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FlexJS is based on the concept of parallel frameworks. The framework components will have both an AS and JS version, and a next-generation compiler knowns as Falcon will translate MXML and AS to JS and link in JS "classes" instead of AS classes to create the JS output.

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.

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For more details and information see FlexJS FAQ.

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