Beacon

Reactive dependency graph runtime for Node.js backends. Tracks dependencies between signals and propagates updates automatically.

Tracks which properties each effect reads and re-runs only when those properties change. Zero dependencies, TypeScript-first.

Installation

npm install @nerdalytics/beacon --save-exact
# or
yarn add @nerdalytics/beacon
# or
pnpm add @nerdalytics/beacon
# or
bun add @nerdalytics/beacon
# or
deno install npm:@nerdalytics/beacon
# or
npx jsr add @nerdalytics/beacon
# or
vlt install @nerdalytics/beacon

Quick Start

import { state, derive, effect } from '@nerdalytics/beacon';

const signal = state({ count: 0 });
const doubled = derive(() => signal.count * 2);

const dispose = effect(() => {
  console.log(`Count: ${signal.count}, Doubled: ${doubled.value}`);
});
// => "Count: 0, Doubled: 0"

signal.count = 5;
// => "Count: 5, Doubled: 10"

dispose();
doubled.reactive = false;

Documentation

Full documentation, API reference, and examples available at: nerdalytics.github.io/beacon

LLM-friendly docs

The handbook has plain-text endpoints for LLMs:

• llms.txt lists available versions
• <version>/llms.txt lists pages for a version
• <version>/llms-full.txt concatenates every page into one file

You can also append .md to any handbook page URL for its Markdown source (e.g. <version>/introduction.md).

License

MIT - See LICENSE for details.