This repository contains code illustrating how to use Leaflet with webpack.
To see the code in action, clone or download the repository. Navigate to the directory in your terminal of choice and run npm install.
After npm installs all of the dependencies, type npm run build to bundle all of the assets with webpack.
You can then open dist/index.html in your browser. This should show a basic Leaflet map with a point on the Lincoln Memorial in Washington, D.C. Viewing the page source confirms that all assets are coming from one bundle.js file.
This webpack configuration is as bare-bones as possible to work with Leaflet. If you are going to use it for development, I recommend a basic understanding of webpack.
You will probably want to update the webpack config to include a transpiler, dist folder clean-up, webpack-dev-server, etc.