Tiny recursive walkdir (aka readdir) in JavaScript

walkdir.js

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

async function *walkdir(dir) {
  const stack = [dir];
  while (stack.length) {
    const filename = stack.pop();
    const stat = await fs.promises.stat(filename);
    if (stat.isDirectory()) {
      const files = (await fs.promises.readdir(filename))
        .map(ch => path.join(filename, ch));
      stack.push(...files.sort().reverse());
    } else {
      yield filename;
    }
  }
}

(async function(dir) {
  for await (const filename of walkdir(dir)) {
    console.log(filename);
  }
})(process.argv[2]);