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cem
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cem

Active·★ 47·GPL-3.0·Updated 2026-10-22

`cem` is a versatile command-line tool designed to generate, query, and manage Custom Elements Manifest files, facilitating rich metadata for web components. It offers advanced features like a Language Server Protocol (LSP) for intelligent IDE support, a development server with live reload, and an AI-native Model Context Protocol (MCP) for component understanding and HTML generation.

#Custom Elements Manifest#Web Components#CLI Tool#Language Server Protocol#Development Server#AI Integration
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Guides
#Code Generation
#Metadata Management
$ Install
$ npm install --save-dev @pwrs/cem
↗ Visit site★ GitHub
01

Features

01Generate Custom Elements Manifest from code.
02Serve a development environment with live reload and interactive testing for custom elements.
03Provide intelligent IDE features through Language Server Protocol (LSP).
04Offer AI-native access to custom element data via Model Context Protocol (MCP).
02

Compatibility

Node.js
Runtime
Verified via docs
TypeScript
Language
Verified via docs
Linux
OS
Verified via docs
03

Quick start

1
$ npm install --save-dev @pwrs/cem
04

Use cases

↳Streamlining the development and testing of web components with live reload and interactive property controls.
↳Improving developer experience in IDEs with intelligent code completion, error detection, and documentation for custom elements.
↳Integrating AI assistants for automated HTML generation and ensuring design system compliance based on component manifests.
05

Alternatives

⚡Top VS:
VSdocs-mcp★125→VSRoslynMcpServer★31→VSkaydet★51→VS

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bennypowers /
cem
↗

The standards-based Web Components multitool. Generate Custom Elements Manifests, Dev Server, LSP, and MCP for your app or design system

47GPL-3.0
Last commit1d ago
StatusActive
CategoryCode Assistant
Links
Documentation↗Discussion↗Issues↗Releases↗
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