The Coverage class in Puppeteer can help you automate the process of detecting unused code and extracting used code. The Coverage tab in Chrome DevTools can give you a line-by-line breakdown of unused code. How to remove unused JavaScript # Detect unused JavaScript # See the Lighthouse performance scoring post to learn how your page's overall performance score is calculated. Lighthouse flags every JavaScript file with more than 20 kibibytes of unused code: Click a value in the URL column to open the script's source code in a new tab. ![]() Sending unused code over the network is also wasteful for mobile users who don't have unlimited data plans. ![]() not render-blocking), the code competes for bandwidth with other resources while it's downloading, which has significant performance implications. Even if the JavaScript is asynchronous (i.e. ![]() ![]() If the JavaScript is render-blocking, the browser must download, parse, compile, and evaluate the script before it can proceed with all of the other work that's needed for rendering the page.Unused JavaScript can slow down your page load speed: Build tool for support for removing unused code.
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