webpack.config.js

const webpack = require('webpack');
const path = require('path');

module.exports = {
  entry: './client/index.js',
  output: {
    path: path.resolve(__dirname, 'build'),
    publicPath: '/build/',
    filename: 'bundle.js'
  },
  mode: process.env.NODE_ENV,
  devServer: {
    publicPath: '/build/',
    proxy: {
      context: ['/favorites', '/login', '/assets'],
      target: 'http://localhost:3000'
    }
  },
  module: {
    rules: [
      {
        test: /\.jsx?/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react']
          }
        }
      },
      {
        test: /(css|scss)$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.(png|jpg|gif|woff|woff2|eot|ttf|svg|ico)$/,
        use: [
          {
            // loads files as base64 encoded data url if image file is less than set limit
            loader: 'url-loader',
            options: {
              // if file is greater than the limit (bytes), file-loader is used as fallback
              limit: 8192
            }
          }
        ]
      }
    ]
  }
};