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Short term question: Can I safely delete one of the copies of each?

That's a good point. We could remove the *.concat.js versions in release mode.

The main challenge is how. I can imagine 2 options:
  - self-transformers: we could add a transformer to web_components and polymer to respectively remove part of their own code. This might slow down the build of polymer apps enough that we might want to do this differently. In particular, until pub-serve can use some sort of import-hooks, it does a lot of work just to load an extra transfomer.
  - global transformers: we are already planning to move polymer, smoke, and maybe observe to become part of a global-polymer transformer (see issue #9), so it might make sense to put this there too.

As for your question in #­2, yes. You can safely delete the *.concat.js files and the .map files after you build in release mode.

Thanks Siggi!

Removing the *.concat.js files reduced the compiled Observatory size by 0.5MB (or 25%). We were already removing the *.map files.

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Marked this as being blocked by #18489.

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I am going to see how I can clean this up without the global transformer, if nothing else by making the packages that we own perform some cleanup on themselves.

We already do the cleanup ourselves- this bug was opened in the hope that we can stop doing that.

The change I am looking at making would remove the need for you to do any manual cleanup. Specifically I am implementing option #­1 that was discussed earlier (adding a transformer to the web_components package).

Also I am fixing some of the existing cleanup steps that are not functioning properly (for the polymer package)

r39828 submitted, will work on doing the same thing for web_components. I will still leave this issue open though as there is much more we could potentially do given a global transformer.

This issue has been moved to dart-archive/polymer-dart#405.