tree ee324d19438bc95830e6ddb9dc45d5a3de0198bb
parent f03ff4fe8892fe6592446a7c8d8e2f19ac4b137f
author Nate Bosch <nbosch1@gmail.com> 1550860051 -0800
committer GitHub <noreply@github.com> 1550860051 -0800
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Use conditional imports for `dart:isolate` (#21)

This is specified as not existing on the web platforms, although in
practice it can be imported an at least one API works on DDC but not
dart2js. Since this may become more strict, use conditional imports with
an explicitly non-working fallback when `dart:isolate` is not available.

- Make `CurrentIsolateResolver` private and add a top level method
  instead since it is easier to stub.
- Rename `util_stub.dart` to `util_io_sub.dart` to avoid confusion
  against the new `util_isolate_stub.dart`.