diff --git a/Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift b/Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift
index 0680a3d3..b2bdbe84 100644
--- a/Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift
+++ b/Plugins/BridgeJS/Sources/BridgeJSLink/BridgeJSLink.swift
@@ -134,6 +134,12 @@ struct BridgeJSLink {
                             target.set(tmpRetBytes);
                             tmpRetBytes = undefined;
                         }
+                        bjs["swift_js_retain"] = function(id) {
+                            return swift.memory.retainByRef(id);
+                        }
+                        bjs["swift_js_release"] = function(id) {
+                            swift.memory.release(id);
+                        }
             \(importObjectBuilders.flatMap { $0.importedLines }.map { $0.indent(count: 12) }.joined(separator: "\n"))
                     },
                     setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Sources/BridgeJSTool/ExportSwift.swift b/Plugins/BridgeJS/Sources/BridgeJSTool/ExportSwift.swift
index 2e0180fa..25b1ed01 100644
--- a/Plugins/BridgeJS/Sources/BridgeJSTool/ExportSwift.swift
+++ b/Plugins/BridgeJS/Sources/BridgeJSTool/ExportSwift.swift
@@ -221,11 +221,9 @@ class ExportSwift {
             return nil
         }
         guard let typeDecl = typeDeclResolver.lookupType(for: identifier) else {
-            print("Failed to lookup type \(type.trimmedDescription): not found in typeDeclResolver")
             return nil
         }
         guard typeDecl.is(ClassDeclSyntax.self) || typeDecl.is(ActorDeclSyntax.self) else {
-            print("Failed to lookup type \(type.trimmedDescription): is not a class or actor")
             return nil
         }
         return .swiftHeapObject(typeDecl.name.text)
@@ -237,10 +235,16 @@ class ExportSwift {
         //
         // To update this file, just rebuild your project or run
         // `swift package bridge-js`.
+
+        @_spi(JSObject_id) import JavaScriptKit
+
         @_extern(wasm, module: "bjs", name: "return_string")
         private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
         @_extern(wasm, module: "bjs", name: "init_memory")
         private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
+
+        @_extern(wasm, module: "bjs", name: "swift_js_retain")
+        private func _swift_js_retain(_ ptr: Int32) -> Int32
         """
 
     func renderSwiftGlue() -> String? {
@@ -317,11 +321,19 @@ class ExportSwift {
                 )
                 abiParameterSignatures.append((bytesLabel, .i32))
                 abiParameterSignatures.append((lengthLabel, .i32))
-            case .jsObject:
+            case .jsObject(nil):
                 abiParameterForwardings.append(
                     LabeledExprSyntax(
                         label: param.label,
-                        expression: ExprSyntax("\(raw: param.name)")
+                        expression: ExprSyntax("JSObject(id: UInt32(bitPattern: \(raw: param.name)))")
+                    )
+                )
+                abiParameterSignatures.append((param.name, .i32))
+            case .jsObject(let name):
+                abiParameterForwardings.append(
+                    LabeledExprSyntax(
+                        label: param.label,
+                        expression: ExprSyntax("\(raw: name)(takingThis: UInt32(bitPattern: \(raw: param.name)))")
                     )
                 )
                 abiParameterSignatures.append((param.name, .i32))
@@ -404,10 +416,16 @@ class ExportSwift {
                     }
                     """
                 )
-            case .jsObject:
+            case .jsObject(nil):
+                body.append(
+                    """
+                    return _swift_js_retain(Int32(bitPattern: ret.id))
+                    """
+                )
+            case .jsObject(_?):
                 body.append(
                     """
-                    return ret.id
+                    return _swift_js_retain(Int32(bitPattern: ret.this.id))
                     """
                 )
             case .swiftHeapObject:
@@ -566,6 +584,8 @@ extension BridgeType {
             self = .bool
         case "Void":
             self = .void
+        case "JSObject":
+            self = .jsObject(nil)
         default:
             return nil
         }
diff --git a/Plugins/BridgeJS/Sources/BridgeJSTool/ImportTS.swift b/Plugins/BridgeJS/Sources/BridgeJSTool/ImportTS.swift
index bf269a95..77198dab 100644
--- a/Plugins/BridgeJS/Sources/BridgeJSTool/ImportTS.swift
+++ b/Plugins/BridgeJS/Sources/BridgeJSTool/ImportTS.swift
@@ -333,9 +333,6 @@ struct ImportTS {
 
