Error: GET http://localhost:8100/build/css/app.ios.css

Does the “alias” thing that I did is still good?

In webpack.config.js

resolve: {
alias: {
  'ionic': 'ionic-framework',     <----- added to keep import {} 'ionic/ionic'
  'web-animations.min': 'ionic-framework/js/web-animations.min',
},
extensions: ["", ".js", ".ts"]
}