Develop Reference

react native app needs to be deployed on multiple store listings at once [both android and ios]

We have a SaaS platform where tenets can opt for a dedicated (white labeled) mobile apps for both platforms - Android + iOS. Programmatically its the same app cooked for multiple tenets on both ios and android platforms under different names. We want a CI/CD for both stores, meaning once we push an update to master branch of our react native app - a system should make a build and deploy to both store apps and update all android apps and ios apps automatically, how is this possible? what tools will i need?

AppCenter and Fastlane helps you to accomplish that.
AppCenter connects your repo to it's own server to automatically build and push to Google Play and App Store.
https://appcenter.ms
Fastlane used to create metadatas, versioning for apps, distribute new releases to both stores:
https://fastlane.tools

Angular & Ionic Native Android App

I am building an angular ionic application.
I need to know, when exporting the application will I get a native java/android code, or will it be exported as web pages?

Hey so on the ionic website it says "...Ionic is an HTML5 mobile app development framework targeted at building hybrid mobile apps. Hybrid apps are essentially small websites running in a browser shell in an app that has access to the native platform layer. Since Ionic is an HTML5 framework, it needs a native wrapper like Cordova or PhoneGap in order to run as a native app." So Cordova
is that browser shell or container.

You can generate an apk of your project. No web pages or native code will be generated

Can i publish android studio project on iphone app store?

I am still a beginner and I really don't know much and am working on my first app on android studio.
So is it possible to publish android studio project on iPhone App Store? If not is there any other way to do that?

You cannot publish a packaged compiled .apk Android Package file to an IOS app store. But an IPA file to IOS store
Google Play: - For Google play store you need to register for a Google play dev console account, plus a stock & rooted version of Android latest OS build phone
See this
Apple Store: - You need to have a Mac, plus an Apple developer license. A code editor like XCode, a know-how of programming language like Swift 3, an SDK toolkit & an iPhone
See Link1 and Link2.

android application is mainly build based on java program. ios application is build based on objective C.Its not because of programming language but rather due to final package its get compressed.
You can try learning xamarin cross platform native app development.
or
use ionic 2 framework. App Development based on HTML5,jss,css. Which use simple webview to display the content. That can be converted to any platform.

There is no way to do it as both have platform specific. So use their respective platform so audience can reach easily.
Mixing up of different platform caused confusion so follow each website rules.

How do I deploy an Android app with both Native and Meteor code?

I'm developing an app where the main body of the application is built in Meteor, while some of it uses services that are only available through native development. Once I'm close to deploying this on Google Play I will need to wrap up both of these sub-apps together.
Does anyone know how to do this ?
I have read how to deploy meteor apps here - https://guide.meteor.com/mobile.html
I also know that Google allows multiple APK support - https://developer.android.com/google/play/publishing/multiple-apks.html
But this is downloading different single apks for different configurations. Whereas I would like to combine both the meteor release and the native android release to work together.
Thank you.

Remember first that Meteor uses Cordova internally to wrap the (Meteor) Web App into a Hybrid App (i.e. a Native App that consists mainly of a WebView and a local server that serves your Web App directly from the mobile device).
You have plenty Meteor and Cordova tutorials and resources that explain how to build the Hybrid App for Android (and iOS), for example:
https://guide.meteor.com/mobile.html
Then, remember that once the Web App is packaged as a Hybrid App, it may access more native functionalities than an actual Web App accessed through a mobile browser online, thanks to Cordova plugins that expose native functionalities through a JavaScript API.
If the services you need are already available through a Cordova plugin, then you are good to go, simply add it to your Meteor project and you can use the corresponding JS API in your code (possibly wrapping it with Meteor.isCordova check to make sure your Web App does not crash trying to access an API that will not be available while debugging on a browser).
Your Cordova plugin may even be wrapped as a Meteor Atmosphere package. The syntax to add a Meteor package or a Cordova plugin is slightly different.
If they are not available yet, then you will have to build your own Cordova plugin. You can then specify a local path when adding it into your Meteor project.

How to deploy & publish cordova ios from VS2015

I have develop an Cordova App in vs2015 and I'm able to deploy on android, test and publish on Play Store.
So, I attach my remote iMac and compile&build ios platform but I don't find a simple and robust path for deploy.
First of all, to deploy on App Store I need to do it only from iMac... is possible to deploy directly from Win10 after build from mac?
So if it's correct I need to open the .xproject and prepare to send to app store but the .xproject change on every new deploy from VS (the remote_build create a new folder on every build).

There is a very good resource for you to see how to "Package your Cordova app so that you can publish it to a store".
You can learn how to prepare them for Android, iOS and Windows App Store publish.
Here it is at this url: Package your Cordova app so that you can publish it to a store