Synchronous pseudo-promises in MarkLogic

example.sjs

fetch('http://www.marklogic.com')
  .then(console.log);

fetch.sjs

function Request(url, options) {
  this.url = url;
  options = options || {};
  this.method = options.method;
  this.headers = options.headers;
  this.body = options.body;
}
Object.assign(Request.prototype, {});

/**
 *
 * @param {string|Request} request
 * @return Promise
 */
function fetch(request) {
  return new SynchPromise(function(resolve, reject) {
    resolve(fn.head(xdmp.httpGet('http://www.marklogic.com/')));
  });
}

synch-promise.sjs

'use strict'

/**
 * @param {function(resolve, reject)} executor
 */
function SynchPromise(executor) {
  this.executor = executor;
}
Object.assign(SynchPromise.prototype, 
  {
    then(onFulfilled, onRejected) { 
      this.executor(onFulfilled, onRejected);
    },
    catch(callback) { return false; },
  }
);