createServerData$ only being transpiled in .jsx/.tsx files

[thislooksfun]

I don't know whether this is intentional, or even fixable, but if you call createServerData$ outside of a .tsx file, it does not get properly transpiled. I noticed this when I tried to make some helper functions that, since none of them use JSX directly, I put in a .ts file. When looking at the output, however, I noticed that it did not transpire that code correctly. Inside of .tsx files it transpires just fine, as expected, but I would expect that it would work the same in all source files, since they all get lumped into the bundle.

[ryansolid]

Duplicated #408