Dark mode detection causes crashes in Safari

[MaxDesiatov]

I currently see this as soon as the page loads:

[Error] Fatal error: Unexpectedly found nil while unwrapping an Optional value: 
file Sources/TokamakDOM/App/ColorSchemeObserver.swift, line 30

Not reproducible in other browsers in my testing

[j-f1]

I haven’t been able to reproduce this on my side but this change should help debug:

diff --git a/Sources/TokamakDOM/App/ColorSchemeObserver.swift b/Sources/TokamakDOM/App/ColorSchemeObserver.swift
index 262acba..2bfebfa 100644
--- a/Sources/TokamakDOM/App/ColorSchemeObserver.swift
+++ b/Sources/TokamakDOM/App/ColorSchemeObserver.swift
@@ -25,7 +25,12 @@ enum ColorSchemeObserver {
 
   static func observe(_ rootElement: JSObjectRef) {
     let closure = JSClosure {
-      publisher.value = .init(matchMediaDarkScheme: $0[0].object!)
+      if let matchMediaDarkScheme = $0[0].object {
+        publisher.value = .init(matchMediaDarkScheme: matchMediaDarkScheme)
+      } else {
+        print($0)
+        _ = JSObjectRef.global.console.object!.log!($0[0])
+      }
       return .undefined
     }
     _ = matchMediaDarkScheme.addEventListener!("change", closure)