• Colloidal@programming.dev
    0·
    8 days ago

    The code is ultimately ran in a JS interpreter. AFAIK TS transpiles into JS, there’s no TS specific interpreter. But such a huge difference is unexpected to me.

    • TCB13@lemmy.worldEnglish
      0·
      7 days ago

      Its really not, have you noticed how an enum is transpiled? you end up with a function… a lot of other things follow the same pattern.

      • FizzyOrange@programming.dev
        0·
        6 days ago

        No they don’t. Enums are actually unique in being the only Typescript feature that requires code gen, and they consider that to have been a mistake.

        In any case that’s not the cause of the difference here.

        • TCB13@lemmy.worldEnglish
          1·
          6 days ago

          This isn’t true, there are other features that “emit code”, that includes: namespaces, decorators and some cases even async / await (when targeting ES5 or ES6).

          • FizzyOrange@programming.dev
            1·
            5 days ago

            Ah yeah I forgot about namespaces. I don’t think they’re a popular feature.

            The other two only generate code for backwards compatibility. When targeting the latest JavaScript versions they don’t generate anything.

            Ok decorators are technically still only a proposal so they’re slightly jumping the gun there, but the point remains.