

Let's go 🚀

devanshsaini11 · 2025-04-07T12:19:05Z

I would like to migrate: react/modules/blob/FileReaderModule.java

JatinDream11 · 2025-04-07T12:22:41Z

I would like to migrate react/modules/blob/BlobProvider.java

yasir6jan · 2025-04-07T12:29:25Z

I would like to migrate react/bridge/DynamicFromObject.java

poonamjain96 · 2025-04-07T12:32:48Z

I would like to migrate react/uimanager/ReactStylesDiffMap.java

Q1w1N · 2025-04-07T14:21:52Z

I would like to migrate react/views/textinput/ReactEditTextInputConnectionWrapper.java

BogiKay · 2025-04-07T14:23:57Z

I'd like to migrate react/bridge/DynamicFromArray.java

artus9033 · 2025-04-07T14:25:54Z

Hello, I'd like to migrate react/bridge/DynamicFromMap.java

Edit: tracked in #50597

rohitverma-d11 · 2025-04-07T16:02:10Z

Hello, I'd like to migrate react/runtime/ReactLifecycleStateManager.java

riteshshukla04 · 2025-04-07T16:17:20Z

react/bridge/UiThreadUtil.java

Can you assign me this @mateoguzmana

gouravkhunger · 2025-04-07T16:28:07Z

Hi @mateoguzmana I could help with react/views/text/frescosupport/FrescoBasedReactTextInlineImageSpan.java

Summary: Rewrite of JavaModuleWrapper from Java to Kotlin in scope of #50513 ## Changelog:  [ANDROID] [CHANGED] - Migrated JavaModuleWrapper to Kotlin Pull Request resolved: #50882 Test Plan: Test RNTester using old arch. SampleLegacyModule is the one I've used, it needs to be enabled for old arch though (RNTesterApplication.kt -> getPackages & getReactModuleInfoProvider). I may enable SampleLegacyModule for old arch to make testing easier. mateoguzmana It breaks on `getDynamic` on old arch, but I could filter these from examples or add some fallback in SampleLegacyModule.kt for old arch. Reviewed By: cortinico Differential Revision: D73576099 Pulled By: javache fbshipit-source-id: c940be27133258fa589571a600435fa478e6b51e

Summary: Rewrite of JSBundleLoader from Java to Kotlin in scope of #50513 ## Changelog: [ANDROID] [CHANGED] - Migrated JSBundleLoader to Kotlin <!-- Help reviewers and the release process by writing your own changelog entry. Pick one each for the category and type tags: [ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message For more details, see: https://reactnative.dev/contributing/changelogs-in-pull-requests Pull Request resolved: #50911 Test Plan: Tested using RNTester app, on both old and new arch, and tested by navigating to multiple pages Reviewed By: cortinico Differential Revision: D73649145 Pulled By: javache fbshipit-source-id: 7ef1fc1ea1c53a8b914ae1aada1966e64b4c3d80

l2hyunwoo · 2025-04-26T11:56:10Z

It seems that there are files that need to be migrated to Kotlin in ReactAndroid pacakge.
I would like to ask if it is possible to modify files that are not listed in the issue.

Summary: Rewrite of the Inspector class from Java to Kotlin in scope of #50513 ## Changelog: [ANDROID] [CHANGED] - Migrated Inspector to Kotlin Pull Request resolved: #50947 Test Plan: Tested using RNTester app, on both old and new arch, and tested by navigating to multiple pages Reviewed By: cortinico Differential Revision: D73767386 Pulled By: javache fbshipit-source-id: e0098568aa0ed9863503e206a88d3b171c8f9966

deepak0001631 · 2025-04-29T01:20:07Z

Hi, let's contribute, any pending files please assign it to me.

Summary: This PR aims to migrate ViewGroupManager to kotlin as part of #50513 ## Changelog: [ANDROID][CHANGED]Migrate ViewGroupManager to kotlin Pull Request resolved: #50895 Test Plan: Tested with RN tester with old and new arch Reviewed By: javache Differential Revision: D73770843 Pulled By: cortinico fbshipit-source-id: 45959a8bf512b3590ca8bc64dac281e13fa41ca3

SGamrekelashvili · 2025-05-02T13:46:47Z

Hello, if there will be anything just mention me, It would be a pleasure to contribute.

yogeshpaliyal · 2025-05-02T14:03:33Z

Would be happy to pick other files in future if there are new files required the java to kotlin migration.

Xintre · 2025-05-02T22:54:08Z

Hi @mateoguzmana, I have raised a PR: #51085

raghu1286 · 2025-05-02T23:06:10Z

Hi, I would like to contribute, pls assign to me any new files that require migration, thanks!

rEhan0771 · 2025-05-05T10:42:21Z

Hi, is there any thing for me , let me know , i would like to contribute.

mwx27 · 2025-05-06T12:12:59Z

Hi, I am also eager to contribute

migueldaipre · 2025-05-08T13:04:54Z

Hey @mateoguzmana, You can pass on my task, I won't be able to do it. So sorry for not replying sooner!

