swiftwasm · kateinoigakukun · Feb 9, 2026 · Feb 8, 2026
diff --git a/Plugins/BridgeJS/Sources/BridgeJSCore/ImportTS.swift b/Plugins/BridgeJS/Sources/BridgeJSCore/ImportTS.swift
@@ -957,18 +957,8 @@ extension BridgeType {
            return LoweringParameterInfo(loweredParameters: [("funcRef", .i32)])
        case .unsafePointer:
            return LoweringParameterInfo(loweredParameters: [("pointer", .pointer)])
-        case .swiftHeapObject(let className):
-            switch context {
-            case .importTS:
-                throw BridgeJSCoreError(
-                    """
-                    swiftHeapObject '\(className)' is not supported in TypeScript imports.
-                    Swift classes can only be used in @JS protocols where Swift owns the instance.
-                    """
-                )
-            case .exportSwift:
-                return LoweringParameterInfo(loweredParameters: [("pointer", .pointer)])
-            }
+        case .swiftHeapObject:
+            return LoweringParameterInfo(loweredParameters: [("pointer", .pointer)])
        case .swiftProtocol:
            throw BridgeJSCoreError("swiftProtocol is not supported in imported signatures")
        case .caseEnum:
@@ -1038,18 +1028,8 @@ extension BridgeType {
            return LiftingReturnInfo(valueToLift: .i32)
        case .unsafePointer:
            return LiftingReturnInfo(valueToLift: .pointer)
-        case .swiftHeapObject(let className):
-            switch context {
-            case .importTS:
-                throw BridgeJSCoreError(
-                    """
-                    swiftHeapObject '\(className)' cannot be returned from imported TypeScript functions.
-                    JavaScript cannot create Swift heap objects.
-                    """
-                )
-            case .exportSwift:
-                return LiftingReturnInfo(valueToLift: .pointer)
-            }
+        case .swiftHeapObject:
+            return LiftingReturnInfo(valueToLift: .pointer)
        case .swiftProtocol:
            throw BridgeJSCoreError("swiftProtocol is not supported in imported signatures")
        case .caseEnum:

diff --git a/Plugins/BridgeJS/Sources/BridgeJSLink/JSGlueGen.swift b/Plugins/BridgeJS/Sources/BridgeJSLink/JSGlueGen.swift
@@ -581,7 +581,7 @@ struct IntrinsicJSFragment: Sendable {
        return IntrinsicJSFragment(
            parameters: ["pointer"],
            printCode: { arguments, scope, printer, cleanupCode in
-                return ["\(name).__construct(\(arguments[0]))"]
+                return ["_exports['\(name)'].__construct(\(arguments[0]))"]
            }
        )
    }
@@ -1985,14 +1985,7 @@ struct IntrinsicJSFragment: Sendable {
        case .jsValue: return .jsValueLiftParameter
        case .unsafePointer: return .identity
        case .swiftHeapObject(let name):
-            switch context {
-            case .importTS:
-                throw BridgeJSLinkError(
-                    message: "swiftHeapObject '\(name)' can only be used in protocol exports, not in \(context)"
-                )
-            case .exportSwift:
-                return .swiftHeapObjectLiftParameter(name)
-            }
+            return .swiftHeapObjectLiftParameter(name)
        case .swiftProtocol: return .jsObjectLiftParameter
        case .void:
            throw BridgeJSLinkError(
@@ -2074,15 +2067,8 @@ struct IntrinsicJSFragment: Sendable {
        case .jsObject: return .jsObjectLowerReturn
        case .jsValue: return .jsValueLowerReturn(context: context)
        case .unsafePointer: return .identity
-        case .swiftHeapObject(let name):
-            switch context {
-            case .importTS:
-                throw BridgeJSLinkError(
-                    message: "swiftHeapObject '\(name)' can only be used in protocol exports, not in \(context)"
-                )
-            case .exportSwift:
-                return .swiftHeapObjectLowerReturn
-            }
+        case .swiftHeapObject:
+            return .swiftHeapObjectLowerReturn
        case .swiftProtocol: return .jsObjectLowerReturn
        case .void: return .void
        case .nullable(let wrappedType, let kind):

diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/Inputs/MacroSwift/SwiftClass.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/Inputs/MacroSwift/SwiftClass.swift
@@ -18,3 +18,5 @@

 @JS public class PublicGreeter {}
 @JS package class PackageGreeter {}
+
+@JSFunction func jsRoundTripGreeter(greeter: Greeter) throws(JSException) -> Greeter
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/SwiftClass.json b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/SwiftClass.json
@@ -141,5 +141,34 @@

