sass loader webpack folder and output file

I need to know some basic concepts in the output of the webpack loaders My project has this structure for assets

+resources
    +frontend
         +js
         +sass

and for my output files or the public folder

+public
    +frontend
         +js
         +css

My goal is to obtain the files that are inside the js folder and that are in a build inside the js folder of public and the same with archives SASS, get them from the folder resources / frontend / sass and that is exported in a file public / frontend / css / build.css

Well, with javascript it is working ok, but following some steps I found on the web, I do not see how to determine my starting point for the SASS files and my output file, logically maintaining what is happening now with my JS

The code I paste below corresponds to my file

  

webpack.conf.js

, which at the moment does not throw me any errors after doing webpack --watch

const HtmlWebPackPlugin = require("html-webpack-plugin");


const path = require('path');
const paths = {
    DIST: path.resolve(__dirname, 'public/frontend/js'),
    JS: path.resolve(__dirname, 'resources/assets/frontend/js'),
    CSS: path.resolve(__dirname, 'resources/assets/frontend/css'),
};




// Webpack configuration
 module.exports = {
    mode: "development", // "production" | "development" | "none"
    entry: path.join(paths.JS, 'app.js'), // path donde se ejecuta el inicio de la compilacion, path de entrada
    output: {
                path: paths.DIST,
                filename: 'app.bundle.js'
                },
     module: {
         rules: [
             {
                 test: /\.js$/,
                 use: {
                     loader: 'babel-loader',
                     options: {
                         presets: ['es2015']
                     }
                 }
             },
             { 
                test: /\.scss$/, 
                loader: "style-loader!css-loader!sass-loader",
                exclude: /node_modules/ 
            }
        ]
     }

};