Dart transformer unable to access local codegen.dart file for Angular2Dart quickstart

[mvlazar]

Given the following environment:

• windows 10 machine
• dart-sdk-1_20_1

When I try to create the AngularDart quickstart project I get the following error when running pub get:

ERR : Transformer library "package:angular2/transform/codegen.dart" not found.

I am behind a firewall and proxy, but the http_proxy and https_proxy are set and the local pub cache is filled. The root of the error seems to be:

FINE: Wrapped exception: Unable to spawn isolate: Unhandled exception:
| Could not import "package:angular2/transform/codegen.dart" from "file:///C:/Users/localUser/AppData/Local/Temp/pub_edec2900-b22e-11e6-8dab-50465d2e52ac/runInIsolate.dart": Failure getting http://localhost:1182/packages/angular2/transform/codegen.dart:
| 503 Service Unavailable

Is it expected for the transformer to spawn a local process to serve the codegen.dart ? The file is downloaded and placed in the local pub cache.
Attached is the verbose output from the pub command.
output.txt

This issue is similar to #1406 and #1397

[matanlurey]

@mvlazar Is this still occurring for you?

[mvlazar]

Yes, the issue occurred last time I've checked with SDK 1_21_1. Only behind corporate firewall.

[emvev]

I found out this behavior:

when http_proxy and https_proxy is set:

$ pub get
Resolving dependencies...
Got dependencies!
Precompiling dependencies...
Loading source assets...
Loading angular2/transform/codegen and dart_to_js_script_rewriter transformers...
Transformer library "package:angular2/transform/codegen.dart" not found.

after

$ export https_proxy=

The result is the same, but after

$ export http_proxy=
$ pub get
Resolving dependencies...
Got dependencies!
Precompiling dependencies...
Loading source assets...
Loading angular2/transform/codegen and dart_to_js_script_rewriter transformers... (5.4s)
Precompiled angular2, dart_style, dart_to_js_script_rewriter and intl.

[jsarracco]

I was missing 127.0.0.1 localhost from my hosts file after migrating to a new computer. Once I added it to the hosts file it worked!

[matanlurey]

We are no longer supporting transformers or pub serve/build going forward (this tooling has moved elsewhere into the https://github.com/dart-lang/build repository and https://github.com/dart-lang/webdev CLI) so a fix for this is not planned.

We'll be updating the tooling section of the Dart website in the coming weeks with more formal documentation on how to get started.