The big JavaScript bundle is a common performance problem in Frontend development. Nobody likes slow, heavy applications and looking at the loading spinner.

The utility libraries (collections of functions implementing common tasks like finding unique items of an array, formatting dates, etc.) impact heavily the bundle size. Examples of utility libraries in JavaScript are Lodash, Ramda, Date-fns, Math.js.

Let’s discuss when it makes sense to use utility libraries. And importantly, how to integrate libraries to minimally affect the bundle size.

#javascript