Feature Request: parallel onMulti about eventemitter2 HOT 5 CLOSED

if (!EventEmitter2) throw 'EventEmitter2 unknown.';

//unordered event chain (emitted once)
EventEmitter2.prototype.oncechain = function() {
    var emitter = this;

    //get arguments array
    var args = Array.prototype.slice.call(arguments);

    //get callback
    var cb = args.pop();

    //keep track of events
    var events = {};

    //checks if we are ready to go
    var checkPending = function() {
        for (var event in events) {
            if (events.hasOwnProperty(event) && events[event].pending) {
                return;
            }
        }

        //all events fired
        var evargs = [];
        for (var event in events) {
            if (events.hasOwnProperty(event)) {
                evargs = evargs.concat(event.args);
            }
        }

        //done
        cb.apply(this, evargs);
    };

    //listen to all events once
    args.forEach(function(event) {
        events[event] = {
            pending: true,
            args: null
        };
        emitter.once(event, function() {
            events[event].pending = false;
            events[event].args = Array.prototype.slice.call(arguments);
            checkPending();
        });
    });

};

function onceChain() {
    var args = [].slice.call(arguments);

    var ee2 = args.unshift();
    var callback = args.pop();

    after.map(args, function (eventName, name, callback) {
        ee2.once(eventName, function (item) {
            callback(null, item);
        });
    }, function (err, data) {
        callback(err, data);
    });
}

onceChain(ee2, 'server.configured', 'socketio.configured', function (err, data) {
    data[0].listen();
});

require('eventemitter2');
require('eventemitter2.flow');