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This comment was originally written by @zoechi

As far as I know this can only be set using the transformers section in pubspec.yaml like

transformers:

• $dart2js:
      commandLineOptions: [--enable-enums]

but is this really necessary?
I thought this is only for the analyzer.

It's very much needed. Thanks for the magic code! I'd forgotten about being able to configure dart2js options in pub. Here's what I used:

transformers:

• $dart2js:
      commandLineOptions: [--enable-enum]
• another_transformer

(It's --enable-enum, singular, btw.)

When I don't use the command-line option, I get this error message:

web/main.dart:10:1:
Build completed with 1 errors.Experimental language feature 'enums' is not supported.

[web] GET /main.dart.js => Could not find asset web_async_enum|web/main.dart.js.Use option '--enable-enum' to use enum declarations.

enum Color {
^^^^^^^^^^^^^

This comment was originally written by @zoechi

As far as I know the $dart2js transformer needs to be the last transformer. There should be an open issue to cope with this more gracefully if it is not the case but I couldn't find the issue.

Oh, strange. Thanks for that intel, gzoechi. I originally had it last, but Dart Editor complained until I moved it first. (DE was probably just having a bad moment; it seems to be working now that I move it to last place. I'll follow up with the pub engineers about this.)

It looks like the order doesn't matter any more: https://code.google.com/p/dart/source/detail?r=42072

We expect dart2js to default to enabling enums https://code.google.com/p/dart/issues/detail?id=21885 so perhaps we can close this?

dart2js already accepts enums by default. This can be closed now.

Added AssumedStale label.

Added this to the 1.9 milestone.