From 663f3d8c16154d1fae55ce6059e794bad7734597 Mon Sep 17 00:00:00 2001
From: dayongkr <dayong@tossbank.com>
Date: Fri, 24 Oct 2025 11:26:57 +0900
Subject: [PATCH] feat(throttle): preserve this context when called as method

---
 src/function/throttle.spec.ts | 22 ++++++++++++++++++++++
 src/function/throttle.ts      |  4 ++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/function/throttle.spec.ts b/src/function/throttle.spec.ts
index 8808f7f27..d2cfc4817 100644
--- a/src/function/throttle.spec.ts
+++ b/src/function/throttle.spec.ts
@@ -144,4 +144,26 @@ describe('throttle', () => {
 
     expect(callback).toHaveBeenCalledTimes(4);
   });
+
+  it('should preserve this context when called as a method', async () => {
+    const throttleMs = 50;
+    let capturedMsg: string | undefined;
+
+    const obj = {
+      msg: 'hello world',
+      logWithThrottle: throttle(function (this: any) {
+        capturedMsg = this?.msg;
+      }, throttleMs),
+    };
+
+    obj.logWithThrottle();
+    expect(capturedMsg).toBe('hello world');
+
+    capturedMsg = undefined;
+    obj.logWithThrottle();
+    obj.logWithThrottle();
+
+    await delay(throttleMs + 1);
+    expect(capturedMsg).toBe('hello world');
+  });
 });
diff --git a/src/function/throttle.ts b/src/function/throttle.ts
index 9bbae9884..d2a1dc6a5 100644
--- a/src/function/throttle.ts
+++ b/src/function/throttle.ts
@@ -57,7 +57,7 @@ export function throttle<F extends (...args: any[]) => void>(
 
   const debounced = debounce(func, throttleMs, { signal, edges });
 
-  const throttled = function (...args: Parameters<F>) {
+  const throttled = function (this: any, ...args: Parameters<F>) {
     if (pendingAt == null) {
       pendingAt = Date.now();
     } else {
@@ -67,7 +67,7 @@ export function throttle<F extends (...args: any[]) => void>(
       }
     }
 
-    debounced(...args);
+    debounced.apply(this, args);
   };
 
   throttled.cancel = debounced.cancel;