Ozair Patel be960fa356 Add related diagnostic to "used before defined" if type is a function that returns a union with undefined (#33171)
* Add "use before defined" diagnostic

* Make "use before defined" diagnostic as related information to TS2454

* Add baseline tests for "use before defined"

* Add test for type alias union with undefined for "use before defined" diagnostic

* Update baselines
2019-11-04 17:53:31 -05:00
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