Is your feature request related to a problem? Please describe.
If you try to useapp.less instead ofapp.css, you will getYou may need an appropriate loader to handle this file type. webpack compilation error.

Describe the solution you'd like
We have to provideless loader by default (or by an additional plugin).

Workaround

1. npm i less --save-dev
2. npm i less-loader --save-dev
3. Register the loader in yourwebpack.config:

{test:/\.less$/,use:[{loader:"css-loader",options:{url:false}},less-loader"]},

4. Add theless extention in theresolve section:
   extensions: [".js", ".scss", ".less", ".css"],
5. Add theless extension in thenativescript-dev-webpack/style-hot-loader regex:
   test: /\.(css|scss|less)$/,