From 5ccd2129b98e47a04eca38607dcbc7e257ae2b91 Mon Sep 17 00:00:00 2001
From: chenjiahan <chenjiahan@youzan.com>
Date: Fri, 25 Sep 2020 16:07:35 +0800
Subject: [PATCH] chore: remove unused event helper

---
 src/utils/dom/event.ts | 44 ------------------------------------------
 1 file changed, 44 deletions(-)

diff --git a/src/utils/dom/event.ts b/src/utils/dom/event.ts
index 322247318..8f73fac5c 100644
--- a/src/utils/dom/event.ts
+++ b/src/utils/dom/event.ts
@@ -1,47 +1,3 @@
-import { inBrowser } from '..';
-
-// eslint-disable-next-line import/no-mutable-exports
-export let supportsPassive = false;
-
-if (inBrowser) {
-  try {
-    const opts = {};
-    Object.defineProperty(opts, 'passive', {
-      // eslint-disable-next-line getter-return
-      get() {
-        supportsPassive = true;
-      },
-    });
-    window.addEventListener('test-passive', null as any, opts);
-    // eslint-disable-next-line no-empty
-  } catch (e) {}
-}
-
-export function on(
-  target: EventTarget,
-  event: string,
-  handler: EventListenerOrEventListenerObject,
-  passive = false
-) {
-  if (inBrowser) {
-    target.addEventListener(
-      event,
-      handler,
-      supportsPassive ? { capture: false, passive } : false
-    );
-  }
-}
-
-export function off(
-  target: EventTarget,
-  event: string,
-  handler: EventListenerOrEventListenerObject
-) {
-  if (inBrowser) {
-    target.removeEventListener(event, handler);
-  }
-}
-
 export function stopPropagation(event: Event) {
   event.stopPropagation();
 }