Hi Piotr, Thank you for this information. Following your reply, I have read Josh Tynjala's papers and, as I understand it, it is possible to use source maps for debugging with FB but it works only with pure as3 source code, not mxml code. Furthermore, the actions are a bit convoluted (you have to load the map from the browser debug tools, go back to the IDE...many extra steps and not very convenient).
It seems that the work Josh has made for tight integration between VSCode and FlexJS is amazing. I will (try to) go that way. VSCode is a good editor, and I don't mind using it for our FlexJS projects (we will keep Eclipse for Java and Coldfusion). Moreover, we are also evaluating ReactJS as a replacement for SWF apps, and use VSCode as an editor. Many thanks again Nicolas Granon
