traverseDir.js

const { promisify } = require('util');
const fs = require('fs');
const path = require('path');

const readDir = promisify(fs.readdir);
const lstat = promisify(fs.lstat);

async function traverseDir(dir, first) {
  // рекурсивный перебор файлов
  const files = await readDir(dir);
  try {
    await Promise.all(
      files.map(file =>
        (async () => {
          try {
            const fullPath = path.join(dir, file);
            const stats = await lstat(fullPath);
            if (stats.isDirectory()) {
              await traverseDir(fullPath);
            } else {
              console.log(fullPath);
              // replace(fullPath);
            }
          } catch (err) {
            return console.log(err);
          }
        })(),
      ),
    );
  } catch (err) {
    return console.log('Unable to scan directory: ' + err);
  }
}

traverseDir(path.join(__dirname, 'app'))
  .then(() => console.log('done'))
  .catch(err => console.trace(err));