18 min read

JavaScript , Coding , Techniques

The gap between “you need a library for this” and “the browser does this” keeps closing. A practical guide to auditing your dependencies and finding what the web platform can now handle for you.

Most of us install a dependency once and never look at it again. It does its job, the tests pass, and we move on. But the web platform keeps moving too, and a surprising number of the libraries sitting in your package.json today are now built into the browser.

In a typical mid-sized JavaScript app, you can often find somewhere between 60KB and 90KB (minified and gzipped) of dependencies that the platform can now handle on its own. Date and number formatting, HTTP requests, modals, tooltips, deep cloning, grouping arrays: these were all real gaps a few years ago. A lot of them aren’t gaps anymore.

The reason those libraries stick around isn’t laziness.…