         @_extern(wasm, module: "bjs", name: "init_memory_with_result")
         private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
-
-        @_extern(wasm, module: "bjs", name: "free_jsobject")
-        private func _free_jsobject(_ ptr: Int32) -> Void
         """
 
     func renderSwiftThunk(
diff --git a/Plugins/BridgeJS/Sources/JavaScript/src/processor.js b/Plugins/BridgeJS/Sources/JavaScript/src/processor.js
index d4c72d28..0f97ea14 100644
--- a/Plugins/BridgeJS/Sources/JavaScript/src/processor.js
+++ b/Plugins/BridgeJS/Sources/JavaScript/src/processor.js
@@ -238,7 +238,8 @@ export class TypeProcessor {
 
         for (const member of node.members) {
             if (ts.isPropertyDeclaration(member)) {
-                // TODO
+                const property = this.visitPropertyDecl(member);
+                if (property) properties.push(property);
             } else if (ts.isMethodDeclaration(member)) {
                 const decl = this.visitFunctionLikeDecl(member);
                 if (decl) methods.push(decl);
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/Inputs/TypeScriptClass.d.ts b/Plugins/BridgeJS/Tests/BridgeJSToolTests/Inputs/TypeScriptClass.d.ts
index d10c0138..074772f2 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/Inputs/TypeScriptClass.d.ts
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/Inputs/TypeScriptClass.d.ts
@@ -1,4 +1,6 @@
 export class Greeter {
+    name: string;
+    readonly age: number;
     constructor(name: string);
     greet(): string;
     changeName(name: string): void;
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/ArrayParameter.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/ArrayParameter.Import.js
index caad458d..73ef604f 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/ArrayParameter.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/ArrayParameter.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_checkArray"] = function bjs_checkArray(a) {
                 options.imports.checkArray(swift.memory.getObject(a));
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/Interface.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/Interface.Import.js
index 4b381185..940c565f 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/Interface.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/Interface.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_returnAnimatable"] = function bjs_returnAnimatable() {
                 let ret = options.imports.returnAnimatable();
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Export.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Export.js
index 2d9ee4b1..a5b206c5 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Export.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Export.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
 
         },
         setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Import.js
index 0d871bbb..7217750a 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveParameters.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_check"] = function bjs_check(a, b) {
                 options.imports.check(a, b);
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Export.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Export.js
index 8a66f041..3480cc97 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Export.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Export.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
 
         },
         setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Import.js
index a638f864..5aba76f1 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/PrimitiveReturn.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_checkNumber"] = function bjs_checkNumber() {
                 let ret = options.imports.checkNumber();
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Export.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Export.js
index c13cd358..c9397bbd 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Export.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Export.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
 
         },
         setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Import.js
index 6e5d4bdc..5b9808f6 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringParameter.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_checkString"] = function bjs_checkString(a) {
                 const aObject = swift.memory.getObject(a);
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Export.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Export.js
index 0208d8ce..caa68521 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Export.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Export.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
 
         },
         setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Import.js
index 26e57959..dfc6f048 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/StringReturn.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_checkString"] = function bjs_checkString() {
                 let ret = options.imports.checkString();
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.Export.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.Export.js
index 971b9d69..6b30cd68 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.Export.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/SwiftClass.Export.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
 
         },
         setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeAlias.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeAlias.Import.js
index e5909f6c..71133762 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeAlias.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeAlias.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_checkSimple"] = function bjs_checkSimple(a) {
                 options.imports.checkSimple(a);
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeScriptClass.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeScriptClass.Import.js
index 2111af96..f86e6054 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeScriptClass.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/TypeScriptClass.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_Greeter_init"] = function bjs_Greeter_init(name) {
                 const nameObject = swift.memory.getObject(name);
@@ -42,6 +48,20 @@ export async function createInstantiator(options, swift) {
                 let ret = new options.imports.Greeter(nameObject);
                 return swift.memory.retain(ret);
             }
+            TestModule["bjs_Greeter_name_get"] = function bjs_Greeter_name_get(self) {
+                let ret = swift.memory.getObject(self).name;
+                tmpRetBytes = textEncoder.encode(ret);
+                return tmpRetBytes.length;
+            }
+            TestModule["bjs_Greeter_name_set"] = function bjs_Greeter_name_set(self, newValue) {
+                const newValueObject = swift.memory.getObject(newValue);
+                swift.memory.release(newValue);
+                swift.memory.getObject(self).name = newValueObject;
+            }
+            TestModule["bjs_Greeter_age_get"] = function bjs_Greeter_age_get(self) {
+                let ret = swift.memory.getObject(self).age;
+                return ret;
+            }
             TestModule["bjs_Greeter_greet"] = function bjs_Greeter_greet(self) {
                 let ret = swift.memory.getObject(self).greet();
                 tmpRetBytes = textEncoder.encode(ret);
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Export.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Export.js
index a3dae190..166eeed0 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Export.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Export.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
 
