Run script on files changes using nodemon

I recently was setting up workflow for developing email templates and I need a way to copy files from src directory into dist build folder. It turns out that you can use for this nodemon. Script below is using glob library to watch for all .txt files under source directory and copy them from to build output directory. In addition to that it flattens the path - so if file is under src/plaintext/plaintext.txt the path in output will be dist/plaintext.txt.

import { copyFileSync, existsSync, mkdirSync } from "fs";
import glob from "glob";
import { basename, join } from "path";

const directory = "dist";

if (!existsSync(directory)) {
  mkdirSync(directory);
}

glob("src/**/*.txt", (err, files) => {
  if (err) {
    console.error("Error", err);
  }

  files.forEach((file) => {
    copyFileSync(file, join(directory, basename(file)));
  });
});

How to run this script? I' using nodemon copy-plaintext.mjs --ext txt --watch src command in my package.json. It looks for all files with txt extension under src folder - if they change I'm running copy-plaintext.mjs.