jest Agent Skills & AI Rules

---
id: architecture
title: Architecture
---

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If you are interested in learning more about how Jest works, understand its architecture, and how Jest is split up into individual reusable packages, check out this video:

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If you'd like to learn how to build a testing framework like Jest from scratch, check out this video:

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There is also a [written guide you can follow](https://cpojer.net/posts/building-a-javascript-testing-framework). It teaches the fundamental concepts of Jest and explains how various parts of Jest can be used to compose a custom testing framework.