List all files in a directory in Node.js recursively in a synchronous fashion

walksync.js

// List all files in a directory in Node.js recursively in a synchronous fashion
var walkSync = function(dir, filelist) {
  var fs = fs || require('fs'),
      files = fs.readdirSync(dir);
  filelist = filelist || [];
  files.forEach(function(file) {
    if (fs.statSync(dir + file).isDirectory()) {
      filelist = walkSync(dir + file + '/', filelist);
    }
    else {
      filelist.push(file);
    }
  });
  return filelist;
};

wow.. been receiving notifications for this thing for 9 years!.. it's the most consistent item in my dev career

There are only 3 hard problems in computer science... cache invalidation, naming things, off by one errors, and directory walking,