From b6a52505115a1a22ead62ae96c98d8a16b83cedd Mon Sep 17 00:00:00 2001
From: farfromrefuge <martin.guillon@akylas.fr>
Date: Thu, 28 Sep 2023 02:06:36 +0000
Subject: [PATCH] feat: leading support for debounce (#10388)

---
 packages/core/utils/common.ts  | 6 +++++-
 packages/core/utils/index.d.ts | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/core/utils/common.ts b/packages/core/utils/common.ts
index 85c8cf5c8..273f5eb90 100644
--- a/packages/core/utils/common.ts
+++ b/packages/core/utils/common.ts
@@ -173,12 +173,16 @@ export function mainThreadify(func: Function): (...args: any[]) => void {
 	};
 }
 
-export function debounce(fn: any, delay = 300) {
+export function debounce(fn: any, delay = 300, { leading }: { leading?: boolean } = {}) {
 	let timer: NodeJS.Timeout;
 	return (...args: Array<any>) => {
+		if (timer === undefined && leading) {
+			fn.apply(this, args);
+		}
 		clearTimeout(timer);
 		timer = setTimeout(() => {
 			fn.apply(this, args);
+			timer = undefined;
 		}, delay);
 	};
 }
diff --git a/packages/core/utils/index.d.ts b/packages/core/utils/index.d.ts
index 90beec410..38d273302 100644
--- a/packages/core/utils/index.d.ts
+++ b/packages/core/utils/index.d.ts
@@ -45,7 +45,7 @@ export function throttle(fn: any, delay?: number);
  * @param fn Function to debounce
  * @param delay Customize the delay (default is 300ms)
  */
-export function debounce(fn: any, delay?: number);
+export function debounce(fn: any, delay?: number, options?: { leading?: boolean });
 
 /**
  * Releases the reference to the wrapped native object