Is Skip Compatible with Composable Architecture (TCA) package?

[pitt500]

Steps to reproduce

Hi Everyone,

I wanted to test Skip and see the potential of making apps for iOS and Android with (mostly) Swift and the first impressions are awesome! (Great job! 🎉)

However, I wanted to test if TCA can be used in used to builds and run apps for both platforms.

I added TCA as my dependency:

import PackageDescription

let package = Package(
    name: "project-name",
    defaultLocalization: "en",
    platforms: [.iOS(.v17), .macOS(.v14), .tvOS(.v17), .watchOS(.v10), .macCatalyst(.v17)],
    products: [
        .library(name: "AppName", type: .dynamic, targets: ["AppName"]),
    ],
    dependencies: [
        .package(url: "https://source.skip.tools/skip.git", from: "1.5.18"),
        .package(url: "https://source.skip.tools/skip-fuse-ui.git", "0.0.0"..<"2.0.0"),
        .package(url: "https://github.com/pointfreeco/swift-composable-architecture.git", exact: "1.20.2"),
    ],
    targets: [
        .target(
            name: "AppName",
            dependencies: [
                .product(name: "SkipFuseUI", package: "skip-fuse-ui"),
                .product(name: "ComposableArchitecture", package: "swift-composable-architecture")
            ], plugins: [
                .plugin(name: "skipstone", package: "skip")
            ]
        ),
    ]
)

When I compiled it only for iOS (SKIP_ACTION = none), app compiled without any problems:

However, enabling SKIP_ACTION = launch or SKIP_ACTION = build, swift compiler crashes and an error about "Android buildDebug" is reported (see logs).

After reviewing open issues and FAQs, I couldn't find anything similar to my problem. However, this morning I found this link (https://skip.tools/docs/porting/#porting-swift-packages-to-android) that shares another link containing all tested packages for Skip: https://swift-everywhere.org/

I couldn't see the oficial TCA repo in the list, and based on my results I assume that it's not compatible yet. Could you confirm that?

Also, Is there any workaround or recommendations to add swift packages to my project?
Thank you,
Pedro

Actual results

App using TCA cannot build and launch on Android.

Logs

See more details in this log:

Build AppName App_2025-06-06T08-27-18.txt

Skip Checkup output

skip checkup is all green ✅

[marcprux]

Unfortunately, I don't think TCA is yet compatible with Android — at least, the package doesn't show up as building for Android (or Linux, which is typically a pre-requisite for being about to build for Android): https://swiftpackageindex.com/pointfreeco/swift-composable-architecture

It would be a great addition, though, and I know some of their other packages work on Android. I bet they would appreciate a contribution, or at least an issue report with the error you are encountering.

[pitt500]

@marcprux Thank you for your response. I'll see what I can do 👍🏻

[woodymelling]

TCA has an internal dependency on Combine, which is not available on Android.

Pointfree has been discussing TCA 2.0 recently, and have mentioned that cross platform support is one of the main goals.

[marcprux]

OpenCombine had been a popular replacement for Combine on Linux, so it would probably work for Android as well. They could add a conditional dependency on it like this:

    .target(
      name: "CombineShim",
      dependencies: [.product(
        name: "OpenCombine",
        package: "OpenCombine",
        condition: .when(platforms: [.android, .wasi, .linux])
      )]
    ),

and then in the dependent code they could conditionally import it like:

#if canImport(Combine)
import Combine
#else
import OpenCombine
#endif