swiftwasm · kateinoigakukun · Aug 15, 2025
diff --git a/Package.swift b/Package.swift
@@ -4,7 +4,6 @@ import CompilerPluginSupport
 import PackageDescription

 // NOTE: needed for embedded customizations, ideally this will not be necessary at all in the future, or can be replaced with traits
-let shouldBuildForEmbedded = Context.environment["JAVASCRIPTKIT_EXPERIMENTAL_EMBEDDED_WASM"].flatMap(Bool.init) ?? false
 let useLegacyResourceBundling =
    Context.environment["JAVASCRIPTKIT_USE_LEGACY_RESOURCE_BUNDLING"].flatMap(Bool.init) ?? false

@@ -45,18 +44,9 @@ let package = Package(
            dependencies: ["_CJavaScriptKit", "BridgeJSMacros"],
            exclude: useLegacyResourceBundling ? [] : ["Runtime"],
            resources: useLegacyResourceBundling ? [.copy("Runtime")] : [],
-            cSettings: shouldBuildForEmbedded
-                ? [
-                    .unsafeFlags(["-fdeclspec"])
-                ] : nil,
            swiftSettings: [
                .enableExperimentalFeature("Extern")
            ]
-                + (shouldBuildForEmbedded
-                    ? [
-                        .enableExperimentalFeature("Embedded"),
-                        .unsafeFlags(["-Xfrontend", "-emit-empty-object-file"]),
-                    ] : [])
        ),
        .target(name: "_CJavaScriptKit"),
        .macro(
@@ -78,12 +68,7 @@ let package = Package(

        .target(
            name: "JavaScriptBigIntSupport",
-            dependencies: ["_CJavaScriptBigIntSupport", "JavaScriptKit"],
-            swiftSettings: shouldBuildForEmbedded
-                ? [
-                    .enableExperimentalFeature("Embedded"),
-                    .unsafeFlags(["-Xfrontend", "-emit-empty-object-file"]),
-                ] : []
+            dependencies: ["_CJavaScriptBigIntSupport", "JavaScriptKit"]
        ),
        .target(name: "_CJavaScriptBigIntSupport", dependencies: ["_CJavaScriptKit"]),
        .testTarget(
@@ -94,12 +79,7 @@ let package = Package(

        .target(
            name: "JavaScriptEventLoop",
-            dependencies: ["JavaScriptKit", "_CJavaScriptEventLoop"],
-            swiftSettings: shouldBuildForEmbedded
-                ? [
-                    .enableExperimentalFeature("Embedded"),
-                    .unsafeFlags(["-Xfrontend", "-emit-empty-object-file"]),
-                ] : []
+            dependencies: ["JavaScriptKit", "_CJavaScriptEventLoop"]
        ),
        .target(name: "_CJavaScriptEventLoop"),
        .testTarget(

diff --git a/Plugins/PackageToJS/Sources/PackageToJSPlugin.swift b/Plugins/PackageToJS/Sources/PackageToJSPlugin.swift
@@ -374,11 +374,6 @@ struct PackageToJSPlugin: CommandPlugin {

    /// Check if the build is for embedded WebAssembly
    private func isBuildingForEmbedded(selfPackage: Package) -> Bool {
-        if let rawValue = ProcessInfo.processInfo.environment["JAVASCRIPTKIT_EXPERIMENTAL_EMBEDDED_WASM"],
-            let value = Bool(rawValue), value
-        {
-            return true
-        }
        let coreTarget = selfPackage.targets.first { $0.name == "JavaScriptKit" }
        guard let swiftTarget = coreTarget as? SwiftSourceModuleTarget else {
            return false

diff --git a/Plugins/PackageToJS/Tests/ExampleTests.swift b/Plugins/PackageToJS/Tests/ExampleTests.swift
@@ -352,21 +352,16 @@ extension Trait where Self == ConditionTrait {
        }
    }

-    // FIXME: This test fails on the current main snapshot
-    #if !compiler(>=6.3)
    @Test(.requireEmbeddedSwiftInSwiftSDK())
    func embeddedWasmUnknownWasi() throws {
        let swiftSDKID = try #require(Self.getEmbeddedSwiftSDKID())
        try withPackage(at: "Examples/Embedded") { packageDir, _, runSwift in
            try runSwift(
                ["package", "--swift-sdk", swiftSDKID, "js", "-c", "release"],
-                [
-                    "JAVASCRIPTKIT_EXPERIMENTAL_EMBEDDED_WASM": "true"
-                ]
+                [:]
            )
        }
    }
-    #endif  // compiler(>=6.3)

    @Test(.requireSwiftSDK)
    func continuationLeakInTest_XCTest() throws {