some_function = function(callback) {
  // ...
}
 
allDone = require('all-done')
 
completion_callback = function() {
  // Do something once everything is complete
}
 
callback_maker = allDone(completion_callback)
 
optional_individual_callback = function() {
  // ...
}
 
some_function(callback_maker(optional_individual_callback));

 
allDone = require('all-done')
 
completion_callback = function() {
  console.log("Done")
}
 
callback_maker = allDone(completion_callback)
 
setTimeout(50, callback_maker(function() {console.log("Callback 1")}))
setTimeout(100, function() {
  setTimeout(50, callback_maker(function() {console.log("Callback 2")}))
})