webpack.common.js

const path = require("path");
const CopyPlugin = require('copy-webpack-plugin');

module.exports = {
  entry: "./src/index.js",
  module: {
    rules: [{
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        options: {
          presets: ["@babel/env"]
        }
      },
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"]
      },
      {
        test: /\.(jpg|mp3|wav)$/i,
        loader: "file-loader",
        options: {
          name: "[path][name].[ext]"
        }
      }
    ]
  },
  resolve: {
    extensions: ["*", ".js", ".jsx"]
  },
  output: {
    path: path.resolve(__dirname, "dist/"),
    publicPath: "./",
    filename: "bundle.js"
  },
  plugins: [
    new CopyPlugin([{
      from: 'public'
    }]),
  ]
};