From c00089bd5728188ce554303b5b18754467c97c85 Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Fri, 02 Feb 2024 05:19:51 +0000
Subject: [PATCH] chore: add window.addCleanup() for cleaning up handlers

---
 quartz/components/scripts/toc.inline.ts |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/quartz/components/scripts/toc.inline.ts b/quartz/components/scripts/toc.inline.ts
index f3da52c..546859e 100644
--- a/quartz/components/scripts/toc.inline.ts
+++ b/quartz/components/scripts/toc.inline.ts
@@ -16,7 +16,8 @@
 
 function toggleToc(this: HTMLElement) {
   this.classList.toggle("collapsed")
-  const content = this.nextElementSibling as HTMLElement
+  const content = this.nextElementSibling as HTMLElement | undefined
+  if (!content) return
   content.classList.toggle("collapsed")
   content.style.maxHeight = content.style.maxHeight === "0px" ? content.scrollHeight + "px" : "0px"
 }
@@ -25,10 +26,11 @@
   const toc = document.getElementById("toc")
   if (toc) {
     const collapsed = toc.classList.contains("collapsed")
-    const content = toc.nextElementSibling as HTMLElement
+    const content = toc.nextElementSibling as HTMLElement | undefined
+    if (!content) return
     content.style.maxHeight = collapsed ? "0px" : content.scrollHeight + "px"
-    toc.removeEventListener("click", toggleToc)
     toc.addEventListener("click", toggleToc)
+    window.addCleanup(() => toc.removeEventListener("click", toggleToc))
   }
 }
 

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