    ]
  },
+  "imported" : {
+    "children" : [
+      {
+        "functions" : [
+          {
+            "name" : "jsRoundTripGreeter",
+            "parameters" : [
+              {
+                "name" : "greeter",
+                "type" : {
+                  "swiftHeapObject" : {
+                    "_0" : "Greeter"
+                  }
+                }
+              }
+            ],
+            "returnType" : {
+              "swiftHeapObject" : {
+                "_0" : "Greeter"
+              }
+            }
+          }
+        ],
+        "types" : [
+
+        ]
+      }
+    ]
+  },
  "moduleName" : "TestModule"
 }
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/SwiftClass.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSCodegenTests/SwiftClass.swift
@@ -134,4 +134,22 @@ fileprivate func _bjs_PackageGreeter_wrap(_ pointer: UnsafeMutableRawPointer) ->
 fileprivate func _bjs_PackageGreeter_wrap(_ pointer: UnsafeMutableRawPointer) -> Int32 {
    fatalError("Only available on WebAssembly")
 }
-#endif
+#endif
+
+#if arch(wasm32)
+@_extern(wasm, module: "TestModule", name: "bjs_jsRoundTripGreeter")
+fileprivate func bjs_jsRoundTripGreeter(_ greeter: UnsafeMutableRawPointer) -> UnsafeMutableRawPointer
+#else
+fileprivate func bjs_jsRoundTripGreeter(_ greeter: UnsafeMutableRawPointer) -> UnsafeMutableRawPointer {
+    fatalError("Only available on WebAssembly")
+}
+#endif
+
+func _$jsRoundTripGreeter(_ greeter: Greeter) throws(JSException) -> Greeter {
+    let greeterPointer = greeter.bridgeJSLowerParameter()
+    let ret = bjs_jsRoundTripGreeter(greeterPointer)
+    if let error = _swift_js_take_exception() {
+        throw error
+    }
+    return Greeter.bridgeJSLiftReturn(ret)
+}
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/Protocol.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/Protocol.js
@@ -513,7 +513,7 @@ export async function createInstantiator(options, swift) {
            }
            TestModule["bjs_MyViewControllerDelegate_onHelperUpdated"] = function bjs_MyViewControllerDelegate_onHelperUpdated(self, helper) {
                try {
-                    swift.memory.getObject(self).onHelperUpdated(Helper.__construct(helper));
+                    swift.memory.getObject(self).onHelperUpdated(_exports['Helper'].__construct(helper));
                } catch (error) {
                    setException(error);
                }

diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.d.ts b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.d.ts
@@ -31,6 +31,7 @@ export type Exports = {
    takeGreeter(greeter: Greeter): void;
 }
 export type Imports = {
+    jsRoundTripGreeter(greeter: Greeter): Greeter;
 }
 export function createInstantiator(options: {
    imports: Imports;

diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.js
@@ -38,6 +38,7 @@ export async function createInstantiator(options, swift) {
        addImports: (importObject, importsContext) => {
            bjs = {};
            importObject["bjs"] = bjs;
+            const imports = options.getImports(importsContext);
            bjs["swift_js_return_string"] = function(ptr, len) {
                const bytes = new Uint8Array(memory.buffer, ptr, len);
                tmpRetString = textDecoder.decode(bytes);
@@ -214,6 +215,16 @@ export async function createInstantiator(options, swift) {
                const obj = PublicGreeter.__construct(pointer);
                return swift.memory.retain(obj);
            };
+            const TestModule = importObject["TestModule"] = importObject["TestModule"] || {};
+            TestModule["bjs_jsRoundTripGreeter"] = function bjs_jsRoundTripGreeter(greeter) {
+                try {
+                    let ret = imports.jsRoundTripGreeter(_exports['Greeter'].__construct(greeter));
+                    return ret.pointer;
+                } catch (error) {
+                    setException(error);
+                    return 0
+                }
+            }
        },
        setInstance: (i) => {
            instance = i;

