ci: Update CI to compile more targets to wasm.

Author: scottmarchant

.github/workflows/main.yml

@@ -69,7 +69,7 @@ jobs:
     # Workaround https://github.com/nektos/act/issues/1875
     uses: apple/swift-nio/.github/workflows/wasm_swift_sdk.yml@main
     with:
-      additional_command_arguments: "--target NIOCore"
+      additional_command_arguments: "--target _NIOWASIPlatformCompilationChecks"
 
   android-sdk:
     name: Android Swift SDK

.github/workflows/pull_request.yml

@@ -103,7 +103,7 @@ jobs:
     # Workaround https://github.com/nektos/act/issues/1875
     uses: apple/swift-nio/.github/workflows/wasm_swift_sdk.yml@main
     with:
-      additional_command_arguments: "--target NIOCore"
+      additional_command_arguments: "--target _NIOWASIPlatformCompilationChecks"
 
   android-sdk:
     name: Android Swift SDK

Package.swift

@@ -138,6 +138,19 @@ let package = Package(
             ],
             swiftSettings: swiftSettings
         ),
+        // Sole purpose of this target is to check all modules
+        // currently expected to pass compilation for WASI platforms
+        .target(
+            name: "_NIOWASIPlatformCompilationChecks",
+            dependencies: [
+                .target(name: "NIOAsyncRuntime", condition: .when(platforms: [.wasi])),
+                "NIOCore",
+                "NIOEmbedded",  // This should be properly elided in source files for WASI platforms
+                "NIOPosix",  // This should be properly elided in source files for WASI platforms
+                swiftAtomics,
+            ],
+            swiftSettings: swiftSettings
+        ),
         .target(
             name: "NIOFoundationCompat",
             dependencies: [

Sources/_NIOWASIPlatformCompilationChecks/Empty.swift

@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftNIO open source project
+//
+// Copyright (c) 2026 Apple Inc. and the SwiftNIO project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+// NOTE: This file is intentionally empty. The purpose of _NIOWASIPlatformCompilationChecks is
+// to consume all modules expected to pass compilation for WASI platforms.
+//
+// The target is not exposed as a public target in the swift-nio package, and is not
+// intended for public consumption as a dependency.