fix: build

src/components/MainComponent.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { useRoute } from '@/router/router';
 import { shallowRef, watch } from 'vue';
-const route = useRoute(() => null);
+const route = useRoute(() => undefined);
 const component = shallowRef(route.mainComponent);
 
 watch(route, (newVal) => {