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Because ActionScript and JavaScript are based on ECMAScript, most code written in AS translates well to JavaScript. This is because, in most applications, the vast majority of code a Flex customer has written is not actually dependent on Flash. The underlying components like Button and DataGrid probably have dependencies on Flash, but there are equivalents in HTML and other JS frameworks. Thus to the extent a code base consists of assembling a bunch of UI controls into a view and integrating the view with ActionScript to business logic also written in ActionScript, it should be possible to have that code base leverage Flash-dependent controls in a SWF and leverage HTML-dependent controls without Flash in the browser.

Status

FlexJS has some pre-releases, roughy of 'alpha' quality, available here. A simple POC example that allows you to choose a stock and get its price is 0.5.0 was released in November 2015.  It is roughly of beta quality.  The latest release is always available here.  The FlexStore example that was a popular reference example in the Adobe Flex days has been ported to FlexJS.  The SWF version is available here. Right-click and choose View Source to see the MXML and ActionScript used in the example. The MyInitialView.mxml contains the UI and example uses view states, databinding data binding, effects, and custom CSS just like a regular Flex-based Application. Then go here to view the app running in the browser without Flash. It is cross-compiled from the exact same source that created the Flash SWF version. If you right-click on this version, you will see that there is no entry about the Flash Player in the context menu which is proof that it does not use Flash, and you can choose View Source to see the minified JS output from the FlexJS compiler known as FalconFalconJX. Also note that both the SWF and non-SWF versions are much smaller than any version you could create with the current Flex SDK and start up much faster.

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Apache projects, including Apache Flex, are primarily staffed by volunteers working in their spare time. As such, a schedule of milestone dates is not practical. The next major goal is to create an beta-level release, hopefully by the end of 2015, but how soon that happens There is work going on to create Maven artifacts for FlexJS, and bugs are being fixed and more UI components and component sets are under development.  How soon these things happen depends entirely on the number of folks who have time to contribute. There is still a fair amount plenty of work to convert the prototype to beta stagebe done. Anyone with the time and energy is welcome to join in this effort.

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