cordova-plugin-firebase: Cannot find module 'xcode' when adding iOS platform

Describe the bug Installation for iOS fails with the following error: “Cannot find module ‘xcode’”

To Reproduce Steps to reproduce the behavior:

1. cordova plugin install cordova-plugin-firebase
2. cordova platform add ios

Expected behavior It should install fine without errors.

Console Logs

Failed to install 'cordova-plugin-firebase': Error: Cannot find module 'xcode'
    at Function.Module._resolveFilename (module.js:476:15)
    at Function.Module._load (module.js:424:25)
    at Module.require (module.js:504:17)
    at require (internal/module.js:20:19)
    at Context.requireCordovaModule (/Users/superapp070318/.nvm/versions/node/v6.13.1/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/Context.js:77:12)
    at Object.removeShellScriptBuildPhase (/Users/superapp070318/Documents/development/kuponki/plugins/cordova-plugin-firebase/scripts/ios/helper.js:88:25)
    at module.exports (/Users/superapp070318/Documents/development/kuponki/plugins/cordova-plugin-firebase/scripts/ios/after_plugin_install.js:8:12)
    at runScriptViaModuleLoader (/Users/superapp070318/.nvm/versions/node/v6.13.1/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:196:18)
    at runScript (/Users/superapp070318/.nvm/versions/node/v6.13.1/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:172:16)
    at /Users/superapp070318/.nvm/versions/node/v6.13.1/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:140:20
Cannot find module 'xcode'

Plugin Version cordova-plugin-firebase 2.0.3 “Google Firebase Plugin”

Desktop (please complete the following information):

• OS: macOS
• cordova 8.1.1