Matt Bierner a87586c7c3 Add Type Definition Provider API (#19699)
* Add Type Definition Provider API

Adds a new API to support type definition providers and adds an initial type definition provider for TypeScript

* Fix comment

* Addressing comments

* Fixer menu option ordering

* Added simple test
2017-02-02 14:01:23 -08:00
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2017-02-02 17:41:50 +01:00