title: How to setup WebPack dynamic output dir?
body: <p>I have this setup currently. The first three entries (app, blocks, react) compile as expected to the rootDir/prod/[name].min.js - This already works</p>
  <p>I want the 4th entry (which is a dynamic one). I have this directory: rootDir/gutenberg/blocks/[blockNameDir]/frontend.js; I want the frontend.js file for each of the [blockNameDir] directories to be compiled to the same directory as frontend.min.js.</p>
  <p>I figured out how to use the glob for the dynamic entry, but I am stuck at the dynamic output. Thanks in advance.</p>
  <pre><code>const path = require('path');
  var glob = require('glob');
  const outputDir = path.resolve(__dirname, 'prod');
  
  
  module.exports = {
    mode: 'development',
    entry: {
      app: path.resolve(__dirname, './src/js/app.js'),
      blocks: path.resolve(__dirname, './gutenberg/blocks.js'),
      react: path.resolve(__dirname, './src/js/app-react.js'),
  
      frontend: glob.sync(
        path.resolve(__dirname, './gutenberg/blocks/**/frontend.js')
      ),
    },
    devtool: 'inline-source-map',
    output: {
      path: outputDir,
      filename: '[name].min.js',
    },
    devtool: 'source-map',
    module: {
      rules: [
        {
          test: /\.js$/,
          exclude: /node_modules/,
          use: ['babel-loader'],
        },
        {
          test: /\.js$/,
          use: ['source-map-loader'],
          enforce: 'pre',
        },
      ],
    },
  };
  </code></pre>