StoreKit + SwiftUI Previews - No such module '_StoreKit_SwiftUI'

Same here on Xcode 12.0 beta 5 (12A8189h) with my App PDF Archiver.

I'm getting this one as well. I filed a feedback for it FB8523578.

To reproduce:

Code Block 
import SwiftUI
import StoreKit
struct ContentView: View {
  var body: some View {
    Button(action: {
      SKStoreReviewController.requestReview()
    }, label: {
      Text("Request a review")
    })
  }
}

There's a temporary fix, and hopefully a permanent one is coming in the next version of Xcode.

Add the following build setting to your affected target(s) / project(s).

Code Block 
Architectures
	Excluded Architectures
		Debug
			Simulator - iOS 14.0 SDK arm64

As a note, this bug is still present on Xcode 12 Beta 6. I believe it was just discovered by Apple Engineers on social media in the last day or so, so maybe it will make it into the next release.

Check your 'Build Active Architecture Only' build settings. You probably want for everything but release configuration to be set to 'Yes'.

Sounds like when you are building for your simulator, (assuming you are on intel Mac), your project is building the App for Intel and arm64 architecture. My guess is that your dependency code, (pod project build settings), has 'Build Active Architecture Only' set to 'Yes', and so is only building for Intel architecture, and hence you get the can't find module because yeah, it's not built for current architecture which is Intel when deploying to simulator.

This might help somebody