This library is a naive, incomplete, yet pragmatic implementation of OGC 06-103r4 version 1.2.1. As such, and as it stands now, it is solely intended for conversion between itself and GeoJSON.
elm-package install StoatPower/elm-wkt
npm run test
Read WKT into GeoJson Geometries
import WellKnown exposing (read)
wkt = "GEOMETRYCOLLECTION (POINT (4 6), LINESTRING (4 6, 7 10))"
geometry : Result String Geometry
Write GeoJson Geometries to a WKT String
import WellKnown exposing (write)
geometry : Geometry
[ Point ( 4.0, 6.0, 0.0 )
, LineString [ ( 4.0, 6.0, 0.0 ), ( 7.0, 10.0, 0.0 ) ]
wkt : String