diff --git a/Plugins/PackageToJS/Templates/runtime.d.ts b/Plugins/PackageToJS/Templates/runtime.d.ts
index 98e1f1cc..9613004c 100644
--- a/Plugins/PackageToJS/Templates/runtime.d.ts
+++ b/Plugins/PackageToJS/Templates/runtime.d.ts
@@ -1,3 +1,6 @@
+type ref = number;
+type pointer = number;
+
 declare class Memory {
     readonly rawMemory: WebAssembly.Memory;
     private readonly heap;
@@ -18,9 +21,6 @@ declare class Memory {
     writeFloat64: (ptr: pointer, value: number) => void;
 }
 
-type ref = number;
-type pointer = number;
-
 /**
  * A thread channel is a set of functions that are used to communicate between
  * the main thread and the worker thread. The main thread and the worker thread
@@ -189,6 +189,7 @@ declare class SwiftRuntime {
     private textEncoder;
     /** The thread ID of the current thread. */
     private tid;
+    UnsafeEventLoopYield: typeof UnsafeEventLoopYield;
     constructor(options?: SwiftRuntimeOptions);
     setInstance(instance: WebAssembly.Instance): void;
     main(): void;
@@ -209,6 +210,8 @@ declare class SwiftRuntime {
     private postMessageToMainThread;
     private postMessageToWorkerThread;
 }
+declare class UnsafeEventLoopYield extends Error {
+}
 
 export { SwiftRuntime };
 export type { SwiftRuntimeOptions, SwiftRuntimeThreadChannel };
diff --git a/Plugins/PackageToJS/Templates/runtime.js b/Plugins/PackageToJS/Templates/runtime.js
index 1e45e9b0..da27a152 100644
--- a/Plugins/PackageToJS/Templates/runtime.js
+++ b/Plugins/PackageToJS/Templates/runtime.js
@@ -312,6 +312,7 @@
             this.version = 708;
             this.textDecoder = new TextDecoder("utf-8");
             this.textEncoder = new TextEncoder(); // Only support utf-8
+            this.UnsafeEventLoopYield = UnsafeEventLoopYield;
             /** @deprecated Use `wasmImports` instead */
             this.importObjects = () => this.wasmImports;
             this._instance = null;
diff --git a/Plugins/PackageToJS/Templates/runtime.mjs b/Plugins/PackageToJS/Templates/runtime.mjs
index ef1f57e7..71f7f9a3 100644
--- a/Plugins/PackageToJS/Templates/runtime.mjs
+++ b/Plugins/PackageToJS/Templates/runtime.mjs
@@ -306,6 +306,7 @@ class SwiftRuntime {
         this.version = 708;
         this.textDecoder = new TextDecoder("utf-8");
         this.textEncoder = new TextEncoder(); // Only support utf-8
+        this.UnsafeEventLoopYield = UnsafeEventLoopYield;
         /** @deprecated Use `wasmImports` instead */
         this.importObjects = () => this.wasmImports;
         this._instance = null;
diff --git a/Runtime/src/index.ts b/Runtime/src/index.ts
index b70bed3a..05c2964f 100644
--- a/Runtime/src/index.ts
+++ b/Runtime/src/index.ts
@@ -38,6 +38,8 @@ export class SwiftRuntime {
     /** The thread ID of the current thread. */
     private tid: number | null;
 
+    UnsafeEventLoopYield = UnsafeEventLoopYield;
+
     constructor(options?: SwiftRuntimeOptions) {
         this._instance = null;
         this._memory = null;
@@ -749,4 +751,4 @@ export class SwiftRuntime {
 /// This error is thrown to unwind the call stack of the Swift program and return the control to
 /// the JavaScript side. Otherwise, the `swift_task_asyncMainDrainQueue` ends up with `abort()`
 /// because the event loop expects `exit()` call before the end of the event loop.
-export class UnsafeEventLoopYield extends Error {}
+class UnsafeEventLoopYield extends Error {}