You can definitely get the topojson file using Elm's HTTP library, suppling 
the value decoder 
<> so 
you get back an opaque JSON value, which you can pass out a port (nearly 
certain on that) for the JS topojson decoder to handle, and then pass back 
into the program through another port, also of a JSON value. And then I 
think you might be right -- getting into that is going to be a little 
trickier than in a dynamically typed language. You could try to do ad-hoc 
decoding and get what you need (Debug.crash-ing on cases you don't need to 
handle), or as you suggest, decode according to the spec.

Tell you what: I've got a long plane ride tomorrow so I'll make a library 
to decode GeoJSON into a nice collection of Elm types. You sit tight for a 
few days.

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