Conflicts with source assets should have a better error message

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="96" height="96"hspace="10"> Issue by nex3
Originally opened as dart-lang/sdk#14593

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Right now when barback detects a conflict between a generated asset and a source asset, it displays it like so:

    Transforms {Dart2JS on wordherd|web/solver/solver.dart} all emitted asset wordherd|web/solver/solver.dart.js.

This makes it look like a bug, since there's only one transformer there. The error should make it clear that the conflict was with a source asset on the physical filesystem.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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See also issue #17.

[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-lang/pub#704.

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<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Issue dart-lang/pub#783 has been merged into this issue.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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thanks for de-duping!

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<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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FYI - this bug might be also the reason behind issue dart-lang/sdk#15823, I just replied there to clarify. It seems that the process described in issue dart-lang/pub#704 (clicking 'Run As Javascript') is going to trip a lot of people with this error.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/4865287?v=3" align="left" width="48" height="48"hspace="10"> Comment by lrhn

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Removed Area-Library label.
Added Area-Pkg label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Issue #30 has been merged into this issue.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/3276024?v=3" align="left" width="48" height="48"hspace="10"> Comment by anders-sandholm

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Removed Library-Barback label.
Added Pkg-Barback label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Issue dart-lang/pub#861 has been merged into this issue.

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<img src="https://avatars.githubusercontent.com/u/5479?v=3" align="left" width="48" height="48"hspace="10"> Comment by sethladd

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Issue dart-lang/pub#861 has been merged into this issue.

[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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Removed this from the Later milestone.
Added Oldschool-Milestone-Later 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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Removed Oldschool-Milestone-Later label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/7966938?v=3" align="left" width="48" height="48"hspace="10"> Comment by sonoranDesert

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I'm getting an "all emitted asset" error similar to the one described in this ticket when I run the pub build command on my project.

Is there some way I can determine which asset is causing the conflict?

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<img src="https://avatars.githubusercontent.com/u/7966938?v=3" align="left" width="48" height="48"hspace="10"> Comment by sonoranDesert

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Sorry for the emails, but I figured out the issue. If the build artifact already exists then pub build gives you that inscrutable error message, but there is no problem if you clean up beforehand.