nvm ls nvm use 9.4 rm -rf node_modules rm package-lock.json npm uninstall -g ionic npm cache clean --force npm install -g ionic npm install npm install -g cordova

cordova run ios ionic cordova platform remove android ionic cordova platform add android

ionic cordova platform rm android ionic cordova platform add android@6.4.0 ionic cordova build android

ionic cordova platform add ios

ionic cordova run ios

/firebase/ node -v v8.9.3 /9.4 npm -v 5.5.1 /5.6 ionic -v 3.19.0 /3.20 cordova -v 7.1.0 /8.0.0 npm install -g @angular/cli npm install -g cordova ionic npm install angularfire2 firebase promise-polyfill --save

ionic doctor check

ionic info

cli packages: (/Users/developer/.nvm/versions/node/v9.4.0/lib/node_modules)

@ionic/cli-utils  : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : not installed

local packages:

@ionic/app-scripts : 3.1.9
Cordova Platforms  : none
Ionic Framework    : ionic-angular 3.9.2

System:

Android SDK Tools : 26.1.1
ios-deploy        : 1.9.2
Node              : v9.4.0
npm               : 5.6.0
OS                : macOS High Sierra
Xcode             : Xcode 9.3 Build version 9E145

Environment Variables:

ANDROID_HOME : /Users/developer/Library/Android/sdk/

Misc:

backend : pro