Ionic package IOS Build fails missing 'xcode' npm module on setManualSigning.js

I don't think you have updated ionic/ionic-cli properly.
Try to do a

npm uninstall -g ionic
npm install -g ionic@latest
npm install -g cordova
npm install --save-dev --save-exact @ionic/cli-plugin-cordova@latest

xcode-select --install
npm install -g ios-deploy

Then do an ionic info and post that output