In the 2000s, when I was a teenager building web apps and browser games, I built most things from scratch with PHP and JavaScript. One reason was that I didn’t want to use any framework or library I didn’t understand, and the other reason was that things I didn’t understand felt like magic. I have since resigned to the fact that I cannot possibly understand every system.

However, I spent time understanding two systems deeply: JavaScript test frameworks and bundlers. Next to compilers and type-checkers, they are among the fundamental tools that make Front End Developers effective, yet people rarely have time to learn how these tools work. This companion podcast will give you background knowledge on Jest.

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