From daa8796554dea41d6fbf81f4eccea58153a4e850 Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Mon, 18 Mar 2024 01:15:42 +0000
Subject: [PATCH] fix: format

---
 quartz/components/scripts/toc.inline.ts |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/quartz/components/scripts/toc.inline.ts b/quartz/components/scripts/toc.inline.ts
index 105889d..546859e 100644
--- a/quartz/components/scripts/toc.inline.ts
+++ b/quartz/components/scripts/toc.inline.ts
@@ -1,5 +1,5 @@
 const bufferPx = 150
-const observer = new IntersectionObserver(entries => {
+const observer = new IntersectionObserver((entries) => {
   for (const entry of entries) {
     const slug = entry.target.id
     const tocEntryElement = document.querySelector(`a[data-for="${slug}"]`)
@@ -16,17 +16,22 @@
 
 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"
 }
 
 function setupToc() {
-  const toc = document.getElementById("toc")!
-  const content = toc.nextElementSibling as HTMLElement
-  content.style.maxHeight = content.scrollHeight + "px"
-  toc.removeEventListener("click", toggleToc)
-  toc.addEventListener("click", toggleToc)
+  const toc = document.getElementById("toc")
+  if (toc) {
+    const collapsed = toc.classList.contains("collapsed")
+    const content = toc.nextElementSibling as HTMLElement | undefined
+    if (!content) return
+    content.style.maxHeight = collapsed ? "0px" : content.scrollHeight + "px"
+    toc.addEventListener("click", toggleToc)
+    window.addCleanup(() => toc.removeEventListener("click", toggleToc))
+  }
 }
 
 window.addEventListener("resize", setupToc)
@@ -36,5 +41,5 @@
   // update toc entry highlighting
   observer.disconnect()
   const headers = document.querySelectorAll("h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]")
-  headers.forEach(header => observer.observe(header))
+  headers.forEach((header) => observer.observe(header))
 })

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