         },
         setInstance: (i) => {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Import.js b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Import.js
index db9312aa..91b344c3 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Import.js
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/BridgeJSLinkTests/VoidParameterVoidReturn.Import.js
@@ -35,6 +35,12 @@ export async function createInstantiator(options, swift) {
                 target.set(tmpRetBytes);
                 tmpRetBytes = undefined;
             }
+            bjs["swift_js_retain"] = function(id) {
+                return swift.memory.retainByRef(id);
+            }
+            bjs["swift_js_release"] = function(id) {
+                swift.memory.release(id);
+            }
             const TestModule = importObject["TestModule"] = {};
             TestModule["bjs_check"] = function bjs_check() {
                 options.imports.check();
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveParameters.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveParameters.swift
index 6df14156..5181eece 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveParameters.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveParameters.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_check")
 @_cdecl("bjs_check")
 public func _bjs_check(a: Int32, b: Float32, c: Float64, d: Int32) -> Void {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveReturn.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveReturn.swift
index a24b2b31..fb624231 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveReturn.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/PrimitiveReturn.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_checkInt")
 @_cdecl("bjs_checkInt")
 public func _bjs_checkInt() -> Int32 {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringParameter.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringParameter.swift
index 080f028e..d16cd81c 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringParameter.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringParameter.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_checkString")
 @_cdecl("bjs_checkString")
 public func _bjs_checkString(aBytes: Int32, aLen: Int32) -> Void {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringReturn.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringReturn.swift
index bf0be042..4f3a9e89 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringReturn.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/StringReturn.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_checkString")
 @_cdecl("bjs_checkString")
 public func _bjs_checkString() -> Void {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/SwiftClass.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/SwiftClass.swift
index 20fd9c94..fa0190f7 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/SwiftClass.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/SwiftClass.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_takeGreeter")
 @_cdecl("bjs_takeGreeter")
 public func _bjs_takeGreeter(greeter: UnsafeMutableRawPointer) -> Void {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/VoidParameterVoidReturn.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/VoidParameterVoidReturn.swift
index cf4b76fe..a500740c 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/VoidParameterVoidReturn.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ExportSwiftTests/VoidParameterVoidReturn.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_check")
 @_cdecl("bjs_check")
 public func _bjs_check() -> Void {
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/ArrayParameter.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/ArrayParameter.swift
index 1773223b..2d7ad9f2 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/ArrayParameter.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/ArrayParameter.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func checkArray(_ a: JSObject) -> Void {
     @_extern(wasm, module: "Check", name: "bjs_checkArray")
     func bjs_checkArray(_ a: Int32) -> Void
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/Interface.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/Interface.swift
index c565a2f8..85f12665 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/Interface.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/Interface.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func returnAnimatable() -> Animatable {
     @_extern(wasm, module: "Check", name: "bjs_returnAnimatable")
     func bjs_returnAnimatable() -> Int32
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveParameters.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveParameters.swift
index 4ab7f754..401d78b8 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveParameters.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveParameters.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func check(_ a: Double, _ b: Bool) -> Void {
     @_extern(wasm, module: "Check", name: "bjs_check")
     func bjs_check(_ a: Float64, _ b: Int32) -> Void
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveReturn.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveReturn.swift
index a60c9323..da9bfc3b 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveReturn.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/PrimitiveReturn.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func checkNumber() -> Double {
     @_extern(wasm, module: "Check", name: "bjs_checkNumber")
     func bjs_checkNumber() -> Float64
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringParameter.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringParameter.swift
index 491978bc..85852bd2 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringParameter.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringParameter.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func checkString(_ a: String) -> Void {
     @_extern(wasm, module: "Check", name: "bjs_checkString")
     func bjs_checkString(_ a: Int32) -> Void
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringReturn.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringReturn.swift
index ce32a643..4702c5a9 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringReturn.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/StringReturn.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func checkString() -> String {
     @_extern(wasm, module: "Check", name: "bjs_checkString")
     func bjs_checkString() -> Int32
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeAlias.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeAlias.swift
index 79f29c92..2c7a8c7f 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeAlias.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeAlias.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func checkSimple(_ a: Double) -> Void {
     @_extern(wasm, module: "Check", name: "bjs_checkSimple")
     func bjs_checkSimple(_ a: Float64) -> Void
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeScriptClass.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeScriptClass.swift
index 0f1f42d1..3dc779ae 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeScriptClass.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/TypeScriptClass.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 struct Greeter {
     let this: JSObject
 
