rx-winjs/src/webworker.js

Library for composing asynchronous and event-based operations in JavaScript extending the Windows WinJS library

    if (window.Worker) {
        /**
         * Creates a Web Worker with a given URL as a Subject.
         * 
         * @example
         * var worker = Rx.DOM.fromWebWorker('worker.js');
         *
         * @param {String} url The URL of the Web Worker.
         * @returns {Subject} A Subject wrapping the Web Worker.
         */
        Rx.WinJS.fromWebWorker = function (url) {
            var worker = new window.Worker(url);

            var observable = observableCreateWithDisposable(function (obs) {
                worker.onmessage = function (data) {
                    obs.onNext(data);
                };

                worker.onerror = function (err) {
                    obs.onError(err);
                };

                return disposableCreate(function () {
                    worker.close();
                });
            });

            var observer = observerCreate(function (data) {
                worker.postMessage(data);
            });

            return Subject.create(observer, observable);
        };      
    }