This issue is for discussion of adding Source Map support to Ender so we can ship map data with the ender.min.js for easier debugging. Since (I believe) source maps can map a single minified file to multiple original source files it might enable some neat debugging foo where the original npm package source files can be referenced so you'd even get line-numbers back to your original source file(s).

Resources:

• Source Map Revision 3 Proposal
• Mozilla Dev Tools Source Map documentation
• Google Closure Inspector Guide (this is a bit out of date, refers to Firebug but I think Chrome Dev Tools have better support for Source Maps now, the important bit is using Closure Compiler's --create_source_map)
• Closure Compiler SourceMap.java
• Mozilla's JavaScript (Node) source-map project - with both SourceMapConsumer and SourceMapGenerator (might be a good way to get started)

Nothing in UglifyJS yet, but perhaps this is something we can encourage for their 2.0 rewrite/rework. Alternatively perhaps we can switch to Closure Compiler if you need an Ender build with Source Map output.