brotli-size provides a command-line interface and Node.js API to efficiently determine the Brotli-compressed size of files or strings. It's invaluable for optimizing web assets and reducing transfer overhead. By integrating it into your build process, you can easily track and manage the Brotli compression efficiency of your JavaScript, CSS, and other static assets. This helps ensure optimal loading times and improves your website's performance. The package offers both synchronous and asynchronous methods for size analysis.