nuxt-app/app/stores/categories.ts

export const useCategoriesStore = defineStore('categories', () => {
  const tree = ref<any[]>([]);
  const tags = ref<any[]>([]);

  async function fetchCategories() {
    const res = await $fetch<any>('/api/categories');
    if (res.code === 0) tree.value = res.data;
  }

  async function fetchTags() {
    const res = await $fetch<any>('/api/tags');
    if (res.code === 0) tags.value = res.data;
  }

  async function createCategory(data: any) {
    const res = await $fetch<any>('/api/categories', {
      method: 'POST',
      body: data,
    });
    if (res.code === 0) await fetchCategories();
    return res;
  }

  const topTags = computed(() => {
    return tags.value
      .filter((t: any) => t.itemCount > 0)
      .sort((a: any, b: any) => b.itemCount - a.itemCount)
      .slice(0, 10);
  });

  return { tree, tags, fetchCategories, fetchTags, createCategory, topTags };
});