Breaks SwiftUI previews in a project with "Use Legacy Previews Execution"

[gerchicov-vg]

Description

I added this library via SPM. Then I added cocoapods (most of these libraries are not available via SPM):

   pod 'Google-Mobile-Ads-SDK'
   pod 'GoogleUserMessagingPlatform'
   pod 'GoogleMobileAdsMediationMintegral'
   pod 'GoogleMobileAdsMediationVungle'
   pod 'GoogleMobileAdsMediationPangle'
   
   pod 'AppLovinSDK'
   pod 'AppLovinMediationVungleAdapter'
   pod 'AppLovinMediationUnityAdsAdapter'
   pod 'AppLovinMediationGoogleAdapter'
   pod 'AppLovinMediationMintegralAdapter'
   pod 'AppLovinMediationIronSourceAdapter'
   pod 'AppLovinMediationFacebookAdapter'
   pod 'AppLovinMediationGoogleAdManagerAdapter'
   pod 'AppLovinMediationFyberAdapter'
   pod 'AppLovinMediationByteDanceAdapter'
   pod 'AppLovinMediationCSJAdapter'

Result - previews are broken because of a lot of errors with sharing-grdb:

I don't know how to fix it but I tried different combinations:
1)project + SharingGRDB only
2)then added cocoapods
3)then removed SharingGRDB
4)another project + cocoapods only (the same cocoapods)
5)examples from this repo

Previews work in every project except of the case I add SharingGRDB and cocoapods simultaneously. SharingGRDB also sometimes fails to compile with random errors so it seems to be a reason of all the problems.
I can't reproduce it with examples from this repo because they already contain workspace file and so I don't know how to add cocoapods there.

I have also tried to add GRDB separately - it works.

NOTE: Previews don't work even in screens where I didn't import SharingGRDB. And in the main project I intentionally moved SharingGRDB into a separate file and didn't use its features like @Dependency directly in screens to prevent additional problems.

Checklist

• I have determined whether this bug is also reproducible in a vanilla SwiftUI project.
• I have determined whether this bug is also reproducible in a vanilla GRDB project.
• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

SwiftUI previews work with SharingGRDB and cocoapods added to the same project. Or at least SharingGRDB is disabled for previews to avoid these problems

Actual behavior

Each preview fails to render

Reproducing project

test-sharingGRDB.zip

SharingGRDB version information

0.2.2

Sharing version information

2.5.2

GRDB version information

7.5.0

Destination operating system

and iOS simulator

Xcode version information

16.2

Swift Compiler version information

Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-darwin24.3.0

[mbrandonw]

Hi @gerchicov-vg, I'm sorry but we do not use cocoapods, and I do not believe that there is anything we can do in SharingGRDB to fix this. I'm willing to bet that this would happen with any SPM package integrated into your project.

There may be tricks to fix this, but because it's not an issue with the library I am going to convert it to a discussion. Please feel free to continue the conversation over there.

[mbrandonw]

but anyways SharingGRDB shouldn't depend on this Xcode feature.

There is nothing in SharingGRDB that makes use of "legacy preview execution." This really just seems like an Xcode bug. SharingGRDB is a very vanilla Swift package. It does not have any trickery in it.

But also, why are you using legacy preview execution? Previews work just fine without that.

[mbrandonw]

Yeah, this is definitely an Xcode bug, and this should fix it: https://github.com/pointfreeco/sharing-grdb/pull/60

[gerchicov-vg]

I need to include those cocoapods I listed above due to project requirements. They break previews and the only solution I found is to use "legacy preview execution". And I didn't find another solution to fix them.
SharingGRDB is added earlier to the same project so I faced this issue only with cocoapods added simultaneously.

And as I have already mentioned a lot of people may face the same issue because Google, Applovin and others don't even try to migrate their code to SPM.

[mbrandonw]

We just merged a fix. Want to try it out and let us know if it works for you? We will release sometime soon.

[gerchicov-vg]

@mbrandonw thanks, now it works