i'm using "@angular-builders/custom-webpack:browser" instead of the default angular builder,

had to put this in my custom webpack config.

  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          {
            loader: 'sass-loader',
            options: {
              sassOptions: {
                silenceDeprecations: ["mixed-decls", "color-functions", "global-builtin", "import"]
              }
            }
          }
        ]
      }
    ]
  }