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Migrate jsc-android to mavenCentral #47972

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Migrate jsc-android to mavenCentral #47972

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Kudo
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@Kudo Kudo commented Nov 26, 2024

Summary:

Since people mostly use Hermes, it doesn't make sense to download jsc-android from npm even when jsc is not used. This PR migrates the jsc-android to mavenCentral. The new jsc-android supports Android 16KB memory page sizes and packaged by prefab.
Relevant PRs:

Changelog:

[ANDROID] [CHANGED] - Migrate jsc-android to mavenCentral

Test Plan:

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@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. Contributor A React Native contributor. p: Expo Partner: Expo Partner labels Nov 26, 2024
@Kudo Kudo marked this pull request as ready for review November 27, 2024 15:34
@facebook-github-bot facebook-github-bot added the Shared with Meta Applied via automation to indicate that an Issue or Pull Request has been shared with the team. label Nov 27, 2024
@NickGerleman
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Love this change!

@cortinico will probably want to take a look at this, but is on PTO and will be back soon.

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Side-note, IIRC JSCRuntime::createWeakObject secretly returns strong refs, which is really sketch, because I think new arch does actually create weak refs in places? @javache has been porting some bits over to JSC where new arch relies on it though like Native State I remember. I sometimes worry a bit about the continued support where Meta isn't really testing with JSC anymore, and whether there is a path to deprecating it.

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Kudo commented Nov 27, 2024

cool thanks for the note. i was just waiting for Nico coming back.

JSCRuntime::createWeakObject secretly returns strong refs

would be good to know more about this. does that happen on ios or just jsc-android only? if it happens on ios, it would be tough because we have no way to touch jsc on ios.

I sometimes worry a bit about the continued support where Meta isn't really testing with JSC anymore, and whether there is a path to deprecating it.

totally makes sense. i had some thought for this and would write a RFC for lean core of jsc.

cortinico
cortinico reviewed Nov 28, 2024
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...lugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/utils/DependencyUtils.kt Outdated Show resolved Hide resolved
packages/helloworld/android/app/build.gradle
@@ -81,14 +81,14 @@ def enableProguardInReleaseBuilds = false
* The preferred build flavor of JavaScriptCore (JSC)
*
* For example, to use the international variant, you can use:
* `def jscFlavor = 'org.webkit:android-jsc-intl:+'`
* `def jscFlavor = "io.github.react-native-community:jsc-android-intl:2026004.+"`
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Q: Do we still need a JSC flavor? Can we just have a single string/flavor for it?

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just to keep it as backward compatible for a while. in the future we can remove this entirely

packages/react-native/ReactCommon/jsc/CMakeLists.txt Outdated Show resolved Hide resolved
packages/react-native/ReactCommon/jsc/CMakeLists.txt Outdated Show resolved Hide resolved
@cortinico
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BTW this is awesome!

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Kudo commented Nov 28, 2024

side note: the proposing RFC to move away JSC from core react-native-community/discussions-and-proposals#836

@Kudo Kudo mentioned this pull request Nov 28, 2024
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Kudo added a commit to react-native-community/jsc-android-buildscripts that referenced this pull request Nov 28, 2024
@Kudo
fix: move prefab headers inside JavaScriptCore folder (#186)
31b634b 
# Why

following up facebook/react-native#47972 (comment)

# How

move prefab headers into `JavaScriptCore/` directory, so that `#include <JavaScriptCore/JavaScript.h>` in JSCRuntime will not break. this also simulates how JavaScriptCore.framework works.
@Kudo Kudo mentioned this pull request Nov 29, 2024
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@Kudo Kudo requested a review from cortinico November 29, 2024 07:50
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