Astro content collections orderBy pseudo code

orderBy.ts

import { z } from "zod";

const schema = z.object({
  date: z.date(),
});

const postCollection = {
  type: "content",
  schema: schema,
  orderBy: [(s: z.infer<typeof schema>) => s.date, "DESC"],
};

const collections = {
  blog: postCollection,
} as const;

const dummyData = [
  {
    date: new Date("2021-01-01"),
  },

  {
    date: new Date("2021-01-03"),
  },

  {
    date: new Date("2021-01-02"),
  },
];

const getCollection = async (key: keyof typeof collections) => {
  const collectionConfig = collections[key];
  const data = dummyData.map((d) => {
    const res = collectionConfig.schema.safeParse(d);
    if (!res.success) throw new Error("Invalid data");
    return res.data;
  });

  const [orderBy, DIR] = (collectionConfig.orderBy ?? []) as [
    Function,
    "ASC" | "DESC",
  ];

  if (!orderBy) return data;

  const sortedData = data.toSorted((a, b) => {
    const aOrderBy = orderBy(a);
    const bOrderBy = orderBy(b);

    switch (DIR) {
      case "ASC":
        return aOrderBy < bOrderBy ? -1 : 1;
      case "DESC":
        return aOrderBy < bOrderBy ? 1 : -1;
      default:
        throw new Error("Invalid direction");
    }
  });

  return sortedData;
};

const data = await getCollection("blog");

console.log(data);