Introduction

Welcome to Building with LARC: A Reference Manual, your comprehensive guide to the Lightweight Asynchronous Relay Core framework. If you're holding this book (or reading it on a screen, as modern humans do), you're about to dive into one of the most refreshingly simple yet surprisingly powerful approaches to building web applications. No, we're not overselling it. Well, maybe a little. But stick with us.

What Is LARC?

LARC (Lightweight Asynchronous Relay Core) is a zero-build, browser-native web component framework built around a message-passing architecture called PAN (Page Area Network). If that sentence made you think "Wait, another JavaScript framework?" — we get it. But LARC is different in ways that matter.

Here's the elevator pitch: LARC gives you the power of modern component-based architecture without requiring build tools, dependency hell, or sacrificing your weekend to webpack configuration. It's built entirely on web standards (Custom Elements, Shadow DOM, ES Modules), uses a DOM-native pub/sub messaging system to coordinate components, and can be added to any project with a single