swiftwasm · kateinoigakukun · Aug 18, 2026 · Aug 18, 2026 · Aug 19, 2026 · Aug 19, 2026
diff --git a/.github/actions/install-swift/action.yml b/.github/actions/install-swift/action.yml
@@ -32,6 +32,12 @@ runs:
         zlib1g-dev
         curl
 
+    # Keep the toolchain's `<root>/usr/bin` layout intact. Flattening it into
+    # /usr/local breaks toolchain discovery in the swiftbuild build system,
+    # which derives the toolchain root by stripping `usr/bin` from `swiftc`.
     - name: Install Swift
       shell: bash
-      run: curl -fL ${{ inputs.download-url }} | sudo tar xfz - --strip-components=2 -C /usr/local
+      run: |
+        sudo mkdir -p /opt/swift
+        curl -fL ${{ inputs.download-url }} | sudo tar xfz - --strip-components=1 -C /opt/swift
+        echo "/opt/swift/usr/bin" >> "$GITHUB_PATH"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -14,21 +14,24 @@ jobs:
         entry:
           - os: ubuntu-24.04
             toolchain:
-              download-url: https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a-ubuntu24.04.tar.gz
+              download-url: https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a-ubuntu24.04.tar.gz
             wasi-backend: Node
             target: "wasm32-unknown-wasip1"
+            build-system: swiftbuild
             env: |
               JAVASCRIPTKIT_DISABLE_TRACING_TRAIT=1
           - os: ubuntu-24.04
             toolchain:
               download-url: https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DEVELOPMENT-SNAPSHOT-2026-03-05-a/swift-6.3-DEVELOPMENT-SNAPSHOT-2026-03-05-a-ubuntu24.04.tar.gz
             wasi-backend: Node
             target: "wasm32-unknown-wasip1"
+            build-system: native
           - os: ubuntu-22.04
             toolchain:
-              download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a-ubuntu22.04.tar.gz
+              download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a-ubuntu22.04.tar.gz
             wasi-backend: Node
             target: "wasm32-unknown-wasip1-threads"
+            build-system: swiftbuild
 
     runs-on: ${{ matrix.entry.os }}
     env:
@@ -55,7 +58,7 @@ jobs:
           echo "SWIFT_BIN_PATH=$(dirname $(which swiftc))" >> $GITHUB_ENV
       - run: make bootstrap
       - run: npm run test:runtime
-      - run: make unittest
+      - run: make unittest BUILD_SYSTEM=${{ matrix.entry.build-system }}
         # Skip unit tests with uwasi because its proc_exit throws
         # unhandled promise rejection.
         if: ${{ matrix.entry.wasi-backend != 'MicroWASI' }}
@@ -144,7 +147,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: ./.github/actions/install-swift
         with:
-          download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a-ubuntu22.04.tar.gz
+          download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a-ubuntu22.04.tar.gz
       - run: make bootstrap
       - run: ./Utilities/bridge-js-generate.sh
       - name: Check if BridgeJS generated files are up-to-date
@@ -175,7 +178,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: ./.github/actions/install-swift
         with:
-          download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a-ubuntu22.04.tar.gz
+          download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a-ubuntu22.04.tar.gz
       - uses: swiftwasm/setup-swiftwasm@v2
         id: setup-wasm32-unknown-wasip1
         with: { target: wasm32-unknown-wasip1 }
@@ -198,7 +201,7 @@ jobs:
       - uses: actions/checkout@v7
       - uses: ./.github/actions/install-swift
         with:
-          download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a/swift-DEVELOPMENT-SNAPSHOT-2026-05-27-a-ubuntu22.04.tar.gz
+          download-url: https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2026-08-11-a-ubuntu22.04.tar.gz
       - uses: swiftwasm/setup-swiftwasm@v2
         id: setup-wasm32-unknown-wasip1
         with: { target: wasm32-unknown-wasip1 }

diff --git a/Examples/PlayBridgeJS/Sources/PlayBridgeJS/main.swift b/Examples/PlayBridgeJS/Sources/PlayBridgeJS/main.swift
@@ -70,7 +70,7 @@ import class Foundation.JSONDecoder
             let importTS = ImportTS(progress: .silent, moduleName: moduleName, skeleton: $0)
             return try importTS.finalize()
         }
-        let linker = BridgeJSLink(skeletons: [skeleton], sharedMemory: false)
+        let linker = BridgeJSLink(skeletons: [skeleton])
         let linked = try linker.link()
 
