These classes are largely independent of the Package class.

We were already passing allowTrailingOptions to all ArgParser
call-sites, so this doesn't require any code changes.

Remove unsupported --unsafe-angular2-whitelist parameter.

BUG=
R=jakemac@google.com, vsm@google.com

Review-Url: https://codereview.chromium.org//2939453002 .

Add Travis support.

4 is just a guess here.

This helps ensure that tests behave the same in environments (such as
Travis) where PUB_ENVIRONMENT is already set.

This switches pub's tests over to using the stream matchers built into
test, as well as the test_descriptor, test_process, and
shelf_test_handler packages. It uses async/await rather than
scheduled_test's task queue.

This removes a layer of indirection which should make it much easier to
work on pub's test infrastructure, especially for people unfamiliar with
scheduled_test.

...instead of info.

Allows capturing response information in the case of 5xx errors without
requiring verbose logging

Related to https://github.com/dart-lang/pub-dartlang-dart/issues/94

This reverts commit 830e1481.

This wasn't intended to be committed yet.

Throw real errors and handle them uniformly:

* AssetNotFoundExceptions are passed on
* All other errors are converted to AssetNotFoundExceptions after:
  * Logging the error
  * Creating a new "*.errors" asset which contains the error message
* On the frontend if require js fails to load a module it will request
  the "*.errors" file for the module and log the response.

* remove unused imports

* use SourceFile.fromString, the default constructor is deprecated

BUG=
R=rnystrom@google.com

Review-Url: https://codereview.chromium.org//2899863003 .

BUG=
R=jakemac@google.com

Review-Url: https://codereview.chromium.org//2893483005 .

Closes #1539

On mac `Directory.systemTemp` starts with `/var` which is a symlink to `/private/var`, but the temp dir created by the ScratchSpace has the full resolved path (`/private/var/...`).

* use Result instead of Future for the asset cache
* add tests for requesting invalid files that look like dartdevc files

* Migrated all shared code out of the transformer files, and remove Transform arguments
* Removed transformers, replace with a layer on top of barback
* _buildAsset can synchronously return the map of assets that will be created
* use one scratchSpace for all builds, get shared libs outside of lib working
* make ScratchSpace use the common createFileFromStream method to limit number of open files
* update return type of getBuiltInTransformers back to Iterable<Set<Transformer>>

Also delete temp_environment which snuck back in during a bad merge

Some additional updates based on testing with PPW (now that we have an e2e to play with):

* add sourcemaps to output and update tests
* use strong mode summaries, support filenames with dots, add a fake sourcemap to satisfy package test
* add better error if the module reader fails to find a module for a file
* stop diet parsing, remove --unsafe-force-compile
* add environment constant support to the DartDevcModuleTransformer
* don't output ddc resources in folders with no entrypoints
* don't create sourcemaps in release mode
* update relevant compiler tests to run with dartdevc