Sorting files by their creation date is a common task when working with the file system in Node.js. The fs (File System) module, which is built into Node.js, provides several methods for working with the file system, including the ability to read and sort files by their creation date.

The fs.readdirSync() method reads the files in a specified directory synchronously and returns an array of the files. The fs.statSync() method retrieves the stat of a given file synchronously, which includes information about the file, like the creation time.

Here's an example of how to use the fs.readdirSync() and fs.statSync() methods to sort files by their creation date:

const fs = require('fs');
const path = require('path');

const files = fs.readdirSync("posts");

files.sort((a: string, b: string) => {
  let a_stats = fs.statSync(path.join("posts", a));
  let b_stats = fs.statSync(path.join("posts", b));
  return new Date(b_stats.atime).getTime() - new Date(a_stats.atime).getTime();
});

This code reads all the files in the "posts" directory synchronously, then sorts them based on their access time (atime). The path.join() method joins all given path segments together using the platform-specific separator as a delimiter, then normalizes the resulting path.

It's important to keep in mind that using synchronous methods can cause the program to be blocked until the read operation has completed. If you have a big number of files or your files are big, using the asynchronous version of these methods is a better option.

You can use other methods like fs.readdir() and fs.stat() which are the asynchronous version of these methods, and you can use the fs.stat() method to sort the files by the creation time (ctime) instead of access time (atime).

In conclusion, sorting files by their creation date is a powerful tool when working with the file system in Node.js. The fs module provides several methods for working with the file system, including the ability to read and sort files by their creation date. Remember to choose the right method depending on your use case and the number of files you need to sort.