Extending string-based enums

Before string based enums, many would fall back to objects. Using objects also allows extending of types. For example: ```ts const BasicEvents = { Start: "Start", Finish: "Finish" }; const AdvEvents = { ...BasicEvents, Pause: "Pause", Resume: "Resume" }; ``` When switching over to string enums, it"s impossible to achieve this without re-defining the enum. I would be very useful to be able to do something like this: ```ts enum BasicEvents { Start = "Start", Finish = "Finish" }; // extend enum using "extends" keyword enum AdvEvents extends BasicEvents { Pause = "Pause", Resume = "Resume" }; ``` Considering that the produced enums are objects, this won"t be too horrible either: ```ts // extend enum using spread enum AdvEvents { ...BasicEvents, Pause = "Pause", Resume = "Resume" }; ```

Posted by nomaed on Aug 3, 2017, 4:51 PM

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