Currently, in the presence of source maps, only the original source path (with some exceptions) is matched with the package paths configured in appmap.yml.
This can be too restrictive; if trying to trace third-party code, for example, the user usually doesn't care about the original source directory structure but wants to be able to specify the compiled code path in appmap.yml and have it instrumented (even when there is a problem with handling the sourcemap or the map itself, cf. #181).
My intuition is trying to match BOTH the original and transpiled paths and instrumenting if either does match would be more robust and less surprising.