@@ -37,6 +34,36 @@ struct Greeter {
         self.this = JSObject(id: UInt32(bitPattern: ret))
     }
 
+    var name: String {
+        get {
+            @_extern(wasm, module: "Check", name: "bjs_Greeter_name_get")
+            func bjs_Greeter_name_get(_ self: Int32) -> Int32
+            let ret = bjs_Greeter_name_get(Int32(bitPattern: self.this.id))
+            return String(unsafeUninitializedCapacity: Int(ret)) { b in
+                _init_memory_with_result(b.baseAddress.unsafelyUnwrapped, Int32(ret))
+                return Int(ret)
+            }
+        }
+        nonmutating set {
+            @_extern(wasm, module: "Check", name: "bjs_Greeter_name_set")
+            func bjs_Greeter_name_set(_ self: Int32, _ newValue: Int32) -> Void
+            var newValue = newValue
+            let newValueId = newValue.withUTF8 { b in
+                _make_jsstring(b.baseAddress.unsafelyUnwrapped, Int32(b.count))
+            }
+            bjs_Greeter_name_set(Int32(bitPattern: self.this.id), newValueId)
+        }
+    }
+
+    var age: Double {
+        get {
+            @_extern(wasm, module: "Check", name: "bjs_Greeter_age_get")
+            func bjs_Greeter_age_get(_ self: Int32) -> Float64
+            let ret = bjs_Greeter_age_get(Int32(bitPattern: self.this.id))
+            return Double(ret)
+        }
+    }
+
     func greet() -> String {
         @_extern(wasm, module: "Check", name: "bjs_Greeter_greet")
         func bjs_Greeter_greet(_ self: Int32) -> Int32
diff --git a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/VoidParameterVoidReturn.swift b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/VoidParameterVoidReturn.swift
index 3f2ecc78..71cee5dc 100644
--- a/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/VoidParameterVoidReturn.swift
+++ b/Plugins/BridgeJS/Tests/BridgeJSToolTests/__Snapshots__/ImportTSTests/VoidParameterVoidReturn.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func check() -> Void {
     @_extern(wasm, module: "Check", name: "bjs_check")
     func bjs_check() -> Void
diff --git a/Plugins/PackageToJS/Templates/runtime.d.ts b/Plugins/PackageToJS/Templates/runtime.d.ts
index 9613004c..ed94f7e4 100644
--- a/Plugins/PackageToJS/Templates/runtime.d.ts
+++ b/Plugins/PackageToJS/Templates/runtime.d.ts
@@ -8,6 +8,7 @@ declare class Memory {
     retain: (value: any) => number;
     getObject: (ref: number) => any;
     release: (ref: number) => void;
+    retainByRef: (ref: number) => number;
     bytes: () => Uint8Array<ArrayBuffer>;
     dataView: () => DataView<ArrayBuffer>;
     writeBytes: (ptr: pointer, bytes: Uint8Array) => void;
diff --git a/Plugins/PackageToJS/Templates/runtime.mjs b/Plugins/PackageToJS/Templates/runtime.mjs
index 71f7f9a3..e3673835 100644
--- a/Plugins/PackageToJS/Templates/runtime.mjs
+++ b/Plugins/PackageToJS/Templates/runtime.mjs
@@ -158,6 +158,9 @@ class SwiftRuntimeHeap {
         this._heapEntryByValue.set(value, { id: id, rc: 1 });
         return id;
     }
+    retainByRef(ref) {
+        return this.retain(this.referenceHeap(ref));
+    }
     release(ref) {
         const value = this._heapValueById.get(ref);
         const entry = this._heapEntryByValue.get(value);
@@ -182,6 +185,7 @@ class Memory {
         this.retain = (value) => this.heap.retain(value);
         this.getObject = (ref) => this.heap.referenceHeap(ref);
         this.release = (ref) => this.heap.release(ref);
+        this.retainByRef = (ref) => this.heap.retainByRef(ref);
         this.bytes = () => new Uint8Array(this.rawMemory.buffer);
         this.dataView = () => new DataView(this.rawMemory.buffer);
         this.writeBytes = (ptr, bytes) => this.bytes().set(bytes, ptr);
diff --git a/Runtime/src/memory.ts b/Runtime/src/memory.ts
index d8334516..5ba00c82 100644
--- a/Runtime/src/memory.ts
+++ b/Runtime/src/memory.ts
@@ -13,6 +13,7 @@ export class Memory {
     retain = (value: any) => this.heap.retain(value);
     getObject = (ref: number) => this.heap.referenceHeap(ref);
     release = (ref: number) => this.heap.release(ref);
+    retainByRef = (ref: number) => this.heap.retainByRef(ref);
 
