add support for global transformers in code_transformers

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="96" height="96"hspace="10"> Issue by sigmundch
Originally opened as dart-lang/sdk#18489

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Implement a generic transformer that:

• can only run in the entrypoint package
• allows specifying modifications to files in any package, but that are only visible to the compilation of a single entrypoint.
• does a functional copy of the import graph, so that all these modifications are supported.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Marked this as blocking dart-archive/polymer-dart#400.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Marked this as blocking dart-archive/polymer-dart#369.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Added this to the 1.6 milestone.
Removed Priority-Unassigned label.
Added Priority-High label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Removed this from the 1.6 milestone.
Added Polymer-P-1 label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Removed Polymer-P-1 label.
Added Polymer-Milestone-Next label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Added PolymerMilestone-Next label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Removed Polymer-Milestone-Next label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2156198?v=3" align="left" width="48" height="48"hspace="10"> Comment by kasperl

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Added this to the 1.6 milestone.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Removed this from the 1.6 milestone.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Marked this as blocking dart-archive/polymer-dart#405.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Marked this as blocking dart-archive/polymer-dart#422.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2156198?v=3" align="left" width="48" height="48"hspace="10"> Comment by kasperl

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Added this to the 1.6 milestone.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Removed this from the 1.6 milestone.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2049220?v=3" align="left" width="48" height="48"hspace="10"> Comment by sigmundch

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Marked this as blocking dart-archive/polymer-dart#432.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/522948?v=3" align="left" width="48" height="48"hspace="10"> Comment by justinfagnani

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+Bob and Natalie

Shouldn't this be a basic feature of pub and barback rather than be built as a separate transformer system on top of it?

I need a global transformer for js-interop, and we already have ones that workaround pub's single-package limitation for Polymer, Angular, and any transformer that uses code_transformers.

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cc @nex3.
cc @munificent.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/522948?v=3" align="left" width="48" height="48"hspace="10"> Comment by justinfagnani

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Siggi just pointed me to the bug on barkback. https://code.google.com/p/dart/issues/detail?id=17306

[DartBot]

<img src="https://avatars.githubusercontent.com/u/2156198?v=3" align="left" width="48" height="48"hspace="10"> Comment by kasperl

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Added Accepted label.

[jakemac53]

Closing as this is not planned afaik