Bundlewatch is a CLI tool and GitHub App that helps prevent unexpected bloat in your JavaScript bundles. It compares the size of your bundles across pull requests. Define size budgets for your JavaScript assets, and Bundlewatch reports any size regressions directly in your pull requests as a comment. This process keeps your team informed about bundle size changes, ensuring optimal performance and preventing performance degradation due to oversized bundles. It's ideal for modern web development workflows.