Headless JS is very useful for running background jobs and it would be nice if it worked for iOS as well.
It is already supported for Android: https://facebook.github.io/react-native/releases/next/docs/headless-js-android.html
this is a must
I really need this feature in my iOS app
same requirement in ios
We also need the headless JS execution for iOS. I implemented a proof of concept for iOS which worked quite ok. Initial spin-up-time was ~1sec but after that the tasks were executed in ~10ms. Memory consumption was ~25mb extra.
There seems to be no issue for headless JS at the github repo. And this feature request here is not 'In Progress' so i guess the core team is not working on this right now?
@Noil: Can share the work you had done? I'm interested in implement the feature.
@Breno Rodrigues: Sure, have a look at my fork at https://github.com/NoilPaw/react-native/tree/headless-ios
To use headless execution you just have to initialize the Libraries/Headless/RCTHeadlessTaskController.m and then use executeTask to perform the RCTHeadlessTask. There are some TODOs in the code that needs love. First of all there should be tests. I am happy for any help implementing the lasts steps needed to make it a solid headless JS.
@Noil: Great work! Did you get any response from the core team on if this PR would be merged?
@Viktor Eriksson: I forwarded your question to a core developer of RN. But there has to be done some stuff, before it could get merged. Please contact me, if you want to contribute to this feature.
@Noil: 👍
@Noil: This is a critical feature for me and my team and I'd love to help implementing it! Could you get in touch with me through Github?
@Niclas Nilsson: Your contribution is very welcome, Niclas. I just sent you an email.
@Noil: Thank you! Will be working in some features to an upcoming and such feature is a must since simplify lots of things
Will be glad to help implement instead do a specialized code (that works only in the company's app)
+1, Would be helpful. Looking forward
This is necessary for designing Enterprise applications on IOS
Apple won't allow this. Use iOS background-fetch instead.
@Rob Moorman 🚀: I think Headless JS will be as legit to run in background as native code. Of course it won't magically allow us to execute stuff in background without termination. But i think if you have a valid UIBackgroundMode you can execute headless JS within its borders.
Oh yes! Please!
What does the "headless" mean in "headless js"?
@Michael Leung: headless means it does not require a foreground view to run
@Bhaskar Murthy: Ok, so is it like running "node script.js" in your terminal? Not sure what you mean by foreground.
@Michael Leung: it means the app is running, but not visible and in focus
@Michael Leung: running tasks without the UI showing
It would be a very useful feature!
Please add support iOS
This feature would be very useful,necessary for enterprise apps
Must have.
We need this guys!!
+1 would be awesome!!
Almost every IOS developer wants it who uses react-native
It will definitely be very useful! What are the steps to make it possible?
This is a Must!
For periodic tasks (e.g. background data sync every ~15 mins), I've put together a library that works with what's possible in iOS's Background Fetch and RN Android's Headless JS. It supports scheduling a task across both with a single API: https://github.com/jamesisaac/react-native-background-task
Background Fetch is a lot more restrictive than Headless JS, so the functionality is mostly limited to what the former allows.
Can this be implemented on iOS? If I remember correctly apple imposes restrictions on background tasks and there isn't a "true" background process. That is, you can't do something like continually report data back to a server at specific times. iOS's background fetch will decide when that is. Point being you won't have true headless JS. https://www.objc.io/issues/5-ios7/multitasking/
We need this
It's very useful and a must
It's very useful and a must
This is a must have feature, I wonder why RN doesn't have it yet!
👍
It would be a very useful feature!