polymer: turn on MirrorsUsed for all polymer libs

[jmesserly]

this package could benefit greatly, since it only reflects on things that are Observable

[sethladd]

Removed Priority-Unassigned label.
Added Priority-High label.

[sethladd]

Issue #12730 has been merged into this issue.

[sethladd]

I've attached a very simple app with a single custom element. I don't think I use observing at all. After running pub deploy, the output JS file is 1.8MB.

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Attachment:
deleteme2.zip (817.48 KB)

[larsbak]

Added this to the M7 milestone.

[sethladd]

Issue #12917 has been merged into this issue.

[sigmundch]

Marked this as blocking #12917.

[jmesserly]

so, ideally we'd add a few lines:

// in package:observe
@MirrorsUsed(targets: 'observe.Observable', override: 'observe')

// in package:polymer
@MirrorsUsed(targets: 'polymer.Polymer', override: 'polymer')

// in package:polymer_expressions
@MirrorsUsed(targets: 'observe.Observable', override: 'polymer_expressions')

unfortunately this doesn't work currently because mirrorsused doesn't select subtypes

[jmesserly]

Marked this as being blocked by #13283.

[jmesserly]

edit subject; this is a tracking bug for all Polymer.dart code that uses reflection.

We should be able to compile a Polymer app in dart2js with no hints about mirrors, and code size should be small.

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cc @justinfagnani.
cc @sigmundch.
Removed Library-Observe label.
Changed the title to: "polymer: turn on MirrorsUsed for all polymer libs".

[kasperl]

We're making progress on implementing support for meta targets in MirrorsUsed. Try patching in https://codereview.chromium.org/26007002/ and use something like:

   @­MirrorsUsed(metaTargets: 'Observable')
   import 'dart:mirrors';

[sigmundch]

Removed this from the M7 milestone.
Added this to the M8 milestone.

[sigmundch]

Issue #12917 has been merged into this issue.

[sigmundch]

Unmarked this as blocking #12917.

[sigmundch]

Added Library-PolymerBuild label.

[jmesserly]

https://codereview.chromium.org/26967004/