gated-async/index.js

Wrapper to ensure an async function runs in series when called multiple times

// Generated by LiveScript 1.2.0
(function(){
  var slice$ = [].slice;
  module.exports = function(fn, opts){
    var running, queue;
    opts == null && (opts = {});
    running = false;
    queue = [];
    function out(){
      var args, that, timeout;
      args = slice$.call(arguments);
      if (running) {
        queue.push([run, args]);
      } else {
        run.apply(null, args);
      }
      if ((that = opts.timeout) != null) {
        timeout = setTimeout(dequeue, that);
      }
      function run(){
        var args;
        args = slice$.call(arguments);
        running = true;
        return fn.apply(null, slice$.call(args).concat([dequeue]));
      }
      function dequeue(){
        var that;
        if ((that = timeout) != null) {
          clearTimeout(that);
        }
        if (that = queue.shift()) {
          process.nextTick(function(){
            var f, a;
            f = that[0], a = that[1];
            return f.apply(null, a);
          });
        }
        return running = false;
      }
      return dequeue;
    }
    out.cancel = function(){
      running = false;
      return queue = [];
    };
    return out;
  };
}).call(this);