SGamrekelashvili · 2025-05-08T13:12:59Z

@mateoguzmana i will do it if its possible

mateoguzmana · 2025-05-08T20:26:14Z

Hey @mateoguzmana, You can pass on my task, I won't be able to do it. So sorry for not replying sooner!

No problem at all, thanks for letting us know!

@l2hyunwoo, since you were first among the others who showed interest, I've re-assigned react/bridge/BaseJavaModule.java to you.

To everyone else — it's awesome to see so much interest! At the moment, we don’t have more files available for community contribution, but I’ll definitely try to bring this up and see if there is another initiative to get more folks involved somewhere in the future. :)

shabeerv · 2025-05-13T07:18:58Z

Hi,

I can pick the migration for this file react/LazyReactPackage.java as I can see it has no activity for the past week

Xintre · 2025-05-13T08:09:40Z

Hi @mateoguzmana, I have applied changes from cr: #51085

gustavoabel · 2025-05-14T00:22:56Z

Hi @mateoguzmana JavaScriptModuleRegistry has already been migrated by @fabriziocucci , I didn't understand why he migrated without even having the file signed for him, but it's already done.

#51164

fabriziocucci · 2025-05-14T10:15:12Z

Hey @gustavoabel, apologies for taking over the conversion of that particular file, it was definitely unintentional, I didn't notice it was assigned already! 🙏

ai-dev-official · 2025-05-24T11:22:49Z

Is this issue open? If yes, can I pick this up? Are there any specific guidelines or community I should follow?

Josetic224 · 2025-05-29T11:38:50Z

I would love to work on this Issue

mateoguzmana added Needs: Triage 🔍 and removed Needs: Triage 🔍 labels Apr 7, 2025

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react-native-bot added Needs: Author Feedback Needs: Repro This issue could be improved with a clear list of steps to reproduce the issue. labels Apr 7, 2025

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mateoguzmana added ☂️ Umbrella To label issues that serve as coordination point and drivers for tasks in the react-native repo Good first issue Interested in collaborating? Take a stab at fixing one of these issues. Help Wanted Issues ideal for external contributors. labels Apr 7, 2025

cortinico changed the title ~~DRAFT – ☂️ Help us Kotlin-ify React Native tests - Round 3~~ ☂️ Help us Kotlin-ify React Native tests - Round 3 Apr 7, 2025

cortinico pinned this issue Apr 7, 2025

mateoguzmana changed the title ~~☂️ Help us Kotlin-ify React Native tests - Round 3~~ ☂️ Help us Kotlin-ify React Native - Round 3 Apr 7, 2025

yogeshpaliyal mentioned this issue Apr 24, 2025

refactor: Rewrite JSBundleLoader from Java to Kotlin #50911

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Xintre mentioned this issue May 2, 2025

refactor: migrated file LazyReactPackage to Kotlin #51085

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mateoguzmana unpinned this issue May 8, 2025

l2hyunwoo mentioned this issue May 9, 2025

[kotlinify] Kotlinify BaseJavaModule #51207

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☂️ Help us Kotlin-ify React Native - Round 3 #50513

☂️ Help us Kotlin-ify React Native - Round 3 #50513

Comments

mateoguzmana commented Apr 7, 2025 • edited by fabriziocucci Loading Uh oh! There was an error while loading. Please reload this page.

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☂️ Help us Kotlin-ify React Native - Round 3

How to work

Code formatting

Migrating files to Kotlin

Other important things to take into account:

List of files to migrate

cortinico commented Apr 7, 2025

Uh oh!

devanshsaini11 commented Apr 7, 2025

Uh oh!

JatinDream11 commented Apr 7, 2025

Uh oh!

yasir6jan commented Apr 7, 2025

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poonamjain96 commented Apr 7, 2025

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Q1w1N commented Apr 7, 2025

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BogiKay commented Apr 7, 2025

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l2hyunwoo commented Apr 26, 2025

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SGamrekelashvili commented May 2, 2025

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yogeshpaliyal commented May 2, 2025

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Xintre commented May 2, 2025

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raghu1286 commented May 2, 2025

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rEhan0771 commented May 5, 2025

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mwx27 commented May 6, 2025

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migueldaipre commented May 8, 2025

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SGamrekelashvili commented May 8, 2025

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mateoguzmana commented May 8, 2025

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shabeerv commented May 13, 2025

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Xintre commented May 13, 2025

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gustavoabel commented May 14, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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fabriziocucci commented May 14, 2025

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ai-dev-official commented May 24, 2025

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Josetic224 commented May 29, 2025

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mateoguzmana commented Apr 7, 2025 •

edited by fabriziocucci

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artus9033 commented Apr 7, 2025 •

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riteshshukla04 commented Apr 7, 2025 •

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gustavoabel commented May 14, 2025 •

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