prosdevlab

SDK Kit

stable
sdk
Updated 1/3/2026

A composable, plugin-based architecture for building type-safe, tree-shakeable JavaScript SDKs by Lytics.

Documentation

Overview

SDK Kit provides a blueprint for building JavaScript SDKs with a composable, plugin-based architecture. Built with TypeScript and designed for modern development workflows, it offers the flexibility of a minimal core with the power of capability-based plugins.

Latest Release: v0.1.0 — Core framework and 6 essential plugins ready for production use.

Why SDK Kit?

Building a JavaScript SDK from scratch is challenging. SDK Kit gives you a proven blueprint:

  • Functional Plugins - Pure functions with explicit dependencies, no classes or hidden state
  • Event-Driven Coordination - Plugins communicate through events with wildcard patterns
  • Type-Safe - Full TypeScript support throughout
  • Tree-Shakeable - Users only bundle what they use
  • Battle-Tested Patterns - Architecture proven in production SDKs

Installation

npm install @lytics/sdk-kit @lytics/sdk-kit-plugins

Quick Start

import { SDK } from '@lytics/sdk-kit'
import { storagePlugin, contextPlugin, transportPlugin } from '@lytics/sdk-kit-plugins'
 
// Build your SDK from composable plugins
const mySDK = new SDK()
mySDK.use(storagePlugin)
mySDK.use(contextPlugin)
mySDK.use(transportPlugin)
 
await mySDK.init({
  storage: { namespace: 'mycompany' },
  transport: { endpoint: 'https://api.mycompany.com' }
})
 
// Your SDK is ready to use
mySDK.storage.set('userId', '123')
const context = mySDK.context.get()
 
await mySDK.transport.send({
  event: 'pageview',
  context
})

Core Features

Core Framework:

  • Plugin system with 5 capabilities (Emitter, Config, Namespace, Expose, Requirer)
  • 550+ tests with 98%+ coverage
  • Full TypeScript support

Essential Plugins:

  • Storage - localStorage/sessionStorage/cookies/memory
  • Context - Browser/device detection
  • Poll - Async resource polling
  • Queue - Batching & persistence
  • Transport - Fetch/beacon/pixel/XHR
  • Consent - OneTrust/CookieBot integration

Use Cases

  • Building client libraries for APIs
  • Creating browser SDKs for products
  • Learning modern SDK architecture patterns
  • Shipping production-ready developer tools

Resources