Hehe, "competition is good for the business"... buts really let's focus on the debugging part here, as VanillaSDK is not yet really a big code base to compile.
> Clever use of comment to Looks like something's missing there? What do you think it would take to introduce source maps to FalconJx? I guess Falcon already keeps the source code file positions (line/column) in the AST nodes, e.g. for error messages? >From my experiment, I have a simple class PositionTrackingWriter<https://github.com/CoreMedia/jangaroo-tools/blob/source-maps/jangaroo/jangaroo-compiler/src/main/java/net/jangaroo/jooc/util/PositionTrackingWriter.java> which extends java.io.Writer and simply counts characters and new lines while outputting them, so always knows the current line / column. Then, the Google source maps API (part of closure.jar) can be used along the lines of import com.google.debugging.sourcemap.SourceMapFormat; import com.google.debugging.sourcemap.SourceMapGenerator; import com.google.debugging.sourcemap.SourceMapGeneratorFactory; SourceMapGenerator sourceMapGenerator = SourceMapGeneratorFactory.getInstance(SourceMapFormat.V3); // for each generated piece of code: sourceMapGenerator.addMapping( sourceFilename, null, sourceFilePosition, outputFileStartPosition, outputFileEndPosition); sourceMapGenerator.appendTo(new FileWriter(outFile.getAbsolutePath() + ".map.json"), outFile.getName()); codeSuffix = "//@ sourceMappingURL=" + outFile.getName() + ".map.json"; Simple enough, isn't it? Greetings -Frank-