Recursively traverses a directory capturing all of the file paths in that directory and sub-directories yielding each path asynchronously

recursive-file-paths-generator.js

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

/**
 * Generates a set of file paths by recursively traversing the given directory
 * @param {String} dir The directory to traverse
 * @param {Boolean} [join] Truthy to use `path.join` vs the _default_ concatination
 * @yields {String} The next file path in the traversal
 */
async function* files(dir, join) {
  for await (const sdir of await Fs.promises.opendir(dir)) {
    const loc = join ? Path.join(dir, sdir.name) : `${dir}/${sdir.name}`;
    if (sdir.isDirectory()) yield* files(loc);
    else if (sdir.isFile()) yield loc;
  }
}

// example run
const root = '/test';
for await (const path of files(root)) {
  console.log(path);
}