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A FlexJS SWC is intended to be an compressed archive of not only pre-compiled ActionScript code and related assets, but also for a collection of JavaScript files that mirror the ActionScript classes in the SWC.  That way, a SWC can be deployed and used in a project without having to also copy around a pile of JS files.

The recommended order of operation steps for creating a SWC is:

1) Cross-compile the AS to JSCreate a Flex Library project

2) (OptionalOptionally) Create a "JS" Flex Library project to produce a "JS" SWC.  A "JS" SWC is needed so that if APIs only available in the JS runtime are available to SWCs that depend on the SWC other SWCs and any runtime-specific code you are creating.

3) Compile the AS into a SWC and use include-files to include the cross-compiled JS output.

When you edit and save changes to AS files in the project, the cross-compiler will generate the JS files and include them in the SWC.  If you have created a "JS" Flex Library project, the compiler will also update the "JS" SWC.

Most, if not all, of the FlexJS framework SWCs use two Flex Library projects to produce a SWC with Flash-specific APIs and another with JS-specific APIs.  The APIs in common are the ones the application developer can use to write code that will work on both runtimesThere doesn't appear to be a way to easily do the three steps from a single Flex Library project in Adobe Flash Builder, so we use two Flex Library projects instead.

The FlexJS framework uses Ant scripts to create the SWCs.   For each SWC, like Core, there should be:

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b) (in frameworks/js/FlexJS/projects/Core) src/main/resources/compile-js-config.xml  - Settings used to cross-compile AS to JS and also to create for the "JS" SWC

c) (in frameworks/projects/Core) src/main/resources/compile-as-config.xml - Settings used to compile the AS to SWF byte code and package include the cross-compiled JS output files into the  from the "JS" SWC.

The Ant script performs the 3 steps of the order of operation, but also copies the JS files to frameworks/js/FlexJS/generated-sources.  When an application is being compiled and JS files are finally need to be linked into the cross-compiled output, the FalconJX compiler looks there before it looks in the SWC for a JS file that matches an AS class.  This allows developers to monkey-patch and quickly try changes to the JS without having to re-build the entire SWC.

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