# github/catalyst

Catalyst is a set of patterns and techniques for developing components within a complex application.

Repository: https://github.com/github/catalyst
Canonical: https://ross.abutalabs.com/products/github-catalyst
Homepage: https://github.github.io/catalyst/
Language: TypeScript
License: MIT
License Family: permissive
Last push: 2026-08-10T21:35:41+00:00

## Health v2 (maintenance only)
Score: 80/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 48, longevity 100
- inputs: {"age_days": 2394, "days_push": 23, "days_rel": 135, "gap_med": 271.0, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1432, forks 59 (observed 2026-08-28T04:04:43.116955+00:00)

## What it is
Catalyst is a small TypeScript library from GitHub that simplifies building Web Components using decorators, targets, and data-action bindings. It provides patterns and helpers for structuring components within complex applications.

## Use cases
- build custom elements with less boilerplate
- use decorators with web components
- bind DOM events to component methods
- manage element targets in web components
- structure frontend components in a large app

## When to choose
- you want lightweight Web Components without a full framework
- you like Stimulus-style declarative bindings
- your stack is TypeScript and standards-based DOM

## When to avoid
- you need a full reactive UI framework with state management
- you don't use TypeScript or decorators
- you need server-side rendering out of the box

## Facets
- artifact type: library
- maturity: maintenance
- function: ui-components, frontend-framework
- domain: web-development, frontend
- platform: browser
- tags: web-server, typescript

## Member repositories
- github/catalyst (main) score 80

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:43.116955+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:37:01.545744+00:00, confidence not recorded.
  - readme: https://github.com/github/catalyst (fetched 2026-08-28T04:04:43.116955+00:00, sha ff0de45f18a0)
  - homepage: https://github.github.io/catalyst/ (fetched 2026-08-29T11:48:36.798619+00:00, sha a6d9a68eb89e)
- Data as of 2026-08-30T08:39:29.467469+00:00.