diff --git a/Tests/BridgeJSRuntimeTests/Generated/BridgeJS.swift b/Tests/BridgeJSRuntimeTests/Generated/BridgeJS.swift
@@ -10666,4 +10666,22 @@ func _$jsRoundTripOptionalStringUndefined(_ name: JSUndefinedOr<String>) throws(
        throw error
    }
    return JSUndefinedOr<String>.bridgeJSLiftReturnFromSideChannel()
+}
+
+#if arch(wasm32)
+@_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_SwiftClassSupportImports_jsRoundTripGreeter_static")
+fileprivate func bjs_SwiftClassSupportImports_jsRoundTripGreeter_static(_ greeter: UnsafeMutableRawPointer) -> UnsafeMutableRawPointer
+#else
+fileprivate func bjs_SwiftClassSupportImports_jsRoundTripGreeter_static(_ greeter: UnsafeMutableRawPointer) -> UnsafeMutableRawPointer {
+    fatalError("Only available on WebAssembly")
+}
+#endif
+
+func _$SwiftClassSupportImports_jsRoundTripGreeter(_ greeter: Greeter) throws(JSException) -> Greeter {
+    let greeterPointer = greeter.bridgeJSLowerParameter()
+    let ret = bjs_SwiftClassSupportImports_jsRoundTripGreeter_static(greeterPointer)
+    if let error = _swift_js_take_exception() {
+        throw error
+    }
+    return Greeter.bridgeJSLiftReturn(ret)
 }
diff --git a/Tests/BridgeJSRuntimeTests/Generated/JavaScript/BridgeJS.json b/Tests/BridgeJSRuntimeTests/Generated/JavaScript/BridgeJS.json
@@ -15310,6 +15310,45 @@
        "types" : [

        ]
+      },
+      {
+        "functions" : [
+
+        ],
+        "types" : [
+          {
+            "getters" : [
+
+            ],
+            "methods" : [
+
+            ],
+            "name" : "SwiftClassSupportImports",
+            "setters" : [
+
+            ],
+            "staticMethods" : [
+              {
+                "name" : "jsRoundTripGreeter",
+                "parameters" : [
+                  {
+                    "name" : "greeter",
+                    "type" : {
+                      "swiftHeapObject" : {
+                        "_0" : "Greeter"
+                      }
+                    }
+                  }
+                ],
+                "returnType" : {
+                  "swiftHeapObject" : {
+                    "_0" : "Greeter"
+                  }
+                }
+              }
+            ]
+          }
+        ]
      }
    ]
  },

diff --git a/Tests/BridgeJSRuntimeTests/JavaScript/SwiftClassSupportTests.mjs b/Tests/BridgeJSRuntimeTests/JavaScript/SwiftClassSupportTests.mjs
@@ -0,0 +1,10 @@
+/**
+ * @returns {import('../../../.build/plugins/PackageToJS/outputs/PackageTests/bridge-js.d.ts').Imports["SwiftClassSupportImports"]}
+ */
+export function getImports(importsContext) {
+    return {
+        jsRoundTripGreeter: (greeter) => {
+            return greeter;
+        },
+    };
+}
diff --git a/Tests/BridgeJSRuntimeTests/SwiftClassSupportTests.swift b/Tests/BridgeJSRuntimeTests/SwiftClassSupportTests.swift
@@ -0,0 +1,13 @@
+import XCTest
+@_spi(Experimental) import JavaScriptKit
+
+@JSClass struct SwiftClassSupportImports {
+    @JSFunction static func jsRoundTripGreeter(_ greeter: Greeter) throws(JSException) -> Greeter
+}
+
+final class SwiftClassSupportTests: XCTestCase {
+    func testRoundTripGreeter() throws {
+        let greeter = try SwiftClassSupportImports.jsRoundTripGreeter(Greeter(name: "Hello"))
+        XCTAssertEqual(greeter.name, "Hello")
+    }
+}
diff --git a/Tests/prelude.mjs b/Tests/prelude.mjs
@@ -6,6 +6,7 @@ import {
 import { ImportedFoo } from './BridgeJSRuntimeTests/JavaScript/Types.mjs';
 import { runJsOptionalSupportTests } from './BridgeJSRuntimeTests/JavaScript/OptionalSupportTests.mjs';
 import { getImports as getClosureSupportImports } from './BridgeJSRuntimeTests/JavaScript/ClosureSupportTests.mjs';
+import { getImports as getSwiftClassSupportImports } from './BridgeJSRuntimeTests/JavaScript/SwiftClassSupportTests.mjs';

 /** @type {import('../.build/plugins/PackageToJS/outputs/PackageTests/test.d.ts').SetupOptionsFn} */
 export async function setupOptions(options, context) {
@@ -213,6 +214,7 @@ export async function setupOptions(options, context) {
                    runJsOptionalSupportTests(exports);
                },
                ClosureSupportImports: getClosureSupportImports(importsContext),
+                SwiftClassSupportImports: getSwiftClassSupportImports(importsContext),
            };
        },
        addToCoreImports(importObject, importsContext) {