     bytes = () => new Uint8Array(this.rawMemory.buffer);
     dataView = () => new DataView(this.rawMemory.buffer);
diff --git a/Runtime/src/object-heap.ts b/Runtime/src/object-heap.ts
index d59f5101..a239cf2b 100644
--- a/Runtime/src/object-heap.ts
+++ b/Runtime/src/object-heap.ts
@@ -33,6 +33,10 @@ export class SwiftRuntimeHeap {
         return id;
     }
 
+    retainByRef(ref: ref) {
+        return this.retain(this.referenceHeap(ref));
+    }
+
     release(ref: ref) {
         const value = this._heapValueById.get(ref);
         const entry = this._heapEntryByValue.get(value)!;
diff --git a/Tests/BridgeJSRuntimeTests/ExportAPITests.swift b/Tests/BridgeJSRuntimeTests/ExportAPITests.swift
index 8449b06d..e113a514 100644
--- a/Tests/BridgeJSRuntimeTests/ExportAPITests.swift
+++ b/Tests/BridgeJSRuntimeTests/ExportAPITests.swift
@@ -28,6 +28,10 @@ func runJsWorks() -> Void
     return v
 }
 
+@JS func roundTripJSObject(v: JSObject) -> JSObject {
+    return v
+}
+
 @JS class Greeter {
     var name: String
 
diff --git a/Tests/BridgeJSRuntimeTests/Generated/ExportSwift.swift b/Tests/BridgeJSRuntimeTests/Generated/ExportSwift.swift
index 4a7c262c..28514c8e 100644
--- a/Tests/BridgeJSRuntimeTests/Generated/ExportSwift.swift
+++ b/Tests/BridgeJSRuntimeTests/Generated/ExportSwift.swift
@@ -3,11 +3,17 @@
 //
 // To update this file, just rebuild your project or run
 // `swift package bridge-js`.
+
+@_spi(JSObject_id) import JavaScriptKit
+
 @_extern(wasm, module: "bjs", name: "return_string")
 private func _return_string(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 @_extern(wasm, module: "bjs", name: "init_memory")
 private func _init_memory(_ sourceId: Int32, _ ptr: UnsafeMutablePointer<UInt8>?)
 
+@_extern(wasm, module: "bjs", name: "swift_js_retain")
+private func _swift_js_retain(_ ptr: Int32) -> Int32
+
 @_expose(wasm, "bjs_roundTripVoid")
 @_cdecl("bjs_roundTripVoid")
 public func _bjs_roundTripVoid() -> Void {
@@ -62,6 +68,13 @@ public func _bjs_roundTripSwiftHeapObject(v: UnsafeMutableRawPointer) -> UnsafeM
     return Unmanaged.passRetained(ret).toOpaque()
 }
 
