Anders Hejlsberg ecf50e81a7
Properly compute SymbolFlags.Optional for intersected properties (#50958)
* `in` proves property presence only if property can't be undefined

* Accept new baselines

* Add tests

* Accept new baselines

* Properly compute SymbolFlags.Optional for intersected properties

* Accept new baselines

* Check optionality only for property-like declarations

* Add more tests
2022-09-29 15:18:21 -07:00
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