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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 steps for creating a SWC is:

1) Create a Flex Library project

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

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 runtimes.

 

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

a) build.xml - the Ant script (in frameworks/projects/Core, and another one in frameworks/js/FlexJS/projects/Core)

b) (in frameworks/js/FlexJS/projects/Core) src/main/resources/compile-js-config.xml  - Settings used to cross-compile AS to JS 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 include the cross-compiled JS  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.

When compiling in step 1 and 2, the COMPILE::SWF conditional compilation flag is set to false and COMPILE:JS is true.  Only on the last step 3 is COMPILE::SWF set to true and COMPILE::JS set to false.

 

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