THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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I will assume you know how to use IntelliJ and focus on the FlexJS configuration only, I will also assume, you installed the FlexJS SDK in a location that I will name <FLEXJS_INSTALL_FOLDER>.
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I will now explain how to configure IntelliJ modules base based on Externs which will allow you to create low level FlexJS components based on AS3 / JavaScript but written in AS3-JS only or simply to create AS3-JS application.