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/darkmode.inline.ts |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/quartz/components/scripts/darkmode.inline.ts b/quartz/components/scripts/darkmode.inline.ts
index c42a367..4c671aa 100644
--- a/quartz/components/scripts/darkmode.inline.ts
+++ b/quartz/components/scripts/darkmode.inline.ts
@@ -2,21 +2,25 @@
 const currentTheme = localStorage.getItem("theme") ?? userPref
 document.documentElement.setAttribute("saved-theme", currentTheme)
 
+const emitThemeChangeEvent = (theme: "light" | "dark") => {
+  const event: CustomEventMap["themechange"] = new CustomEvent("themechange", {
+    detail: { theme },
+  })
+  document.dispatchEvent(event)
+}
+
 document.addEventListener("nav", () => {
   const switchTheme = (e: any) => {
-    if (e.target.checked) {
-      document.documentElement.setAttribute("saved-theme", "dark")
-      localStorage.setItem("theme", "dark")
-    } else {
-      document.documentElement.setAttribute("saved-theme", "light")
-      localStorage.setItem("theme", "light")
-    }
+    const newTheme = e.target.checked ? "dark" : "light"
+    document.documentElement.setAttribute("saved-theme", newTheme)
+    localStorage.setItem("theme", newTheme)
+    emitThemeChangeEvent(newTheme)
   }
 
   // Darkmode toggle
   const toggleSwitch = document.querySelector("#darkmode-toggle") as HTMLInputElement
-  toggleSwitch.removeEventListener("change", switchTheme)
   toggleSwitch.addEventListener("change", switchTheme)
+  window.addCleanup(() => toggleSwitch.removeEventListener("change", switchTheme))
   if (currentTheme === "dark") {
     toggleSwitch.checked = true
   }
@@ -28,5 +32,6 @@
     document.documentElement.setAttribute("saved-theme", newTheme)
     localStorage.setItem("theme", newTheme)
     toggleSwitch.checked = e.matches
+    emitThemeChangeEvent(newTheme)
   })
 })

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