fix: fix typing discrepency

Author: calebdwilliams

Diff for: src/mutation-observers.ts

@@ -44,7 +44,7 @@ export function observerCallback(mutationList: MutationRecord[]) {
         observer.disconnect();
       }
     });
-  })
+  });
 }
 
 /**

Diff for: src/types.ts

@@ -51,7 +51,7 @@ export interface IElementInternals extends IAom {
     validationMessage?: string,
     anchor?: HTMLElement
   ) => void;
-  shadowRoot: ShadowRoot;
+  shadowRoot: ShadowRoot|null;
   states: CustomStateSet;
   validationMessage: string;
   validity: globalThis.ValidityState;