Trying build ios ipa from github but unsuccessful

I am trying to build a package from github that can be sideloaded. i am not really familiar with meteor and npm, etc.

i try meteor add-platform ios and then meteor run ios-device but xcode 11.3.1 on macos 10.14.6 gives hundreds of swift errors.

i tried to run meteor update --patch but run into errors with node-sass@3.8.0 which I have not been able to overcome.

what am i doing wrong?