chore: patch ts def (#439)

Author: zombieJ

src/Dom/shadow.ts

@@ -2,6 +2,6 @@ export function inShadow(ele: Node) {
   return ele?.getRootNode() !== ele?.ownerDocument;
 }
 
-export function getShadowRoot(ele: Node) {
-  return inShadow(ele) ? ele?.getRootNode() : null;
+export function getShadowRoot(ele: Node): ShadowRoot {
+  return inShadow(ele) ? (ele?.getRootNode() as ShadowRoot) : null;
 }