fix(watch): check child message data to be an object (#224)

Co-authored-by: Hiroki Osame <hiroki.osame@gmail.com>

src/watch/utils.ts

@@ -35,7 +35,7 @@ export function isDependencyPath(
 ): data is { type: 'dependency'; path: string } {
 	return (
 		data
-		&& 'type' in data
+		&& typeof data === 'object'
 		&& data.type === 'dependency'
 	);
 }