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This is exactly what Bob and I were discussing this morning.

It's tricky because pub-serve is used both for serving for dartium and for serving for Chrome/FF so people can also iterate there. For the former we want no transformations to be run, for the latter we want all transformations to run. We also want that the entrypoint file that the user loads (index.html) to be the same in both cases.

We can work on making our transformers lazy, but we need from pub a mechanism so we can choose not to run transformers given a particular user agent.

cc @nex3.

Marked this as being blocked by #19169.

ah right. seems Dartium vs non-Dartium is the crucial distinction.

Changed the title to: "polymer: dart2js transformers should not run in "pub serve" with Dartium".

After discussing this more throughout the day. Seems that the best solution we have so far is to have 2 entrypoints for polymer apps when running in pub-serve. Say you have an app with 'web/index.html' as the entrypoint.

What we'll do is the following:

• web/index.html has a small transformer that injects a small .js script tag upfront
• if the script detects that Dart is available, there is nothing else to do, we let the rest of the page load as usual
• otherwise, we use a redirect to change the browser to point at web/index-js.html
• index-js.html is the result of a lazy transformer that does everything we need.

I'm marking now this blocked on issue #18489, since that's how we will be able to implement the lazy transformer. In particular, we need to be able to rewrite smoke's mirror import lazily, and since that modifies code in another package, it would need to be handled as a global transformation. We can possibly also run the observe transformers lazily, so we could avoid all work in Dartium.

Marked this as being blocked by #18489.
Unmarked this as being blocked by #19169.

Marked this as blocking #19174.

Added this to the 1.6 milestone.

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Assigning owner as Priority is High. If this is done in error, please reassign or bump priority down. Thanks!

Set owner to @sigmundch.

Unmarked this as blocking #19174.

This issue has been moved to dart-archive/polymer-dart#400.