fis `is_head`

src/compiler/compile/render_dom/wrappers/shared/is_head.ts

@@ -1,9 +1,5 @@
-import { Identifier, Node } from 'estree';
+import { Node } from 'estree';
 
-type NarrowNodeType<Y> = Y extends { name: string } ? Y : never;
-
-export function is_head(node: Identifier | Node) {
-	return node && node.type === 'MemberExpression' &&
-		(node.object as NarrowNodeType<Node>).name === '@_document' &&
-		(node.property as NarrowNodeType<Node>).name === 'head';
+export function is_head(node: Node) {
+	return node && node.type === 'MemberExpression' && node.object['name'] === '@_document' && node.property['name'] === 'head';
 }