Using webpack-bundle-analyzer in rails

If you are using webpack in Rails via Webpacker, then the webpack configuration is not entirely straigtforward. Below is how I setup Webpack Bundle Analyzer in my projects.

First, install the dependency yarn add -D webpack-bundle-analyzer.

Then add the following to yout webpack developmen configuration: config/webpack/development.js:

const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
environment.plugins.prepend("BundleAnalyzerPlugin", new BundleAnalyzerPlugin());

You will now get a nice visual overview of your bundles when you run ./bin/webpack.