getCategories.ts

import { getBaseUrl } from '#/lib/getBaseUrl';
import { notFound } from 'next/navigation';
import type { Category } from './category';

// `server-only` guarantees any modules that import code in file
// will never run on the client. Even though this particular api
// doesn't currently use sensitive environment variables, it's
// good practise to add `server-only` preemptively.
import 'server-only';

export async function getCategories({ parent }: { parent?: string } = {}) {
  const res = await fetch(
    `${getBaseUrl()}/api/categories${parent ? `?parent=${parent}` : ''}`,
  );

  if (!res.ok) {
    // Render the closest `error.js` Error Boundary
    throw new Error('Something went wrong!');
  }

  const categories = (await res.json()) as Category[];

  if (categories.length === 0) {
    // Render the closest `not-found.js` Error Boundary
    notFound();
  }

  return categories;
}

export async function getCategory({ slug }: { slug: string }) {
  const res = await fetch(
    `${getBaseUrl()}/api/categories${slug ? `?slug=${slug}` : ''}`,
  );

  if (!res.ok) {
    // Render the closest `error.js` Error Boundary
    throw new Error('Something went wrong!');
  }

  const category = (await res.json()) as Category;

  if (!category) {
    // Render the closest `not-found.js` Error Boundary
    notFound();
  }

  return category;
}