Do this before upgrading to React 19

Image by Author. React 19 community.

For those who are non medium members: this article talks about CoverItUp — All in one code coverage tool

As developers, we’re constantly on the lookout for ways to optimize our applications, aiming for faster load times and a smoother user experience.

One crucial aspect of optimization is managing our bundle size. At the same time, we also care about the build time.

With the release of React 19, many of us will consider the upgrade from React 18 and wondering — What impact will this have on our bundle size?

Or do the improvements bring changes to my developer workflow, such as npm buildtime or install or bundle sizes.

Bundle size matters!

It directly affects the performance of your web application, influencing loading times, interactivity, and ultimately, user satisfaction. As React evolves, each new version brings optimizations, features, and sometimes changes that can affect the size of your final bundle.

When upgrading from React 18 to React 19, it’s essential to not only focus on the new features and improvements, but also to keep a close eye on how these changes impact your bundle size.

For a brand new project, starting with the latest version of React is a no-brainer. However, for existing…