Preview Build Fails in Swift Package

[ParkTaeGyu]

Description

I'm designing a multimodule project by organizing local packages myself.
I'm in the process of isolating a UI module and noticed that the Preview feature is not available inside that package.
Unusually, the preview feature is available in other modules that import the UI module.

Checklist

• I have determined whether this bug is also reproducible in a vanilla SwiftUI 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

Run Preview Success inside UI Package

Actual behavior

Build Preview Fails

Steps to reproduce

1. Make Local Package in Xcode
2. Edit Package.swift

3. In Package, Create SwiftUI View

4. Run Preview
5. Preview Build Fails in My Package. My Package name is UI.

The Composable Architecture version information

1.5.0

Destination operating system

iOS 17

Xcode version information

Version 15.0 (15A240d)

Swift Compiler version information

swift-driver version: 1.87.1 Apple Swift version 5.9 (swiftlang-5.9.0.128.108 clang-1500.0.40.1)
Target: arm64-apple-macosx14.0

[mbrandonw]

Hi @ParkTaeGyu, can you provide a minimal project that demonstrates the problem you are seeing? I don't think this is an issue with the library, and most likely an issue with the project configuration or Xcode previews, and so I am going to convert it to a discussion.