webpack.config.js

const path = require('path');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-react', '@babel/preset-env'],
            },
          },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
      {
        test: /\.(png|jpg|gif|svg)$/,
        use: {
          loader: 'url-loader',
          options: {
            limit: 8192,
            name: 'images/[name].[ext]',
          },
        },
      },
    ],
  },
  plugins: [
  ],
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  devServer: {
    static: {
      directory: path.join('wp-content', 'themes', __dirname, 'dist'),
    },
    compress: true,
    port: 9000,
    hot: true,
  },
};