+@_expose(wasm, "bjs_roundTripJSObject")
+@_cdecl("bjs_roundTripJSObject")
+public func _bjs_roundTripJSObject(v: Int32) -> Int32 {
+    let ret = roundTripJSObject(v: JSObject(id: UInt32(bitPattern: v)))
+    return _swift_js_retain(Int32(bitPattern: ret.id))
+}
+
 @_expose(wasm, "bjs_takeGreeter")
 @_cdecl("bjs_takeGreeter")
 public func _bjs_takeGreeter(g: UnsafeMutableRawPointer, nameBytes: Int32, nameLen: Int32) -> Void {
diff --git a/Tests/BridgeJSRuntimeTests/Generated/ImportTS.swift b/Tests/BridgeJSRuntimeTests/Generated/ImportTS.swift
index f479a071..c01a0fce 100644
--- a/Tests/BridgeJSRuntimeTests/Generated/ImportTS.swift
+++ b/Tests/BridgeJSRuntimeTests/Generated/ImportTS.swift
@@ -12,9 +12,6 @@ private func _make_jsstring(_ ptr: UnsafePointer<UInt8>?, _ len: Int32) -> Int32
 @_extern(wasm, module: "bjs", name: "init_memory_with_result")
 private func _init_memory_with_result(_ ptr: UnsafePointer<UInt8>?, _ len: Int32)
 
-@_extern(wasm, module: "bjs", name: "free_jsobject")
-private func _free_jsobject(_ ptr: Int32) -> Void
-
 func jsRoundTripVoid() -> Void {
     @_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_jsRoundTripVoid")
     func bjs_jsRoundTripVoid() -> Void
@@ -60,17 +57,54 @@ struct JsGreeter {
         self.this = JSObject(id: UInt32(bitPattern: this))
     }
 
-    init(_ name: String) {
+    init(_ name: String, _ prefix: String) {
         @_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_JsGreeter_init")
-        func bjs_JsGreeter_init(_ name: Int32) -> Int32
+        func bjs_JsGreeter_init(_ name: Int32, _ prefix: Int32) -> Int32
         var name = name
         let nameId = name.withUTF8 { b in
             _make_jsstring(b.baseAddress.unsafelyUnwrapped, Int32(b.count))
         }
-        let ret = bjs_JsGreeter_init(nameId)
+        var prefix = prefix
+        let prefixId = prefix.withUTF8 { b in
+            _make_jsstring(b.baseAddress.unsafelyUnwrapped, Int32(b.count))
+        }
+        let ret = bjs_JsGreeter_init(nameId, prefixId)
         self.this = JSObject(id: UInt32(bitPattern: ret))
     }
 
+    var name: String {
+        get {
+            @_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_JsGreeter_name_get")
+            func bjs_JsGreeter_name_get(_ self: Int32) -> Int32
+            let ret = bjs_JsGreeter_name_get(Int32(bitPattern: self.this.id))
+            return String(unsafeUninitializedCapacity: Int(ret)) { b in
+                _init_memory_with_result(b.baseAddress.unsafelyUnwrapped, Int32(ret))
+                return Int(ret)
+            }
+        }
+        nonmutating set {
+            @_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_JsGreeter_name_set")
+            func bjs_JsGreeter_name_set(_ self: Int32, _ newValue: Int32) -> Void
+            var newValue = newValue
+            let newValueId = newValue.withUTF8 { b in
+                _make_jsstring(b.baseAddress.unsafelyUnwrapped, Int32(b.count))
+            }
+            bjs_JsGreeter_name_set(Int32(bitPattern: self.this.id), newValueId)
+        }
+    }
+
+    var prefix: String {
+        get {
+            @_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_JsGreeter_prefix_get")
+            func bjs_JsGreeter_prefix_get(_ self: Int32) -> Int32
+            let ret = bjs_JsGreeter_prefix_get(Int32(bitPattern: self.this.id))
+            return String(unsafeUninitializedCapacity: Int(ret)) { b in
+                _init_memory_with_result(b.baseAddress.unsafelyUnwrapped, Int32(ret))
+                return Int(ret)
+            }
+        }
+    }
+
     func greet() -> String {
         @_extern(wasm, module: "BridgeJSRuntimeTests", name: "bjs_JsGreeter_greet")
         func bjs_JsGreeter_greet(_ self: Int32) -> Int32
diff --git a/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ExportSwift.json b/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ExportSwift.json
index b4ab9701..d72c17b9 100644
--- a/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ExportSwift.json
+++ b/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ExportSwift.json
@@ -185,6 +185,26 @@
         }
       }
     },
+    {
+      "abiName" : "bjs_roundTripJSObject",
+      "name" : "roundTripJSObject",
+      "parameters" : [
+        {
+          "label" : "v",
+          "name" : "v",
+          "type" : {
+            "jsObject" : {
+
+            }
+          }
+        }
+      ],
+      "returnType" : {
+        "jsObject" : {
+
+        }
+      }
+    },
     {
       "abiName" : "bjs_takeGreeter",
       "name" : "takeGreeter",
diff --git a/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ImportTS.json b/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ImportTS.json
index 867957d9..ad8fcd87 100644
--- a/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ImportTS.json
+++ b/Tests/BridgeJSRuntimeTests/Generated/JavaScript/ImportTS.json
@@ -77,6 +77,14 @@
                 "type" : {
                   "string" : {
 
