Use async version of elm compiler to be able to get the error message #20
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I want to be able to display the error message on the screen, for that I need to capture the error message produced during a compilation error, but this is not possible because the sync function from node-elm-compiler returns just a hardcoded string, as you can see here: rtfeldman/node-elm-compiler#110
Since we are already in an async function, we might as well just use await here and get the proper error message