Azure Functions Promise test

function.js

// Version A
module.exports = function(context) {
  var urls = [];
  if (urls.length === 0) {
    context.done();
  }
}

// Version B
module.exports = function(context) {
  var urls = [];
  // Promise.all([]) should resolve immediately with an empty array!
  // https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
  Promise.all(urls).then(() => context.done());
}