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Follow these instructions to use Flash Builder 4.7 for developing FlexJS applications.  These instructions assume you have installed the Apache FlexJS SDK via one of the methods described in "Getting Started".

Also, starting with Apache FlexJS 0.8.0, you will need to have upgraded Flash Builder to run on Java 7 or 8.  See http://blogs.adobe.com/flashplayer/2016/09/running-adobe-flash-builder-on-mac-with-java-78.html

Install FlexJS SDK as a Flex SDK

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1. Create a new Flex Project from the Flash Builder File menu
   
   
   
   
2. Choose the Apache FlexJS SDK and click Finish or Next to change and default options
   
   
   
   Flash Builder will generate a new project and a new Application MXML file that has errors. Ignore those errors for now.
   
   If you create a Desktop (AIR) project, you will probably get an error in the error log that says: "Error while retrieving predefined variables".  Just ignore that for now.
   
   
3. You can then choose the "Convert New Flex Project to FlexJS Project" script from the list of External Tools in the Run menu.  This will replace files in the new project to look like the Hello World example below.  You can instead choose the "Convert New Flex Project to FlexJS MVC Project" script and it will replace files in the new project to look more like the DataBindingExample below.
   
   Or you can copy the example code below into your Application MXML file or skip to the next section to start with the example project

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To run or debug the JavaScript version, use a browser to open the index.html in the bin/js-debug of the project, or the minified version in the bin/js-release folder.  Each browser has its own JavaScript debugging tools.

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You can

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also create a External tool to open the debug index.html using the settings below (on Mac) 

Adding Support for Opening Declarations

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Please ask questions on the dev@flex.apache.org mailing list. Please start the subject of your email with "[FlexJS (legacy)]". You may file bugs at https://issues.apache.org/jira/browse/FLEX under the component "FlexJS". Remember, Apache projects like Apache Flex is mostly staffed by volunteers so response times may vary and any contributions like patches are welcome.