+                  }
+                }
+              },
+              {
+                "name" : "prefix",
+                "type" : {
+                  "string" : {
+
                   }
                 }
               }
@@ -115,7 +123,24 @@
           ],
           "name" : "JsGreeter",
           "properties" : [
+            {
+              "isReadonly" : false,
+              "name" : "name",
+              "type" : {
+                "string" : {
 
+                }
+              }
+            },
+            {
+              "isReadonly" : true,
+              "name" : "prefix",
+              "type" : {
+                "string" : {
+
+                }
+              }
+            }
           ]
         }
       ]
diff --git a/Tests/BridgeJSRuntimeTests/ImportAPITests.swift b/Tests/BridgeJSRuntimeTests/ImportAPITests.swift
index bc50f9f1..a8d586bf 100644
--- a/Tests/BridgeJSRuntimeTests/ImportAPITests.swift
+++ b/Tests/BridgeJSRuntimeTests/ImportAPITests.swift
@@ -36,9 +36,15 @@ class ImportAPITests: XCTestCase {
     }
 
     func testClass() {
-        let greeter = JsGreeter("Alice")
+        let greeter = JsGreeter("Alice", "Hello")
         XCTAssertEqual(greeter.greet(), "Hello, Alice!")
         greeter.changeName("Bob")
         XCTAssertEqual(greeter.greet(), "Hello, Bob!")
+
+        greeter.name = "Charlie"
+        XCTAssertEqual(greeter.greet(), "Hello, Charlie!")
+        XCTAssertEqual(greeter.name, "Charlie")
+
+        XCTAssertEqual(greeter.prefix, "Hello")
     }
 }
diff --git a/Tests/BridgeJSRuntimeTests/bridge-js.d.ts b/Tests/BridgeJSRuntimeTests/bridge-js.d.ts
index d2a54f05..664dd447 100644
--- a/Tests/BridgeJSRuntimeTests/bridge-js.d.ts
+++ b/Tests/BridgeJSRuntimeTests/bridge-js.d.ts
@@ -4,7 +4,9 @@ export function jsRoundTripBool(v: boolean): boolean
 export function jsRoundTripString(v: string): string
 
 export class JsGreeter {
-    constructor(name: string);
+    name: string;
+    readonly prefix: string;
+    constructor(name: string, prefix: string);
     greet(): string;
     changeName(name: string): void;
 }
\ No newline at end of file
diff --git a/Tests/prelude.mjs b/Tests/prelude.mjs
index 24a194f9..c79feb2a 100644
--- a/Tests/prelude.mjs
+++ b/Tests/prelude.mjs
@@ -20,12 +20,16 @@ export async function setupOptions(options, context) {
                 return v;
             },
             JsGreeter: class {
-                /** @param {string} name */
-                constructor(name) {
+                /**
+                 * @param {string} name
+                 * @param {string} prefix
+                 */
+                constructor(name, prefix) {
                     this.name = name;
+                    this.prefix = prefix;
                 }
                 greet() {
-                    return `Hello, ${this.name}!`;
+                    return `${this.prefix}, ${this.name}!`;
                 }
                 /** @param {string} name */
                 changeName(name) {
@@ -98,6 +102,9 @@ function BridgeJSRuntimeTests_runJsWorks(instance, exports) {
     exports.takeGreeter(g, "Jay");
     assert.equal(g.greet(), "Hello, Jay!");
     g.release();
+
+    const anyObject = {};
+    assert.equal(exports.roundTripJSObject(anyObject), anyObject);
 }
 
 function setupTestGlobals(global) {