update to use new analyzer API

dart-archive / observe

Support for marking objects as observable, and getting notifications when those objects are mutated

https://pub.dartlang.org/packages/observe

BSD 3-Clause "New" or "Revised" License

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Closed danrubel closed 7 years ago

danrubel commented 7 years ago

Update internals to use the new analyzer API. See dart-lang/sdk#29519