         return PlayBridgeJSOutput(

diff --git a/Makefile b/Makefile
@@ -1,4 +1,5 @@
 SWIFT_SDK_ID ?=
+BUILD_SYSTEM ?= swiftbuild
 ifeq ($(JAVASCRIPTKIT_DISABLE_TRACING_TRAIT),1)
 	TRACING_ARGS :=
 else
@@ -16,7 +17,7 @@ unittest:
 		echo "SWIFT_SDK_ID is not set. Run 'swift sdk list' and pass a matching SDK, e.g. 'make unittest SWIFT_SDK_ID=<id>'."; \
 		exit 2; \
 	}
-	swift package --build-system native --swift-sdk "$(SWIFT_SDK_ID)" \
+	swift package --build-system "$(BUILD_SYSTEM)" --swift-sdk "$(SWIFT_SDK_ID)" \
 	    $(TRACING_ARGS) \
 	    --disable-sandbox \
 	    js test --prelude ./Tests/prelude.mjs -Xnode --expose-gc

diff --git a/Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift b/Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift
@@ -9,7 +9,6 @@ import BridgeJSUtilities
 
 public struct BridgeJSLink {
     var skeletons: [BridgeJSSkeleton] = []
-    let sharedMemory: Bool
     /// Whether to track the lifetime of Swift objects.
     ///
     /// This is useful for debugging memory issues.
@@ -19,11 +18,9 @@ public struct BridgeJSLink {
     private let importedModuleRegistry = ImportedJSModuleRegistry()
 
     public init(
-        skeletons: [BridgeJSSkeleton] = [],
-        sharedMemory: Bool = false
+        skeletons: [BridgeJSSkeleton] = []
     ) {
         self.skeletons = skeletons
-        self.sharedMemory = sharedMemory
     }
 
     /// The identity mode from the config file, resolved from skeletons.
@@ -1173,7 +1170,7 @@ public struct BridgeJSLink {
     }
 
     /// Generates JavaScript output using CodeFragmentPrinter for better maintainability
-    private func generateJavaScript(data: LinkData) throws -> String {
+    private func generateJavaScript(data: LinkData, sharedMemory: Bool) throws -> String {
         let header = """
             // NOTICE: This is auto-generated code by BridgeJS from JavaScriptKit,
             // DO NOT EDIT.
@@ -1346,7 +1343,7 @@ public struct BridgeJSLink {
         return printer.lines.joined(separator: "\n")
     }
 
-    public func link() throws -> (outputJs: String, outputDts: String) {
+    public func link(sharedMemory: Bool = false) throws -> (outputJs: String, outputDts: String) {
         intrinsicRegistry.reset()
         importedModuleRegistry.configure(skeletons: skeletons)
         intrinsicRegistry.classNamespaces = skeletons.reduce(into: [:]) { result, unified in
@@ -1359,7 +1356,7 @@ public struct BridgeJSLink {
         }
         intrinsicRegistry.typeOwnerModules = collectTypeOwnerModules()
         let data = try collectLinkData()
-        let outputJs = try generateJavaScript(data: data)
+        let outputJs = try generateJavaScript(data: data, sharedMemory: sharedMemory)
         let outputDts = generateTypeScript(data: data)
         return (outputJs, outputDts)
     }

diff --git a/Plugins/BridgeJS/Sources/BridgeJSTool/BridgeJSTool.swift b/Plugins/BridgeJS/Sources/BridgeJSTool/BridgeJSTool.swift
@@ -2,7 +2,6 @@
 @preconcurrency import func Foundation.fputs
 @preconcurrency import func Foundation.open
 @preconcurrency import func Foundation.strerror
-@preconcurrency import var Foundation.stderr
 @preconcurrency import var Foundation.errno
 @preconcurrency import var Foundation.O_WRONLY
 @preconcurrency import var Foundation.O_CREAT
@@ -15,6 +14,17 @@
 @preconcurrency import class Foundation.FileManager
 @preconcurrency import class Foundation.JSONDecoder
 @preconcurrency import class Foundation.ProcessInfo
+
+#if canImport(Darwin)
+@preconcurrency import var Darwin.stderr
+#elseif canImport(Glibc)
+@preconcurrency import var Glibc.stderr
+#elseif canImport(Musl)
+@preconcurrency import var Musl.stderr
+#elseif canImport(Android)
+@preconcurrency import var Android.stderr
+#endif
+
 import SwiftParser
 import SwiftSyntax
 

