Add a css or less file to the sass task?

Ionic Framework ionic-v3
2

If you don’t get any better answers, you could use webpack, at which point all you have to do is require the css file (or original less) somewhere (I use the file that bootstraps the app). If you have the following stanzas in webpack.config.js, either css or less is automatically handled:

      {
        test: /\.less$/,
        loader: 'style!css!less'
      },
      {
        test: /\.css$/,
        loader: 'style!css'
      },

If you need fonts or other types of resources in addition, you might be interested in this webpack HOWTO. I believe there are comments about how to officially swap browserify for webpack in this starter changes thread.