webpack.config.js

const path = require('path');

module.exports = {
  entry: './frontend/dancey_plus.jsx',
  output: {
    path: path.resolve(__dirname, 'app', 'assets', 'javascripts'),
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        query: {
          presets: ['@babel/env', '@babel/react']
        }
      },
      {
        test: /\.(png|jpe?g|gif)$/i,
        use: [
          {
            loader: 'file-loader',
            options: {
              publicPath: 'assets',
            }
          },
        ],
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.(scss)$/,
        use: [{
          loader: 'style-loader', // inject CSS to page
        }, {
          loader: 'css-loader', // translates CSS into CommonJS modules
        }, {
          loader: 'postcss-loader', // Run post css actions
          options: {
            plugins: function () { // post css plugins, can be exported to postcss.config.js
              return [
                require('precss'),
                require('autoprefixer')
              ];
            }
          }
        }, {
          loader: 'sass-loader' // compiles Sass to CSS
        }]
      },
    ]
  },
  devtool: 'source-map',
  resolve: {
    extensions: ['.js', '.jsx', '*'],
  }
};