Jest ESM — Total Guide To More Than 100% Faster Testing For Angular⚡

Tomas Trajan
15 min readJan 10

Let’s learn how to speed up our Angular Jest tests by more than 100% by switching to Jest ESM (a notoriously problematic migration) and how to solve all the troublesome issues that tend to pop up along the way!

Idea, Prompts, Composition & Design by Tomas Trajan, Gen by MindJourney

In my case, the final speed up was close to 290% from 50 seconds to only 17 seconds which is a huge win!

Tomas Trajan

👋 I build, teach, write & speak about #Angular & #NgRx for enterprises 👨‍💻 Google Developer Expert #GDE 👨‍🏫 @AngularZurich meetup co-organizer