From f0d2516826292c38e1d6a2ecf29a085a09f2b9ea Mon Sep 17 00:00:00 2001
From: Joe Banks <joe@jb3.dev>
Date: Wed, 11 Sep 2024 17:16:09 +0100
Subject: Type corrections

I have a language server now.
---
 thallium-frontend/src/utils/hooks.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/thallium-frontend/src/utils/hooks.ts b/thallium-frontend/src/utils/hooks.ts
index 9b478f7..997f274 100644
--- a/thallium-frontend/src/utils/hooks.ts
+++ b/thallium-frontend/src/utils/hooks.ts
@@ -1,4 +1,5 @@
-import { useMemo, useState, useEffect } from "react";
+import { useState, useEffect } from "react";
+import { type RefObject } from "react";
 
 export function useVisible(ref: RefObject<HTMLElement>) {
   const [isVisible, setVisible] = useState(false)
@@ -7,7 +8,8 @@ export function useVisible(ref: RefObject<HTMLElement>) {
     const observer = new IntersectionObserver(
         ([entry]) => setVisible(entry.isIntersecting)
     )
-    observer.observe(ref.current)
+    if (ref.current)
+      observer.observe(ref.current)
     return () => observer.disconnect()
   }, [])
 
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