diff --git a/Plugins/BridgeJS/Sources/BridgeJSToolInternal/BridgeJSToolInternal.swift b/Plugins/BridgeJS/Sources/BridgeJSToolInternal/BridgeJSToolInternal.swift
@@ -110,7 +110,7 @@ import ArgumentParser
             let skeletonData = try readData(from: skeletonFile)
             skeletons.append(try JSONDecoder().decode(BridgeJSSkeleton.self, from: skeletonData))
         }
-        let link = BridgeJSLink(skeletons: skeletons, sharedMemory: false)
+        let link = BridgeJSLink(skeletons: skeletons)
         return try link.link()
     }
 

diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/BridgeJSLinkTests.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/BridgeJSLinkTests.swift
@@ -70,7 +70,7 @@ import Testing
         )
         importSwift.addSourceFile(sourceFile, inputFilePath: "\(name).swift")
         let importResult = try importSwift.finalize()
-        var bridgeJSLink = BridgeJSLink(sharedMemory: false)
+        var bridgeJSLink = BridgeJSLink()
         let encoder = JSONEncoder()
         encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
         let unifiedData = try encoder.encode(importResult)
@@ -99,8 +99,7 @@ import Testing
         let bridgeJSLink: BridgeJSLink = BridgeJSLink(
             skeletons: [
                 outputSkeleton
-            ],
-            sharedMemory: false
+            ]
         )
         try snapshot(bridgeJSLink: bridgeJSLink, name: name + ".Global")
     }
@@ -133,8 +132,7 @@ import Testing
             skeletons: [
                 globalSkeleton,
                 privateSkeleton,
-            ],
-            sharedMemory: false
+            ]
         )
         try snapshot(bridgeJSLink: bridgeJSLink, name: "MixedModules")
     }
@@ -151,7 +149,7 @@ import Testing
         )
         importSwift.addSourceFile(sourceFile, inputFilePath: "\(name).swift")
         let importResult = try importSwift.finalize()
-        var bridgeJSLink = BridgeJSLink(sharedMemory: false)
+        var bridgeJSLink = BridgeJSLink()
         let encoder = JSONEncoder()
         encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
         let unifiedData = try encoder.encode(importResult)
@@ -182,7 +180,7 @@ import Testing
         #expect(explicitlyUncachedClass?.identityMode == false)
 
         // Verify generated JS via snapshot
-        let bridgeJSLink = BridgeJSLink(skeletons: [outputSkeleton], sharedMemory: false)
+        let bridgeJSLink = BridgeJSLink(skeletons: [outputSkeleton])
         try snapshot(bridgeJSLink: bridgeJSLink, name: "IdentityModeClass.PerClass")
     }
 
@@ -206,7 +204,7 @@ import Testing
         #expect(explicitlyUncachedClass?.identityMode == false)
 
         // Verify generated JS via snapshot
-        let bridgeJSLink = BridgeJSLink(skeletons: [outputSkeleton], sharedMemory: false)
+        let bridgeJSLink = BridgeJSLink(skeletons: [outputSkeleton])
         try snapshot(bridgeJSLink: bridgeJSLink, name: "IdentityModeClass.ConfigPointer")
     }
 }
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/ImportedJSModuleRegistryTests.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/ImportedJSModuleRegistryTests.swift
@@ -35,7 +35,7 @@ import Testing
     }
 
     private func importLines(_ skeletons: [BridgeJSSkeleton]) throws -> [String] {
-        var link = BridgeJSLink(sharedMemory: false)
+        var link = BridgeJSLink()
         let encoder = JSONEncoder()
         for skeleton in skeletons {
             _ = try link.addSkeletonFile(data: try encoder.encode(skeleton))